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--- rb:sfp [07/05/2018 10:16] – created - external edit 127.0.0.1
+++ rb:sfp [30/11/2025 22:34] (current) – [Multimode Fibre] andrew
@@ Line 1: / Line 1: @@
 ====== SFP module (Small Form-factor Pluggable) ======
-SFP modules followed on from [[rb:gbic|GBIC]] modules and are used in both ethernet and fibre channel switches (and others too), they are usually optical I/O modules although RJ45 copper Ethernet ones are available. Ethernet modules are most commonly 1GB/s but 10GB/s and higher are available. SFP used for Fibre channel can be 1 or 2GB/s but most common is 4GB/s.
+SFP modules followed on from [[rb:gbic|GBIC]] modules and are used in both ethernet and fibre channel switches (and others too), they are usually optical I/O modules although RJ45 copper Ethernet ones are available. Ethernet modules are most commonly 1GB/s but 10GB/s and higher are available.
+SFP used for Fibre channel can be 1 or 2GB/s but most common is 4GB/s.
+===== LC Fibre =====
 {{:rb:sfp1.jpg?200|}}
@@ Line 10: / Line 16: @@
 {{:rb:sfp-plug.gif?200|}}
+===== RJ45 =====
 Although less common, SFP modules can have an RJ45 socket for copper connectivity.
@@ Line 15: / Line 25: @@
 {{:rb:20180117_193058.jpg?200|}}
 {{:rb:20180117_193033.jpg?200|}}
+===== WDM Fibre =====
+{{ rb:img_20250129_180855.jpg?200|}}
+{{rb:img_20250129_181046.jpg?170 |}}
+Another option is Wavelength Division Multiplex SFP which use two different wavelength for Tx and Rx, so only needing one fibre. This example uses SC single mode ( SC == Stick 'n' Click )
+----
+{{ :rb:single-bidirectional-fibre.jpg?400 |}}
+----
+{{:rb:img_20250129_181153.jpg?200 |}}
+As this used two wavelengths, the SFP needs an optical splitter, and will have both a laser and receiver on the two prism ports.
+----
+{{:rb:img_20250129_181211.jpg?200 |}}
+I'm guessing here, but I believe the laser is mounted at the rear with the 3 pins connection to the PCB, and the RX connections are on the side with flexible connection to the PCB.
+{{ rb:img_20250129_181824.jpg?200|}}
+----
+{{:rb:img_20250129_181655.jpg?200 |}}
+Close-up of the Prism housing and SC receptacle.
+----
+===== Multimode Fibre =====
+Just a look inside for interest...
+{{:rb:sfp_152322.jpg?200 |}}
+{{:rb:sfp_152240.jpg?200 |}}
+My guess is that the Single mode SFP are very similar to the Multi Mode, although the lasers may be more powerful, possibly bigger or have a heatsink?
+===== SFP commands - IOS =====
+Specific to Cisco IOS as SFPs can be found in Fibre Channel SAN switches and other manufacturer's kit.
+Inserting a SFP module
+<code>
+router01#
+*Nov 30 19:44:22.751: %EHWIC_1GE_SFP_CU-6-SFP_INSERTED: Transceiver module 1000BaseSX SFP is inserted in GigabitEthernet0/0/0 interface.
+</code>
+This is in a [[networking:cisco-1921|Cisco 1921 Gigabit router]] with a WIC for gigabit copper and and SFP module.
+<code>
+router01#sh inventory
+NAME: "CISCO1921/K9", DESCR: "CISCO1921/K9 chassis, Hw Serial#: FCZ1625C5YF, Hw Revision: 1.0"
+PID: CISCO1921/K9      , VID: V04 , SN: FCZ1625C5YF
+NAME: "Enhanced High Speed WAN Interface Card-1 Port Gigabit Ethernet SFP/Cu on Slot 0 SubSlot 0", DESCR: "Enhanced High Speed WAN Interfa"
+PID: EHWIC-1GE-SFP-CU  , VID: V01, SN: FOC15164VRP
+NAME: "1000BASE-SX SFP", DESCR: "1000BASE-SX SFP"
+PID:  , VID:    , SN: FNS1007Q4PF
+</code>