[nsp] Gbic symbol errors

Stephen J. Wilcox steve at telecomplete.co.uk
Sun Feb 22 19:53:38 EST 2004

> 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)

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


> 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
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