[c-nsp] Debugging T1 Bounces on CT3

[robbie]

Greg Boehnlein wrote:
> On Tue, 5 Apr 2005, Greg Boehnlein wrote:
> 
> 
>>Hello all,
>>	We have a 7507 w/ RSP4/256M and a VIP-2-50 w/ CT3 card running 
>>rsp-pv-mz.123-11.T3.bin. The CT3 card is plugged into an Adtran MX2800 DS3 
>>mux. The Adtran is used to consolidate DS1 circuits from various carriers 
>>into a single Channelized DS3. So, the layout looks like this:
>>
>>Carrier A -> DS1 -> MX2800 -> CT3 (7507)
>>Carrier B -> DS1 ---^
>>
>>For the most part, this has been flawless and very stable up until about a 
>>week ago. Our logs show constant T1 controller failures as far back as 
>>3/26/05 and continuing up to the present.
> 
> 
> As a status update to this, we replaced everything.
> 
> 1. Replaced the MUX. No Change.
> 2. Replaced the Cables. No Change.
> 3. Added Ferrite RF shields to the cable. No Change.
> 4. Replaced the Ciscp PA-MC-T3 card. No Change.
> 5. Backed down to a Cisco IOS 12.2.19 Service Provider / VIP. No Change.
> 5. Purchased Attenuators ranging from 2db to 20db. Minor change.
> 
> The best we can do currently is the following w/ a 12db Attenuator:
> 
> core1.cleveland#show controllers t3 1/0/0 tabular 
> T3 1/0/0 is up.  Hardware is CT3 single wide port adapter
>   CT3 H/W Version: 1.0.1, CT3 ROM Version: 1.1, CT3 F/W Version: 2.4.3
>   FREEDM version: 1, reset 0 resurrect 0
>   Applique type is Channelized T3
>   Description: Muxed DS3 to Adtran MX2800
>   No alarms detected.
>   MDL transmission is disabled
>     
>   Far-End MDL Information Received
>      EIC: N/A, LIC: N/A, FIC: N/A, UNIT: N/A
>      Path FI: N/A
>   FEAC code received: Multiple DS1 LOS/HBER
>   Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Line

Tried M13 framing instead of c-bit?
-- 
Cheers,
Robbie