[nsp] Gbic symbol errors

Jonas Frey (Probe Networks) jf at probe-networks.de
Mon Feb 23 04:44:35 EST 2004

Thanks to all who replied.
It was indeed the overloaded gbic, 10db of attenuatation fixed it.


On Mon, 2004-02-23 at 01:53, Stephen J. Wilcox wrote:
> > we are using serveral Cat. 3524XL here, which are connected to j-vendor
> "Juniper"
> > 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)
> Just a guess but if you're connecting LX back to back are you attenuating at 
> all? If not the errors are probably because your overloading the Cisco 
> receiver.. try sticking 10 or 20dB on of attenuation
> Steve
> > 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
> > hardware.
> > 
> > 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.
> > 
> > Regards,
> > Jonas
> > 
> > _______________________________________________
> > cisco-nsp mailing list  cisco-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-nsp
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> > 
Mit freundlichen Grüßen / With kind regards,
Jonas Frey

Probe Networks Jonas Frey        e-Mail: jf at probe-networks.de
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