Differences

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--- networking:cisco-1921 [18/11/2025 00:04] – [Running Config] andrew
+++ networking:cisco-1921 [25/06/2026 11:05] (current) – [Optical Network Terminator] andrew
@@ Line 7: / Line 7: @@
 Replaces [[cisco-1841|Cisco ADSL & 1841 router]] as this is a Fast Ethernet only router, the 1921 is a similar router but with Ge0/0 and Ge0/1 interfaces and two hwic slots. I have a EHWIC-1GE-SFP-CU card as well because in the foreseeable future I may need to bring the internet in from the ISP ONT some distance away, so a utp to fibre next to the ONT would link to the WIC SFP port.
-Also, there is a USB port in addition to the serial connector, this implements a usb to serial converter internally, it shows up as ''/dev/ttyACM0''.
+Also, there is a mini USB port in addition to the serial connector, this implements a usb to serial converter internally, it shows up as ''/dev/ttyACM0''. The original "A" USB socket is, I believe, for plugging in a memory stick for copying firmware etc. I have never used this.
-{{ :networking:cisco-ehwic-sfp.png?100|Without SFP module}}
 Note this is NOT the direct fibre from the ISP, they provide a single WDM / TDM fibre to the Optical Network Terminator (ONT) as part of the G-PON WAN network, then a Ethernet copper RJ45 from the ONT to a fibre converter and on to the 1941 SFP fibre in a different building.
-{{:networking:ehwic-1ge-sfp.png?200|sfp fibre module fitted}}
+{{:networking:ehwic-1ge-sfp.png?150|sfp fibre module fitted}}
+{{:networking:cisco-ehwic-sfp.png?150|Without SFP module}}
@@ Line 123: / Line 124: @@
+After a reboot:-
+<code>
+int-router01>sh ver
+Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.7(3)M2, RELEASE SOFTWARE (fc2)
+int-router01>sh ip interface brief
+Interface                  IP-Address      OK? Method Status                Protocol
+Embedded-Service-Engine0/0 unassigned      YES NVRAM  administratively down down
+GigabitEthernet0/0         82.120.220.241  YES NVRAM  down                  down
+GigabitEthernet0/1         unassigned      YES NVRAM  down                  down
+GigabitEthernet0/0/0       unassigned      YES NVRAM  up                    up
+</code>
+The ''GigabitEthernet0/0/0'' interface is the WIC (Slot 0, port 0/0), the 0/0 and 0/1 are the fixed ethernet interfaces.
 ==== Running Config ====
@@ Line 128: / Line 145: @@
 To show a running config without page breaks, use ''term length 0''
+Old running config from 1841 - needs updating to Gigabit interfaces.
 <code>
 version 15.1
@@ Line 137: / Line 155: @@
 !
 boot-start-marker
-boot system flash:c1841-advipservicesk9-mz.151-4.M6.bin
+<del>boot system flash:c1841-advipservicesk9-mz.151-4.M6.bin</del>
 boot-end-marker
 !
@@ Line 295: / Line 313: @@
 {{:networking:450px-fttp-ont-pon.jpg?100|}}
+White:- Power 12v \\
+Yellow:- Cat6 UTP \\
+Green:- Single fibre on SC connector \\
@@ Line 301: / Line 323: @@
 Getting more off-topic, but maybe of interest.
-{{networking:gpon-switch.jpg?200 |}}
+{{networking:gpon-switch.jpg?400 |Alcatel Lucent}}
-{{ :networking:fx-16-gpon.jpg?200 |}}
+{{ networking:fx-16-gpon.jpg?400|}}
 {{ :networking:nokia_7360_data_sheet_en.pdf |}}