Optics and Optical Networking

In ISR 4431 router GLC-LH-SMD sfp not working, error log %TRANSCEIVER-3-INIT_FAILURE: R0/0: iomd: Detected for transceiver module in Gigabitethernet0/0/2, module disabled %TRANSCEIVER-3-INIT_FAILURE: R0/0: iomd: Detected for transceiver module in Gig...

I have a Cisco 9300 SFP port GLC-LH-SMD-CURV 1000Base-LH-SFP SMF plugged in and on the other end I have an SPF 10GBase-ZR SFP plugged in , do these have to match on both ends exactly?

Dear All, We have N9K-C9332D-GX2B with version 15.3(4e) and we have SFP QDD-400G-DR4-S  connected between the SPINE SWITCHES. (Design is B2B spine Multi-POD without IPN link) But strangely the B2B is not coming up the 400 GB SMF.. (100Gig MMF it work...

Hi everyone --So I'm trying to locate the SNMP OID for the integer that reports the receive power level for an DOM-capable SFP.Details:Platform, WS-C3750X and C9200L-24/48 port switchesSNMP platform. Centos 8 (NOT able to use Windows or any Win64 app...

Dear All,I am Using ESS 3300 Switch ( which has 2 x 10GbE SFP Port) for 10Gbps SFP.While doing speed test, I unable to get  10Gbps in both sending & Receiving.Instead, i could get only 1Gbps (max.).I want to know the maximum data rate which can get i...

Hi,We’ve been using for a long time transceivers (40G MPO) from an aftermarket vendor (fs.com) for our CISCO 3132Q-X usually they work well, but lately we have been seeing more failures than usual (suddenly a perfectly working transceiver starts havi...

Can the GLC-TE module be used in the SFP+ slot on the Firepower 2110? (SFP+ Slot on chasiss)

Hi,Why is the qsfp40g is cheaper than  sfp28 25 g Thanks

hello,Sometimes i'm bound to work in physical data center environment. Due to quite crowded racks it's hard to manage 100G connections especially when we're using passive copper 100G cables like QSFP-100G-CU. They take very lot rack space and it's ha...

Hello, I have a fiber-based infrastructure. The problem is that the signal that is delivered to it is not fiber, and I want to upgrade it. I talked to my ISP about it and they told me that I would have to get an ONT, with GPON port, which could conne...

I'm looking at documentation from Cisco's site and I see that the WS-C3750G-12S-S switch supports GLC-GE-100FX as an SFP transceiver - which is for MMF.Apparently, a site is running SMF everywhere but connecting things to this switch. I see a few dif...

Hello, I'm considering to buy some fiber cleaning tools. I liked the one called - cletop-s fiber cleaning tool (made by NTT) https://www.aflglobal.com/Products/Test-and-Inspection/Fiber-Inspection-and-Cleaning/Fiber-Optic-Cleaning/CLETOP-S-Series-Opt...

Hello.1. If it is determined that a switch has a completely dead fiber port, should the RMA be for a transceiver or for the entire device?2. Anyone know how to differentiate if a completely dead fiber port is because of only a transceiver, or more th...