Netgear Switch will not 'see' GBIC module

Posted on 2008-11-18
Last Modified: 2012-05-05
We have 2 FSM726 switches linking 2 offices via a fibre cable. The network went down and the problem seems to be down to one of the switches. It previously worked fine for 6 months. The fibre has been checked and is currently back up running on old kit.

 The web based menu on switch A does not show any GBIC modules plugged in. We have changed the port config from Auto to GBIC amongst other methods to get it to work.
Eventually we had the switch replaced but the replacement switch does exactly the same thing.

Switch B does indicate a GBIC module is installed (The port shows as Blue for 'Training' on the web based config). To confuse matters, we have also just discovered that Switch B shows the GBIC port as Blue even if no module is installed.

Any ideas would be greatly appreciated.
Question by:cybis1
    LVL 21

    Accepted Solution

    please check switches firmware.
    please try to check if gbic is fine ( you can take two switches and two gbic and try to connect them with fiber cord)
    even more, when you insert gbic into port, you should be able to see red light coming from "transmit" hole, when looking directly into gbic.
    If you can see the light, that means gbic is working and is powered. Then you can check the second gbic in the same way and if both are working, try to connect them with patch cable. the line should come up.

    Btw, in case of a long line (between two buildings) you also should be able to see red light coming from one of the strands, if the other end is connected to an active gbic.
    LVL 1

    Author Comment

    One of the GBIC modules does indeed have no light showing on the transmit side. We are awaiting confirmation from Netgear that the module itself is indeed dead.
    LVL 21

    Expert Comment

    ok, please update, when you get any info from netgear

    Featured Post

    IT, Stop Being Called Into Every Meeting

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Join & Write a Comment

    Suggested Solutions

    The worst thing when starting a new job is when the previous Network Administrator left behind no documentation. How do you get into the devices? If you've been in this situation or just accidently mistyped your password, this article will hopefully…
    I see many questions here on Experts Exchange regarding switch port configurations and trunks. This article is meant for beginners in the subject to help to get basic knowledge about Virtual Local Area Network (VLAN (…
    Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…
    Internet Business Fax to Email Made Easy - With eFax Corporate (, you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

    755 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now