More clues. It seems that everytime I ping with the 0000 pattern the controller counter: rx_soft_overrun_err=27473, increments. Philip --- Tim McKee <tim@baseworx.net> wrote:

This is most likely a framing or line-encoding mismatch, such as B3ZS vs PLCP on the physical DS3 or M13/M23 vs CBIT.

-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Philip Lavine Sent: Monday, September 20, 2004 1:26 PM To: nanog Subject: Re: HSSI-adtran

To all,

I tried the attenuator and they failed to provide any relief.

Philip --- Alex Bligh <alex@alex.org.uk> wrote:

...

--On 20 September 2004 07:56 -0700 Philip Lavine <source_route@yahoo.com> wrote:

...

I am having a problem witha DS3 that terminates into a Adtran CSU (T3SU-300) and then into a 7200 with HSSI. I can not ping with a 0000 data pattern and I

experience packet loss

...

...

and errors when I pass TCP traffic.

Adtran recommended an attenuator.

What is the issue here? Is the signalling incompatible with a PA-T3+. Should I be wasting my time with an external CSU?

Last time I looked, PA-T3+ were even MORE fussy about the need for attenuation than the non-"plus" variants (of the "never actually work with a BT DS-3 delivered as standard" sort of fussy). So yes you are probably wasting your time with an external CSU, but you are also quite likely to need attenuators anyway.

Alex

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