On Wed, 30 Jan 2008, Nick Voth wrote: >> Try putting a 12 db attenuator on the transmit portion, then re-try your >> loopback. We've found that the PA-MC-T3 cards tend to overdrive the DS3 a >> bit, and the only way that we've been able to get rid of the errors is >> attenuating the transmit load. > > Interesting, you're saying to put an attenuator on the transmit portion of > the card. Some of the Cisco documentation is saying to put it on the receive > portion. Is there any way using the "show controller" output to tell which > one has the "hot" signal?
He meant on the PA's receive (the telco's transmit). PA-MC-T3s are somewhat notorious for being sensitive to overly hot signals...where cisco's definition of 'overly hot' is 'normal' to several other vendors. In a pinch, if you can't find a suitable attenuator, you can use a really long service loop and/or multiple DS3 cables connected together using barrel connectors. We have at least one installation where after switching from a CAC Widebank28 to an Adtran mux, we ended up needing a coiled up 50' "service loop" sitting on top of the mux to keep the PA-MC-T3 happy. ---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
