Hi
I have two SG300-20 Switches and buy two MGBLX1 Modules for the Switches.
I plugedin the Modules but the Modules didn`t work and in the WebConsole i can´t see the Modules.
Is there any configuration to enable the SFP Modules? or is it a problem from my Switches
Has anyone an idee?
Regards Dominik
Hi Dominik,
I'm going to ask some simplistic questions regarding;
1. Type of fiber you are using, as you may have some cabling issue
2. Have you checked the error log to see if the switch sees the insertion of a SFP
3. Diagnostic > Optical Module Status good way to check what's happening with SFP
4 . maybe a quick loopback test for a quick visual indication that the SFP may be working.
Fiber
On the side of the fiber it should say 9um (micrometers) which is single mode fiber, maybe even a yellow coloured fiber pair. If the cable is not 9um single mode cable most likely the installation will NOT work. You realize that the fibers have to be crossed over so that a transmit port on one SFP has to be sent to the remote receive port on the remote SFP.
Error log
But, you should check if the error log notes the insertion of a SFP,
When i look at my System summary the fiber port is treated with precedence over the copper port when both are used. So if there is no link you will not see a green LED icon on the System Summary page to indicate a link.
If you check my partial error log copy and paste below, you will see i plugged my SFP into slot GE10 of my SGE300-10P (SRW2008P-K9-NA)
2147483597 2011-May-23 22:48:14 Informational %Fiber-I-SFP-PRESENT-CHNG: gi10 SFP status is present., aggregated (2)
2147483600 2011-May-23 22:48:06 Informational %Fiber-I-SFP-PRESENT-CHNG: gi10 SFP status is present.
2147483601 2011-May-23 16:45:40 Informational %INIT-I-Startup: Cold Startup
If you do not see SFP entries in your error log, maybe the SFP is defective, but lets remove the SFP and kindly ask someone else in your office to insert the SFP.
Did you see any error log entries referreing to SFPs?
Optical Module Status
Ok, lets check the diagnostic state of the SFP ports, as per my screen capture below.
It shows GE10 RX and TX power levels , refer Admin guige page 59 for more details;
Do you see any output or input power levels, or a empty row representing the port the SFP is inserted into ?
(Maybe paste a screen capture of this page.)
Radical Diagnostic
Your error log shows a insertion of a SFP, Optical Status will potentially show you power levels and if the SFP has loss of signal.
If the SFP is inserted correctly, and hasn't been zapped by Electrostatic Discharge (ESD) from incorrect handling there is one last thing you can try;
With a single fiber (not dual fiber patch) patch the Transmit port to the Receive port on the SFP module and you should see a link light on the front of the switch turn green..This indiactes that light from the light Transit port is reaching the light Recieve port. But probably is causing a loop if you keep the cable connected.
Please do not keep the fiber inserted for more than a second or two.
Did you see the switch port link light turn green ?
regards Dave
