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--- networking:atm_glossary [15/01/2025 13:12] – andrew
+++ networking:atm_glossary [24/01/2025 01:50] (current) – [Jitter] andrew
@@ Line 69: / Line 69: @@
 custom interfaces with FORE products.
-APP (application program) - a complete, self-contained program that performs a specific
+===== APP (application program) =====
+ - a complete, self-contained program that performs a specific
 function directly for the user.
-AppleTalk - a networking protocol developed by Apple Computer for communication
+===== AppleTalk =====
+ - a networking protocol developed by Apple Computer for communication
 between Apple’s products and other computers. Independent of the network layer, AppleTalk
 runs on LocalTalk, EtherTalk and TokenTalk.
-ARP (Address Resolution Protocol) - a method used to resolve higher level protocol
+===== ARP (Address Resolution Protocol) =====
+ - a method used to resolve higher level protocol
 addressing (such as IP) into the appropriate header data required for ATM; i.e., port, VPI, and
 VCI; also defines the AAL type to be used.
-ASCII (American Standard Code for Information Interchange) - a standard character set
+===== ASCII (American Standard Code for Information Interchange) =====
-that (typically) assigns a 7-bit sequence to each letter, number, and selected control characters.
+ - a standard character set that (typically) assigns a 7-bit sequence to each letter, number, and selected control characters.
-Assigned Cell - a cell that provides a service to an upper layer entity or ATM Layer Manage-
+===== Assigned Cell =====
+ - a cell that provides a service to an upper layer entity or ATM Layer Manage-
 ment entity (ATMM-entity).
-asxmon - a FORE program that repeatedly displays the state of the switch and of all its active
+===== asxmon =====
+ - a FORE program that repeatedly displays the state of the switch and of all its active
 ports.
-ATDM (Asynchronous Time Division Multiplexing) - a method of sending information that
+===== ATDM (Asynchronous Time Division Multiplexing) =====
+ - a method of sending information that
 resembles normal TDM, except that time slots are allocated as needed rather than preassigned
 to specific transmitters.
-ATM (Asynchronous Transfer Mode) - a transfer mode in which the information is organized
+===== ATM (Asynchronous Transfer Mode) =====
+ - a transfer mode in which the information is organized
 into cells. It is asynchronous in the sense that the recurrence of cells containing information
 from an individual user is not necessarily periodic.
-ATM Forum - an international non-profit organization formed with the objective of accelerat-
+===== ATM Forum =====
+ - an international non-profit organization formed with the objective of accelerat-
 ing the use of ATM products and services through a rapid convergence of interoperability
 specifications. In addition, the Forum promotes industry cooperation and awareness.
-ATM Layer link - a section of an ATM Layer connection between two adjacent active ATM
+===== ATM Layer link =====
+ - a section of an ATM Layer connection between two adjacent active ATM
 Layer entities (ATM-entities).
-ATM Link - a virtual path link (VPL) or a virtual channel link (VCL).
+===== ATM Link =====
+ - a virtual path link (VPL) or a virtual channel link (VCL).
-ATM Peer-to-Peer Connection - a virtual channel connection (VCC) or a virtual path connec-
+===== ATM Peer-to-Peer Connection =====
+ - a virtual channel connection (VCC) or a virtual path connec-
 tion (VPC) directly established, such as workstation-to-workstation. This setup is not com-
 monly used in networks.
-ATM Traffic Descriptor - a generic list of parameters that can be used to capture the intrinsic
+===== ATM Traffic Descriptor =====
+ - a generic list of parameters that can be used to capture the intrinsic
 traffic characteristics of a requested ATM connection.
-ATM User-to-User Connection - an association established by the ATM Layer to support
+===== ATM User-to-User Connection =====
+ - an association established by the ATM Layer to support
 communication between two or more ATM service users (i.e., between two or more next
 higher layer entities or between two or more ATM entities). The communication over an ATM
@@ Line 118: / Line 132: @@
 Identifier (VCI) is used for both directions of a connection at an interface.
-atmarp - a FORE program that shows and manipulates ATM ARP entries maintained by the
+===== atmarp =====
+ - a FORE program that shows and manipulates ATM ARP entries maintained by the
 given device driver. This is also used to establish PVC connections.
-atmconfig - a FORE program used to enable or disable SPANS signalling.
+===== atmconfig =====
+ - a FORE program used to enable or disable SPANS signalling.
-atmstat - a FORE program that shows statistics gathered about a given adapter card by the
+===== atmstat =====
+ - a FORE program that shows statistics gathered about a given adapter card by the
 device driver. These statistics include ATM layer and ATM adaptation layer cell and error
 counts. This can also be used to query other hosts via SNMP.
-AUI (Attachment User Interface) - IEEE 802.3 interface between a media attachment unit
+===== AUI (Attachment User Interface) =====
+ - IEEE 802.3 interface between a media attachment unit
 (MAU) and a network interface card (NIC). The term AUI can also refer to the rear panel port
 to which an AUI cable might attach.
-Auto-logout - a feature that automatically logs out a user if there has been no user interface
+===== Auto-logout =====
+ - a feature that automatically logs out a user if there has been no user interface
 activity for a specified length of time.
-B8ZS (Bipolar 8 Zero Substitution) - a line coding technique used to accommodate the ones
-density requirements of T1 facilities.
+===== B8ZS (Bipolar 8 Zero Substitution) =====
-Backbone - the main connectivity device of a distributed system. All systems that have con-
+ - a line coding technique used to accommodate the ones density requirements of T1 facilities.
+===== Backbone =====
+ - the main connectivity device of a distributed system. All systems that have con-
 nectivity to the backbone connect to each other. This does not stop systems from setting up
 private arrangements with each other to bypass the backbone for cost, performance, or secu-
 rity.
-Bandwidth - usually identifies the capacity or amount of data that can be sent through a given
-circuit; may be user-specified in a PVC.
+===== Bandwidth =====
-baud - unit of signalling speed. The speed in baud is the number of discrete conditions or sig-
+ - usually identifies the capacity or amount of data that can be sent through a given circuit; may be user-specified in a PVC.
+===== baud =====
+ - unit of signalling speed. The speed in baud is the number of discrete conditions or sig-
 nal events per second. If each signal event represents only one bit, the baud rate is the same as
 bps; if each signal event represents more than one bit (such as a dibit), the baud rate is smaller
 than bps.
-Glossary - 4
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual
+===== BECN (Backward Explicit Congestion Notification) =====
-Glossary
+ - bit set by a Frame Relay network in
-BECN (Backward Explicit Congestion Notification) - bit set by a Frame Relay network in
 frames traveling in the opposite direction of frames encountering a congested path. Data ter-
 minal equipment (DTE) receiving frames with the BECN bit set can request that higher-level
 protocols take flow control action as appropriate. Compare with FECN.
-BES (Bursty Errored Seconds) - a BES contains more than 1 and fewer than 320 path coding
+===== BES (Bursty Errored Seconds) =====
+ - a BES contains more than 1 and fewer than 320 path coding
 violation error events, and no severely errored frame or AIS defects. Controlled slips are not
 included in determining BESs.
-BGP (Border Gateway Protocol) - used by gateways in an internet connecting autonomous
+===== BGP (Border Gateway Protocol) =====
+ - used by gateways in an internet connecting autonomous
 networks. It is derived from experiences learned using the EGP.
-BIP (Bit Interleaved Parity) - an error-detection technique in which character bit patterns are
+===== BIP (Bit Interleaved Parity) =====
+ - an error-detection technique in which character bit patterns are
 forced into parity, so that the total number of one bits is always odd or always even. This is
 accomplished by the addition of a one or zero bit to each byte, as the byte is transmitted; at the
 other end of the transmission, the receiving device verifies the parity (odd or even) and the
 accuracy of the transmission.
-B-ISDN (Broadband Integrated Services Digital Network) - a common digital network suit-
-able for voice, video, and high-speed data services running at rates beginning at 155 Mbps.
+===== B-ISDN (Broadband Integrated Services Digital Network) =====
-BNC (Bayonet-Neill-Concelman) - a bayonet-locking connector for miniature coax.
+ - a common digital network suitable for voice, video, and high-speed data services running at rates beginning at 155 Mbps.
-BPDU (Bridged Protocol Data Unit) - Spanning-tree Protocol hello packet that is sent out at
+===== BNC (Bayonet-Neill-Concelman) =====
+ - a bayonet-locking connector for miniature coax.
+===== BPDU (Bridged Protocol Data Unit) =====
+ - Spanning-tree Protocol hello packet that is sent out at
 configurable intervals to exchange information among bridges in the network.
-bps (bits per second) - a measure of speed or data rate. Often combined with metric prefixes
+===== bps (bits per second) =====
+ - a measure of speed or data rate. Often combined with metric prefixes
 in kbps for thousands of bits per second (k fir kilo-) and in Mbps for millions of bits per sec-
 ond (M for mega-).
-BPV (Bipolar Violation) - an error event on a line in which the normal pattern of alternating
+===== BPV (Bipolar Violation) =====
+ - an error event on a line in which the normal pattern of alternating
 high (one) and low (zero) signals is disrupted. A bipolar violation is noted when two high sig-
 nals occur without an intervening low signal, or vice versa.
-Bridge - a device that expands a Local Area Network by forwarding frames between data link
+===== Bridge =====
+ - a device that expands a Local Area Network by forwarding frames between data link
 layers associated with two separate cables, usually carrying a common protocol. Bridges can
 usually be made to filter certain packets (to forward only certain traffic).
-Broadband - a service or system requiring transmission channels capable of supporting rates
+===== Broadband =====
+ - a service or system requiring transmission channels capable of supporting rates
 greater than the Integrated Services Digital Network (ISDN) primary rate.
-Broadband Access - an ISDN access capable of supporting one or more broadband services.
+===== Broadband Access =====
+ - an ISDN access capable of supporting one or more broadband services.
 Brouter (bridging/router) - a device that routes some protocols and bridges others based on
 configuration information.
-Bursty Second - a second during which there were at least the set number of BES threshold
+===== Bursty Second =====
+ - a second during which there were at least the set number of BES threshold
 event errors but fewer than the set number of SES threshold event errors.
-BUS (Broadcast and Unknown Server) - in an emulated LAN, the BUS is responsible for
+===== BUS (Broadcast and Unknown Server) =====
-accepting broadcast, multicast, and unknown unicast packets from the LECs to the broadcast
+ - in an emulated LAN, the BUS is responsible for accepting broadcast, multicast, and unknown unicast packets from the LECs to the broadcast MAC address (FFFFFFFFFFFF) via dedicated point-to-point connections, and forwarding the
-MAC address (FFFFFFFFFFFF) via dedicated point-to-point connections, and forwarding the
 packets to all of the members of the ELAN using a single point-to-multipoint connection.
-CAC (Connection Admission Control) - the procedure used to decide if a request for an
+===== CAC (Connection Admission Control) =====
+ - the procedure used to decide if a request for an
 ATM connection can be accepted based on the attributes of both the requested connection and
 the existing connections.
-Call - an association between two or more users or between a user and a network entity that is
+===== Call =====
+ - an association between two or more users or between a user and a network entity that is
 established by the use of network capabilities. This association may have zero or more connec-
 tions.
-Carrier - a company, such as any of the “baby Bell” companies, that provide network commu-
-nications services, either within a local area or between local areas.
+===== Carrier =====
-CBR (Constant Bit Rate) - a type of traffic that requires a continuous, specific amount of
+ - a company, such as any of the “baby Bell” companies, that provide network communications services, either within a local area or between local areas.
+===== CBR (Constant Bit Rate) =====
+ - a type of traffic that requires a continuous, specific amount of
 bandwidth over the ATM network (e.g., digital information such as video and digitized
 voice).
-CBR port - a port on the CellPath 300 for transmitting and receiving CBR traffic.
+===== CBR port =====
+ - a port on the CellPath 300 for transmitting and receiving CBR traffic.
 cchan - a FORE program used to manage virtual channels on a FORE Systems ATM switch
 running asxd.
-CCITT (Consultative Committee for International Telephone and Telegraph) - an interna-
-tional consultative committee that sets international communications recommendations,
+===== CCITT (Consultative Committee for International Telephone and Telegraph) =====
-which are frequently adopted as standards; develops interface, modem, and data network rec-
+ - an international consultative committee that sets international communications recommendations,
-ommendations. Membership includes PTTs, scientific and trade associations, and private com-
+which are frequently adopted as standards; develops interface, modem, and data network recommendations. Membership includes PTTs, scientific and trade associations, and private companies. CCITT is part of the International Communications Union (a United nations treaty organization in Geneva).
-panies. CCITT is part of the International Communications Union (a United nations treaty
-organization in Geneva).
+===== CDV (Cell Delay Variation) =====
-CDV (Cell Delay Variation) - a quantification of cell clumping for a connection. The cell
+ - a quantification of cell clumping for a connection. The cell
 clumping CDV (yk) is defined as the difference between a cell’s expected reference arrival
 time (ck) and its actual arrival time (ak). The expected reference arrival time (ck) of cell k of a
 specific connection is max . T is the reciprocal of the negotiated peak cell rate.
-CE (Connection Endpoint) - a terminator at one end of a layer connection within a SAP.
-CEI (Connection Endpoint Identifier) - an identifier of a CE that can be used to identify the
+===== CE (Connection Endpoint) =====
+ - a terminator at one end of a layer connection within a SAP.
+===== CEI (Connection Endpoint Identifier) =====
+ - an identifier of a CE that can be used to identify the
 connection at a SAP.
-Cell - an ATM Layer protocol data unit (PDU). The basic unit of information transported in
+===== Cell =====
+ - an ATM Layer protocol data unit (PDU). The basic unit of information transported in
 ATM technology, each 53-byte cell contains a 5-byte header and a 48-byte payload.
-Cell Delineation - the protocol for recognizing the beginning and end of ATM cells within the
+===== Cell Delineation =====
+ - the protocol for recognizing the beginning and end of ATM cells within the
 raw serial bit stream.
-Cell Header - ATM Layer protocol control information.
-c k 1–{ } T a k,+[ ]
+===== Cell Header =====
-Glossary - 6
+ - ATM Layer protocol control information.
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual
-Glossary
+===== Cell Port =====
-Cell Port - a port on the CellPath 300 that transmits and receives traffic in cell format.
+ - a port on the CellPath 300 that transmits and receives traffic in cell format.
-Cell Rate Adaptation - a function performed by a protocol module in which empty cells
+===== Cell Rate Adaptation =====
+ - a function performed by a protocol module in which empty cells
 (known as unassigned cells) are added to the output stream. This is because there always must
 be a fixed number of cells in the output direction; when there are not enough cells to transmit,
 unassigned cells are added to the output data stream.
-Cell Transfer Delay - the transit delay of an ATM cell successfully passed between two desig-
+===== Cell Transfer Delay =====
+ - the transit delay of an ATM cell successfully passed between two desig-
 nated boundaries.
-CES (Circuit emulation Services) - The CellPath 90 supports Circuit Emulation Services
+===== CES (Circuit emulation Services) =====
+ - The CellPath 90 supports Circuit Emulation Services
 (CES) for applications requiring a fixed delay, lossless end-to-end connection through the net-
 work. In essence, CES provides a virtual private line service to the connecting application.
 Channelization - capability of transmitting independent signals together over a cable while
 still maintaining their separate identity for later separation.
-CLP (Cell Loss Priority) - the last bit of byte four in an ATM cell header; indicates the eligibil-
+===== CLP (Cell Loss Priority) =====
+ - the last bit of byte four in an ATM cell header; indicates the eligibil-
 ity of the cell for discard by the network under congested conditions. If the bit is set to 1, the
 cell may be discarded by the network depending on traffic conditions.
-Cold Start Trap - a CellPath 300 SNMP trap which is sent when the unit has been power-
+===== Cold Start Trap =====
+ - a CellPath 300 SNMP trap which is sent when the unit has been power-
 cycled (see trap).
-Comm Port - the front panel DCE port that allows access to the CellPath 300 user interface via
+===== Comm Port =====
+ - the front panel DCE port that allows access to the CellPath 300 user interface via
 a connected terminal.
-Concentrator - a communications device that offers the ability to concentrate many lower-
+===== Concentrator =====
+ - a communications device that offers the ability to concentrate many lower-
 speed channels into and out of one or more high-speed channels.
-Congestion Management - a CellPath 300 feature that helps ensure reasonable service for
+===== Congestion Management =====
+ - a CellPath 300 feature that helps ensure reasonable service for
 VBR connections in an ATM network. For each connection, the CellPath 300 maintains a prior-
 ity, sustained cell rate (SCR), and peak cell rate (PCR). During times of congestion, the CellPath
 reduces the bandwidth to the SCR, based on the priority of the connection.
-Connection - the concatenation of ATM Layer links in order to provide an end-to-end infor-
+===== Connection =====
+ - the concatenation of ATM Layer links in order to provide an end-to-end infor-
 mation transfer capability to access points.
-Connectionless Service - a type of service in which no pre-determined path or link has been
+===== Connectionless Service =====
+ - a type of service in which no pre-determined path or link has been
 established for transfer of information, supported by AAL 4.
-Connection-Oriented Service - a type of service in which information always traverses the
+===== Connection-Oriented Service =====
+ - a type of service in which information always traverses the
 same pre-established path or link between two points, supported by AAL 3.
-Controlled Slip - a situation in which one frame’s worth of data is either lost or replicated. A
+===== Controlled Slip =====
+ - a situation in which one frame’s worth of data is either lost or replicated. A
 controlled slip typically occurs when the sending device and receiving device are not using
 the same clock.
-Corresponding Entities - peer entities with a lower layer connection among them
+===== Corresponding Entities =====
+ - peer entities with a lower layer connection among them
+===== cpath =====
+ - a FORE program used to manage virtual paths on a FORE Systems ATM switch running asxd.
-cpath - a FORE program used to manage virtual paths on a FORE Systems ATM switch run-
+===== CPE (Customer Premise Equipment) =====
-ning asxd.
+ - equipment that is on the customer side of the point of
-CPE (Customer Premise Equipment) - equipment that is on the customer side of the point of
 demarcation, as opposed to equipment that is on a carrier side. See also point of demarcation.
 cport - a FORE program used to monitor and change the state of ports on a FORE Systems
 ATM switch running asxd.
-CRC (Cyclic Redundancy Check) - an error detection scheme in which a number is derived
+===== CRC (Cyclic Redundancy Check) =====
+ - an error detection scheme in which a number is derived
 from the data that will be transmitted. By recalculating the CRC at the remote end and com-
 paring it to the value originally transmitted, the receiving node can detect errors.
 Cross Connection - a mapping between two channels or paths at a network device such as
 the CellPath 300.
-CD (Controlled Slip) - a situation in which one frame’s worth of data is either lost or repli-
+===== CD (Controlled Slip) =====
+ - a situation in which one frame’s worth of data is either lost or repli-
 cated. A controlled slip typically occurs when the sending device and receiving device are not
 using the same clock.
-CS (Convergence Sublayer) - a portion of the AAL. Data is passed first to the CS where it is
+===== CS (Convergence Sublayer) =====
+ - a portion of the AAL. Data is passed first to the CS where it is
 divided into rational, fixed-length packets or PDUs (Protocol Data Units). For example, AAL 4
 processes user data into blocks that are a maximum of 64 kbytes long.
@@ Line 280: / Line 379: @@
 the DTE on pin 5) which indicates that the attached DTE may begin transmitting; issuance in
 response to the DTE’s RTS.
-D4 framing - See SF)
-DARPA (Defense Advanced Research Projects Agency) - the US government agency that
+===== D4 framing =====
-funded the ARPANET.
+ - See SF)
-Datagram - a packet of information used in a connectionless network service that is routed to
+===== DARPA (Defense Advanced Research Projects Agency) =====
+ - the US government agency that funded the ARPANET.
+===== Datagram =====
+ - a packet of information used in a connectionless network service that is routed to
 its destination using an address included in the datagram’s header.
 DCE (Data Communications Equipment) - a definition in the RS232C standard that
 describes the functions of the signals and the physical characteristics of an interface for a com-
 munication device such as a modem.
-DCS (Digital Cross-connect System) - an electronic patch panel used to route digital signals
-in a central office.
+===== DCS (Digital Cross-connect System) =====
-Demultiplexing - a function performed by a layer entity that identifies and separates SDUs
+ - an electronic patch panel used to route digital signals in a central office.
+===== Demultiplexing =====
+ - a function performed by a layer entity that identifies and separates SDUs
 from a single connection to more than one connection (see multiplexing).
 DFA (DXI Frame Address) - a connection identifier associated with ATM DXI packets that
 serves the same functions as, and translates directly to, the VPI/VCI on an ATM cell.
-Glossary - 8
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual
-Glossary
+===== DIP Switch (Dual In-line Package) =====
-DIP Switch (Dual In-line Package) - a device that has two parallel rows of contacts that let
+ - a device that has two parallel rows of contacts that let
 the user switch electrical current through a pair of those contacts to on or off. They are used to
 reconfigure components and peripherals.
 DLCI (Data Link Connection Identifier) - a connection identifier associated with frame relay
-packets that serves the same functions as, and translates directly to, the VPI/VCI on an ATM
+packets that serves the same functions as, and translates directly to, the VPI/VCI on an ATM cell.
-cell.
-Domain Name Server - a computer that converts names to their corresponding Internet num-
+===== Domain Name Server =====
+ - a computer that converts names to their corresponding Internet num-
 bers. It allows users to telnet or FTP to the name instead of the number.
-DNS (Domain Name System) - the distributed name and address mechanism used in the
-Internet.
+===== DNS (Domain Name System) =====
-DSn (Digital Standard n (0, 1, 1C, 2, and 3)) - a method defining the rate and format of digi-
+ - the distributed name and address mechanism used in the Internet.
-tal hierarchy, with asynchronous data rates defined as follows:
-DS0 64kbps 1 voice channel
+===== DSn (Digital Standard n (0, 1, 1C, 2, and 3)) =====
-DS1 1.544Mbps 24 DS0s
+ - a method defining the rate and format of digital hierarchy, with asynchronous data rates defined as follows:
-DS1C 3.152 Mbps 2 DS1s
+  - DS0 64kbps 1 voice channel
-DS2 6.312 Mbps 4 DS1s
+  - DS1 1.544Mbps 24 DS0s
-DS3 44.736 Mbps 28 DS1s
+  - DS1C 3.152 Mbps 2 DS1s
-Synchronous data rates (SONET) are defined as:
+  - DS2 6.312 Mbps 4 DS1s
-STS-1/OC-1 51.84 Mbps 28 DS1s or 1 DS3
+  - DS3 44.736 Mbps 28 DS1s
-STS-3/OC-3 155.52 Mbps 3 STS-1s byte interleaved
-STS-3c/OC-3c 155.52 Mbps Concatenated, indivisible payload
+    Synchronous data rates (SONET) are defined as:
-STS-12/OC-12 622.08 Mbps 12 STS-1s, 4 STS-3cs, or any mixture
+  - STS-1/OC-1 51.84 Mbps 28 DS1s or 1 DS3
-STS-12c/OC-12c 622.08 Mbps Concatenated, indivisible payload
+  - STS-3/OC-3 155.52 Mbps 3 STS-1s byte interleaved
-STS-48/OC-48 2488.32 Mbps 48 STS-1s, 16 STS-3cs, or any mixture
+  - STS-3c/OC-3c 155.52 Mbps Concatenated, indivisible payload
-DSR (Data Set Ready) - an RS-232 modem interface control signal (sent from the modem to
+  - STS-12/OC-12 622.08 Mbps 12 STS-1s, 4 STS-3cs, or any mixture
-the DTE on pin 6) which indicates that the modem is connected to the telephone circuit. Usu-
+  - STS-12c/OC-12c 622.08 Mbps Concatenated, indivisible payload
-ally a prerequisite to the DTE issuing RTS.
+  - STS-48/OC-48 2488.32 Mbps 48 STS-1s, 16 STS-3cs, or any mixture
-DTE (Data Terminal Equipment) - generally user devices, such as terminals and computers,
+===== DSR (Data Set Ready) =====
+ - an RS-232 modem interface control signal (sent from the modem to
+the DTE on pin 6) which indicates that the modem is connected to the telephone circuit. Usually a prerequisite to the DTE issuing RTS.
+===== DTE (Data Terminal Equipment) =====
+ - generally user devices, such as terminals and computers,
 that connect to data circuit-terminating equipment. They either generate or receive the data
 carried by the network.
-DTR (Data Terminal Ready) - an RS232 modem interface control signal (sent from the DTE to
+===== DTR (Data Terminal Ready) =====
+ - an RS232 modem interface control signal (sent from the DTE to
 the modem on pin 20) which indicates that the DTE is ready for data transmission and which
 requests that the modem be connected to the telephone circuit.
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual Glossary - 9
-Glossary
+===== DXI =====
-Glossary
+ - a generic phrase used in the full names of several protocols, all commonly used to allow
-DXI - a generic phrase used in the full names of several protocols, all commonly used to allow
 a pair of DCE and DTE devices to share the implementation of a particular WAN protocol. The
 protocols all define the packet formats used to transport data packets between DCE and DTE
 devices.
-E1 - Wide-area digital transmission scheme used predominantly in Europe that carries data at
+===== E1 =====
+ - Wide-area digital transmission scheme used predominantly in Europe that carries data at
 a rate of 2.048 Mbps. E1 lines can be leased for private use from common carriers.
-E3 - Wide-area digital transmission scheme used predominantly in Europe that carries data at
+===== E3 =====
+ - Wide-area digital transmission scheme used predominantly in Europe that carries data at
 a rate of 34.368 Mbps. E3 lines can be leased for private use from common carriers.
-EEPROM (Electrically Erasable Programmable Read Only Memory) - an EPROM that can
-be cleared with electrical signals rather than the traditional ultraviolet light.
+===== EEPROM (Electrically Erasable Programmable Read Only Memory) =====
-EFCI (Explicit Forward Congestion Indication) - the second bit of the payload type field in
+ - an EPROM that can be cleared with electrical signals rather than the traditional ultraviolet light.
-the header of an ATM cell, the EFCI bit indicates network congestion to receiving hosts. On a
-congested switch, the EFCI bit is set to “1” by the transmitting network module when a certain
+===== EFCI (Explicit Forward Congestion Indication) =====
-number of cells have accumulated in the network module’s shared memory buffer. When a
+ - the second bit of the payload type field in the header of an ATM cell, the EFCI bit indicates network congestion to receiving hosts. On a congested switch, the EFCI bit is set to “1” by the transmitting network module when a certain number of cells have accumulated in the network module’s shared memory buffer. When a cell is received that has its EFCI bit set to “1,” the receiving host notifies the sending host, which should then reduce its transmission rate.
-cell is received that has its EFCI bit set to “1,” the receiving host notifies the sending host,
-which should then reduce its transmission rate.
+===== EGP (Exterior Gateway) Protocol =====
-EGP (Exterior Gateway) Protocol - used by gateways in an internet, connecting autonomous
+ - used by gateways in an internet, connecting autonomous networks.
-networks.
-EIA (Electronics Industries Association) - a USA trade organization that issues its own
+===== EIA (Electronics Industries Association) =====
+ - a USA trade organization that issues its own
 standards and contributes to ANSI; developed RS-232. Membership includes USA manufac-
 turers.
-EISA (Extended Industry Standard Architecture) - a bus architecture for desktop computers
+===== EISA (Extended Industry Standard Architecture) =====
+ - a bus architecture for desktop computers
 that provides a 32-bit data passage while maintaining compatibility with the ISA or AT archi-
 tecture.
-elarp - a FORE program that shows and manipulates MAC and ATM address mappings for
-LAN Emulation Clients (LECs).
+===== elarp =====
-elconfig - a FORE program that shows and modifies LEC configuration. Allows the user to set
+ - a FORE program that shows and manipulates MAC and ATM address mappings for LAN Emulation Clients (LECs).
+===== elconfig =====
+ - a FORE program that shows and modifies LEC configuration. Allows the user to set
 the NSAP address of the LAN Emulation Configuration Server (LECS), display the list of
 Emulated LANs (ELANs) configured in the LECS for this host, display the list of ELANs
 locally configured along with the membership state of each, and locally administer ELAN
 membership.
-EM - the CellPath 300 extension module; paired with the system controller and supporting an
+===== EM =====
+ - the CellPath 300 extension module; paired with the system controller and supporting an
 optional PCMCIA card.
-Embedded SNMP Agent - an SNMP agent can come in two forms: embedded or proxy. An
+===== Embedded SNMP Agent =====
+ - an SNMP agent can come in two forms: embedded or proxy. An
 embedded SNMP agent is integrated into the physical hardware and software of the unit. The
 CellPath 300 has an internal, integrated SNMP agent.
-Glossary - 10
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual
+===== EMI (Electromagnetic Interference) =====
-Glossary
+ - signals generated and radiated by an electronic device
-EMI (Electromagnetic Interference) - signals generated and radiated by an electronic device
 that cause interference with radio communications, among other effects.
 End-to-End Connection - when used in reference to an ATM network, a connection that trav-
 els through an ATM network, passing through various ATM devices and with endpoints at the
 termination of the ATM network.
-EPROM - Erasable Programmable Read Only Memory (see PROM).
-EQL (Equalization) - the process of compensating for line distortions.
+===== EPROM =====
-ES (End System) - a system in which an ATM connection is terminated or initiated. An origi-
+ - Erasable Programmable Read Only Memory (see PROM).
+===== EQL (Equalization) =====
+ - the process of compensating for line distortions.
+===== ES (End System) =====
+ - a system in which an ATM connection is terminated or initiated. An origi-
 nating end system initiates the ATM connection, and a terminating end system terminates the
 ATM connection. OAM cells may be generated and received.
-ES (Errored Seconds) - a second during which at least one code violation occurred.
-ESF (Extended Superframe) - T1 framing standard that provides frame synchronization,
+===== ES (Errored Seconds) =====
-cyclic redundancy, and data link bits.
+ - a second during which at least one code violation occurred.
-Ethernet - a 10-Mbps, coaxial standard for LANs in which all nodes connect to the cable
+===== ESF (Extended Superframe) =====
+ - T1 framing standard that provides frame synchronization, cyclic redundancy, and data link bits.
+===== Ethernet =====
+ - a 10-Mbps, coaxial standard for LANs in which all nodes connect to the cable
 where they contend for access.
-Fairness - as related to Generic Flow Control (GFC), fairness is defined as meeting all of the
+===== Fairness =====
+ - as related to Generic Flow Control (GFC), fairness is defined as meeting all of the
 agreed quality of service (QoS) requirements by controlling the order of service for all active
 connections.
-Far-End - in a relationship between two devices in a circuit, the far-end device is the one that
+===== Far-End =====
+ - in a relationship between two devices in a circuit, the far-end device is the one that
 is remote.
-FCC - a board of commissioners appointed by the President under the Communications Act of
+===== FCC =====
+ - a board of commissioners appointed by the President under the Communications Act of
 , with the authority to regulate all interstate telecommunications originating in the United
 States, including transmission over phone lines.
-FDDI (Fiber Distributed Data Interface) - high-speed data network that uses fiber-optic as
+===== FDDI (Fiber Distributed Data Interface) =====
+ - high-speed data network that uses fiber-optic as
 the physical medium. Operates in similar manner to Ethernet or Token Ring, only faster.
-FDM (Frequency Division Multiplexing) - a method of dividing an available frequency range
+===== FDM (Frequency Division Multiplexing) =====
+ - a method of dividing an available frequency range
 into parts with each having enough bandwidth to carry one channel.
-FEBE (Far End Block Error) - an error detected by extracting the 4-bit FEBE field from the
+===== FEBE (Far End Block Error) =====
+ - an error detected by extracting the 4-bit FEBE field from the
 path status byte (G1). The legal range for the 4-bit field is between 0000 and 1000, representing
 zero to eight errors. Any other value is interpreted as zero errors.
-FECN (Forward Explicit Congestion Notification) - bit set by a Frame Relay network to
+===== FECN (Forward Explicit Congestion Notification) =====
+ - bit set by a Frame Relay network to
 inform data terminal equipment (DTE) receiving the frame that congestion was experienced in
 the path from source to destination. DTE receiving frames with the FECN bit set can request
 that higher-level protocols take flow control action as appropriate. Compare with BECN.
+===== FERF (Far End Receive Failure) =====
+ - a line error asserted when a 110 binary pattern is detected
+in bits 6, 7, 8 of the K2 byte for five consecutive frames. A line FERF is removed when any pattern other than 110 is detected in these bits for five consecutive frames.
+===== FIFO (First-In, First-Out) =====
+ - a method of coordinating the sequential flow of data through a buffer.
+===== Flag =====
+ - a specific bit pattern used to identify the beginning or end of a frame.
-FERF (Far End Receive Failure) - a line error asserted when a 110 binary pattern is detected
-in bits 6, 7, 8 of the K2 byte for five consecutive frames. A line FERF is removed when any pat-
-tern other than 110 is detected in these bits for five consecutive frames.
-FIFO (First-In, First-Out) - a method of coordinating the sequential flow of data through a
-buffer.
-Flag - a specific bit pattern used to identify the beginning or end of a frame.
 Frame - a variable length group of data bits with a specific format containing flags at the
 beginning and end to provide demarcation.
-Frame Relay - a fast packet switching protocol based on the LAPD protocol of ISDN that per-
+===== Frame Relay =====
+ - a fast packet switching protocol based on the LAPD protocol of ISDN that per-
 forms routing and transfer with less overhead processing than X.25.
-Frame Synchronization Error - an error in which one or more time slot framing bits are in
+===== Frame Synchronization Error =====
+ - an error in which one or more time slot framing bits are in
 error.
-Framing - a protocol that separates incoming bits into identifiable groups so that the receiving
+===== Framing =====
+ - a protocol that separates incoming bits into identifiable groups so that the receiving
 multiplexer recognizes the grouping.
-FT-PNNI (ForeThought PNNI) - a FORE Systems routing and signalling protocol that uses pri-
-vate ATM (NSAP) addresses; a precursor to ATM Forum PNNI (see PNNI).
+===== FT-PNNI (ForeThought PNNI) =====
-FTP (File Transfer Protocol) - a TCP/IP protocol that lets a user on one computer access, and
+ - a FORE Systems routing and signalling protocol that uses private ATM (NSAP) addresses; a precursor to ATM Forum PNNI (see PNNI).
+===== FTP (File Transfer Protocol) =====
+ - a TCP/IP protocol that lets a user on one computer access, and
 transfer data to and from, another computer over a network. ftp is usually the name of the
 program the user invokes to accomplish this task.
-GCRA (Generic Cell Rate Algorithm) - an algorithm which is employed in traffic policing
+===== GCRA (Generic Cell Rate Algorithm) =====
+ - an algorithm which is employed in traffic policing
 and is part of the user/network service contract. The GCRA is a scheduling algorithm which
 ensures that cells are marked as conforming when they arrive when expected or later than
 expected and non-conforming when they arrive sooner than expected.
-GFC (Generic Flow Control) - the first four bits of the first byte in an ATM cell header. Used
+===== GFC (Generic Flow Control) =====
+ - the first four bits of the first byte in an ATM cell header. Used
 to control the flow of traffic across the User-to-Network Interface (UNI), and thus into the net-
 work. Exact mechanisms for flow control are still under investigation and no explicit defini-
@@ Line 441: / Line 605: @@
 (between network nodes), these four bits provide additional network address capacity, and
 are appended to the VPI field.)
-GIO - a proprietary bus architecture used in certain Silicon Graphics, Inc. workstations.
-Header - protocol control information located at the beginning of a protocol data unit.
+===== GIO =====
-HDB3 (High Density Bipolar) - line-code type standard for T1 where each block of three zeros
+ - a proprietary bus architecture used in certain Silicon Graphics, Inc. workstations.
+===== Header =====
+ - protocol control information located at the beginning of a protocol data unit.
+===== HDB3 (High Density Bipolar) =====
+ - line-code type standard for T1 where each block of three zeros
 is replaced by 00V or B0V, where B represents an inserted pulse conforming to the AMI rule
 (ITU-T G.701, item 9004) and V represents an AMI violation (ITU-T G.701, item 9007). The
@@ Line 449: / Line 619: @@
 odd (successive V pulses are of alternate polarity so that no d.c. component is introduced).
 Compare with AMI.
-Glossary - 12
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual
-Glossary
+===== HDLC (High-Level Data Link Control) =====
-HDLC (High-Level Data Link Control) - Bit-oriented synchronous data link layer protocol
+ - Bit-oriented synchronous data link layer protocol
 developed by the ISO. Derived from SDLC, HDLC specifies a data encapsulation method on
 synchronous serial links using frame characters and checksums. See also SDLC.
-HEC (Header Error Control) - a CRC code located in the last byte of an ATM cell header that
+===== HEC (Header Error Control) =====
+ - a CRC code located in the last byte of an ATM cell header that
 is used for checking cell integrity only.
-HIPPI (High Performance Parallel Interface) - ANSI standard that extends the computer bus
+===== HIPPI (High Performance Parallel Interface) =====
+ - ANSI standard that extends the computer bus
 over fairly short distances at speeds of 800 and 1600 Mbps.
-HPUX - the Hewlett-Packard version of UNIX.
-HSSI (High-Speed Serial Interface) - a serial communications connection that operates at
+===== HPUX =====
+ - the Hewlett-Packard version of UNIX.
+===== HSSI (High-Speed Serial Interface) =====
+ - a serial communications connection that operates at
 speeds of up to 1.544 Mbps.
-Hub - a device that connects several other devices, usually in a star topology.
-I/O Module - FORE’s interface cards for the LAX-20 LAN Access Switch, designed to connect
+===== Hub =====
+ - a device that connects several other devices, usually in a star topology.
+===== I/O Module =====
+ - FORE’s interface cards for the LAX-20 LAN Access Switch, designed to connect
 Ethernet, Token Ring, and FDDI LANs to ForeRunner ATM networks.
-ICMP (Internet Control Message Protocol) - the protocol that handles errors and control
+===== ICMP (Internet Control Message Protocol) =====
+ - the protocol that handles errors and control
 messages at the IP layer. ICMP is actually a part of the IP protocol layer. It can generate error
 messages, test packets, and informational messages related to IP.
-IEEE (Institute of Electrical and Electronics Engineers) - the world’s largest technical pro-
+===== IEEE (Institute of Electrical and Electronics Engineers) =====
+ - the world’s largest technical pro-
 fessional society. Based in the U.S., the IEEE sponsors technical conferences, symposia & local
 meetings worldwide, publishes nearly 25% of the world’s technical papers in electrical, elec-
 tronics & computer engineering, provides educational programs for members, and promotes
 standardization.
 IETF (Internet Engineering Task Force) - a large, open, international community of network
 designers, operators, vendors and researchers whose purpose is to coordinate the operation,
-management and evolution of the Internet to resolve short- and mid-range protocol and archi-
+management and evolution of the Internet to resolve short- and mid-range protocol and architectural issues.
-tectural issues.
-ILMI (Interim Local Management Interface) - the standard that specifies the use of the Sim-
+===== ILMI (Interim Local Management Interface) =====
-ple Network Management Protocol (SNMP) and an ATM management information base
+ - the standard that specifies the use of the Simple Network Management Protocol (SNMP) and an ATM management information base (MIB) to provide network status and configuration information.
-(MIB) to provide network status and configuration information.
-Interface Data - the unit of information transferred to/from the upper layer in a single inter-
+===== Interface Data =====
+ - the unit of information transferred to/from the upper layer in a single inter-
 action across a SAP. Each Interface Data Unit (IDU) controls interface information and may
 also contain the whole or part of the SDU.
-internet - while an internet is a network, the term “internet” is usually used to refer to a collec-
+===== internet =====
+ - while an internet is a network, the term “internet” is usually used to refer to a collec-
 tion of networks interconnected with routers.
-Internet - (note the capital “I”) the largest internet in the world including large national back-
+===== Internet =====
+ - (note the capital “**I**”) the largest internet in the world including large national back-
 bone nets and many regional and local networks worldwide. The Internet uses the TCP/IP
 suite. Networks with only e-mail connectivity are not considered on the Internet.
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual Glossary - 13
-Glossary
+===== Internet Addresses =====
-Glossary
+ - the numbers used to identify hosts on an internet network.
-Internet Addresses - the numbers used to identify hosts on an internet network. Internet host
-numbers are divided into two parts; the first is the network number and the second, or local,
+Internet host numbers are divided into two parts; the first is the network number and the second, or local,
 part is a host number on that particular network. There are also three classes of networks in
 the Internet, based on the number of hosts on a given network. Large networks are classified
@@ Line 500: / Line 692: @@
 range 192-254 with a maximum of 254 hosts. Addresses are given as dotted decimal numbers
 in the following format:
 nnn.nnn.nnn.nnn
 In a Class A network, the first of the numbers is the network number, the last three numbers
 are the local host address.
 In a Class B network, the first two numbers are the network, the last two are the local host
 address.
 In a Class C network, the first three numbers are the network address, the last number is the
 local host address.
 The following table summarizes the classes and sizes:
-Class First # Max# Hosts
+^ Class ^ First ^ # Max# Hosts^
-A 1-126 16,387,064
+| A | 1-126 16,387,064|
-B 129-191 64,516
+| B | 129-191 64,516|
-C 192-223 254
+| C | 192-223 254|
 Network mask values are used to identify the network portion and the host portion of the
 address. For:
-Class A - the default mask is 255.0.0.0
+  - Class A - the default mask is 255.0.0.0
-Class B - the default mask is 255.255.0.0
+  - Class B - the default mask is 255.255.0.0
-Class C - the default mask is 255.255.255.0
+  - Class C - the default mask is 255.255.255.0
 Subnet masking is used when a portion of the host ID is used to identify a subnetwork. For
 example, if a portion of a Class B network address is used for a subnetwork, the mask could be
@@ Line 526: / Line 723: @@
 commonly see IP addresses written in “dot” notation; for instance, 192.228.32.14 (see IP net-
 mask).
-Glossary - 14
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual
+===== IP Netmask =====
-Glossary
+ - a pattern of 32 bits that is combined with an IP address to determine which bits
-IP Netmask - a pattern of 32 bits that is combined with an IP address to determine which bits
 of an IP address denote the network number and which denote the host number. Netmasks
 are useful for sub-dividing IP networks. IP netmasks are written in “dot” notation; for
 instance, 255.255.255.0 (see IP address).
-IPX Protocol (Internetwork Packet Exchange) - a NetWare protocol similar to the Xerox
+===== IPX Protocol =====
+ (Internetwork Packet Exchange) - a NetWare protocol similar to the Xerox
 Network Systems (XNS) protocol that provides datagram delivery of messages.
-IS (Intermediate system) - a system that provides forwarding functions or relaying functions
+===== IS (Intermediate system) =====
+ - a system that provides forwarding functions or relaying functions
 or both for a specific ATM connection. OAM cells may be generated and received.
-ISA Bus - a bus standard developed by IBM for expansion cards in the first IBM PC. The orig-
+===== ISA Bus =====
+ - a bus standard developed by IBM for expansion cards in the first IBM PC. The orig-
 inal bus supported a data path only 8 bits wide. IBM subsequently developed a 16-bit version
 for its AT class computers. The 16-bit AT ISA bus supports both 8- and 16-bit cards. The 8-bit
 bus is commonly called the PC/XT bus, and the 16-bit bus is called the AT bus.
-ISDN (Integrated Services Digital Network) - an emerging technology that is beginning to be
+===== ISDN (Integrated Services Digital Network) =====
+ - an emerging technology that is beginning to be
 offered by the telephone carriers of the world. ISDN combines voice and digital network ser-
 vices into a single medium or wire.
-ISO (International Standards Organization) - a voluntary, non treaty organization founded
+===== ISO (International Standards Organization) =====
+ - a voluntary, non treaty organization founded
 in 1946 that is responsible for creating international standards in many areas, including com-
 puters and communications.
-Isochronous - signals carrying embedded timing information or signals that are dependent
+===== Isochronous =====
+ - signals carrying embedded timing information or signals that are dependent
 on uniform timing; usually associated with voice and/or video transmission.
-ITU (International Telecommunications Union) - the telecommunications agency of the
-United Nations, established to provide standardized communications procedures and prac-
+===== ITU (International Telecommunications Union) =====
-tices, including frequency allocation and radio regulations, on a worldwide basis.
+ - the telecommunications agency of the
-J2 - Wide-area digital transmission scheme used predominantly in Japan that carries data at a
+United Nations, established to provide standardized communications procedures and practices, including frequency allocation and radio regulations, on a worldwide basis.
+===== J2 =====
+ - Wide-area digital transmission scheme used predominantly in Japan that carries data at a
 rate of 6.312 Mbps.
-Jitter - analog communication line distortion caused by variations of a signal from its refer-
+===== Jitter =====
+ - analog communication line distortion caused by variations of a signal from its refer-
 ence timing position.
-Jumper - a patch cable or wire used to establish a circuit, often temporarily, for testing or diag-
+===== Jumper =====
+ - a patch cable or wire used to establish a circuit, often temporarily, for testing or diag-
 nostics; also, the devices, shorting blocks, used to connect adjacent exposed pins on a printed
 circuit board that control the functionality of the card.
-LAN (Local Area Network) - a data network intended to serve an area of only a few square
+===== LAN (Local Area Network) =====
+ - a data network intended to serve an area of only a few square
 kilometers or less. Because the network is known to cover only a small area, optimizations can
 be made in the network signal protocols that permit higher data rates.
-lane - a program that provides control over the execution of the LAN Emulation Server (LES),
+===== lane =====
+ - a program that provides control over the execution of the LAN Emulation Server (LES),
 Broadcast/Unknown Server (BUS), and LAN Emulation Configuration Server (LECS) on the
 local host.
-ForeRunner HE/200E/LE ATM Adapters for the PC User’s Manual Glossary - 15
-Glossary
+===== LAN Access Concentrator =====
-Glossary
+ - a LAN access device that allows a shared transmission medium
-LAN Access Concentrator - a LAN access device that allows a shared transmission medium
 to accommodate more data sources than there are channels currently available within the
 transmission medium.
-LAPB (Link Access Procedure, Balanced) - Data link protocol in the X.25 protocol stack.
+===== LAPB =====
+ (Link Access Procedure, Balanced) - Data link protocol in the X.25 protocol stack.
 LAPB is a bit-oriented protocol derived from HDLC. See also HDLC and X.25.
-LAX-20 - a FORE Systems LAN Access Switch, designed to connect Ethernet, Token Ring, and
+===== LAX-20 =====
+ - a FORE Systems LAN Access Switch, designed to connect Ethernet, Token Ring, and
 FDDI LANs to ForeRunner ATM networks. The LAX-20 is a multiport, multiprotocol internet-
 working switch that combines the advantages of a high-performance LAN switch and a full-
 featured ATM interface capable of carrying LAN traffic.
-Layer Entity - an active layer within an element.
-Layer Function - a part of the activity of the layer entities.
+===== Layer Entity =====
-Layer Service - a capability of a layer and the layers beneath it that is provided to the upper
+ - an active layer within an element.
+===== Layer Function =====
+ - a part of the activity of the layer entities.
+===== Layer Service =====
+ - a capability of a layer and the layers beneath it that is provided to the upper
 layer entities at the boundary between that layer and the next higher layer.
-Layer User Data - the information transferred between corresponding entities on behalf of the
+===== Layer User Data =====
+ - the information transferred between corresponding entities on behalf of the
 upper layer or layer management entities for which they are providing services.
-le - a FORE program that implements both the LAN Emulation Server (LES) and the Broad-
+===== le =====
+ - a FORE program that implements both the LAN Emulation Server (LES) and the Broad-
 cast/Unknown Server (BUS).
-LEC (LAN Emulation Client) - the component in an end system that performs data forward-
-ing, address resolution, and other control functions when communicating with other compo-
+===== LEC (LAN Emulation Client) =====
-nents within an ELAN.
+ - the component in an end system that performs data forwarding, address resolution, and other control functions when communicating with other components within an ELAN.
-lecs - a FORE program that implements the assignment of individual LECs to different emu-
-lated LANs.
+===== lecs =====
-LECS (LAN Emulation Configuration Server) - the LECS is responsible for the initial config-
+ - a FORE program that implements the assignment of individual LECs to different emulated LANs.
-uration of LECs. It provides information about available ELANs that a LEC may join, together
-with the addresses of the LES and BUS associated with each ELAN.
+===== LECS (LAN Emulation Configuration Server) =====
-leq - a FORE program that provides information about an ELAN. This information is obtained
+ - the LECS is responsible for the initial configuration of LECs. It provides information about available ELANs that a LEC may join, together with the addresses of the LES and BUS associated with each ELAN.
+===== leq =====
+ - a FORE program that provides information about an ELAN. This information is obtained
 from the LES, and includes MAC addresses registered on the ELAN together with their corre-
 sponding ATM addresses.
-LES (LAN Emulation Server) - the LES implements the control coordination function for an
+===== LES (LAN Emulation Server) =====
+ - the LES implements the control coordination function for an
 ELAN. The LES provides the service of registering and resolving MAC addresses to ATM
 addresses.
 Link Down Trap - a CellPath 300 SNMP trap that signifies that the Ethernet interface has tran-
 sitioned from a normal state to an error state, or has been disconnected.