fibre cables have different terminations. You need to select the right cable which can connect to your deivce and the the other end to fiber patch panel so you need to check both. Some times the cables are mixed up in the patch so you need to pop the cables out and swap them around
ST (straight tip)
SC (Subscriber connector)
LC (Local connector)
MT-RJ
LR = long range / single mode
SR = short range / multimode
Have seen 10g LRM SFPs work on both multimode/singlemode cable.
You need to see how it is terminated at each patch point.
You need to have the correct SFP in your network device so you can plug the fibre in.
You also need to select the right cables SC-LC, ST-ST etc.
Look a bit into the SFP you should see a light on one side. This is the transmit side and needs to be the same all the way. You won't be able to see the light with single mode (its too narrow for the human eye). Need to use device db signals
-> red light transmit
<- no light receive
There are OM values that relate to cable distance will update more on that later
10Gig-Base-SR (closer to 0 is better)
Typical working transmit range: -1 to -7
Typical working transmit range: -1 to -9.9
When we see a Rx power around -14 dBm or lower there is typically some
sort of fault in the cable plant (bad splice, dirty connector, poorly
seated jumper etc.) that's causing excessive signal loss.
If either Tx or Rx is in the -30 dBm or lower range that's usually
indicative of there being no actual signal received and the transceiver
is reporting the "noise floor" of the receiver stage.
(https://en.wikipedia.org/wiki/Noise_floor)
https://www.cisco.com/c/en/us/products/interfaces-modules/transceiver-modules/index.html
CLI commands:
Router:
sh hw-module subslot 0/0 transceiver 2 status
sh hw-module subslot 0/0 transceiver 2 idprom
Switch:
sh int g1/0/1 status
sh int gig1/0/1 capabilities
sh int gig1/0/1 transceiver
