[nsp] Gbic symbol errors

Church, Chuck cchurch at wamnetgov.com
Sun Feb 22 19:57:52 EST 2004

What's the distance of the cable between the two devices?  If both ends are LX/LH, it's possible that too much power is being received.  Check out:

 table 22 for max power that the Cisco GBIC will accept.  It's possible Juniper puts out more power, and that's the problem.  Just a possibility...

Chuck Church
Lead Design Engineer
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch at wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com

-----Original Message-----
From: Jonas Frey (Probe Networks) [mailto:jf at probe-networks.de]
Sent: Sunday, February 22, 2004 7:40 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] Gbic symbol errors


we are using serveral Cat. 3524XL here, which are connected to j-vendor
routers. On one of the 3524 (equip. with a LX/LH Gbic 5486) I tried all
possible duplex and flowcontrol options, however i always get (fast
increasing >100/sec) 
"Symbol error frames".
(show controllers ethernet-controller)

I found a short description on this error:
A Symbol error means the interface detects an undefined(invalid) Symbol
received.  Small amounts of symbol errors can be ignored. Large amounts
of symbol errors could could indicate a bad device, cable or bad

However, does anyone have encountered this error before and if how did
you fix it? (Is this really a hardware fault?)

Oh yeah, IOS is Version 12.0(5)WC3b.

Btw, on the j-vendor interface i dont see any errors at all.


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