[c-nsp] Adtran MX-2800 to PA-MC-T3

[Roy]

David Barak wrote:

>--- Greg Boehnlein <damin at nacs.net> wrote:
>
>  
>
>>On Tue, 2 Aug 2005, David Barak wrote:
>>
>>    
>>
>>>>Hello,
>>>>	We have a problem that we have exhausted all
>>>>available resources 
>>>>on solving, and we are running into a dead end.
>>>>        
>>>>
>>We
>>    
>>
>>>>have several T1 
>>>>circuits, from various LECs provisioned into a
>>>>single MX-2800 MUX at our 
>>>>location. We then tie that mux into a PA-MC-T3
>>>>        
>>>>
>>card
>>    
>>
>>>>on a 7507 in a 
>>>>VIP-2-50 to terminate the circuits. The DS-3
>>>>        
>>>>
>>cabling
>>    
>>
>>>>is 25 feet in 
>>>>length and we have (per Cisco reccomendations) a
>>>>        
>>>>
>>6
>>    
>>
>>>>db attenuator on the 
>>>>PA-MC-T3 RX leg. We are running CBIT, w/ the MUX
>>>>providing timing.
>>>>
>>>>We continue to receive LCVs, C-Bit and P-Bit
>>>>        
>>>>
>>framing
>>    
>>
>>>>errors, and the DS1 
>>>>circuits will occasionally bounce.
>>>>
>>>>So far we have tried:
>>>>
>>>>1. Replacing the cabling.
>>>>2. Replacing the attenuators.
>>>>3. Replacing the PA-MC-T3 card.
>>>>4. Replacing the MX-2800 MUX.
>>>>5. Replacing the VIP-2-50 card.
>>>>6. Changing clocking directions.
>>>>        
>>>>
>>>Are you sure you're supposed to be running c-bit
>>>between the MUX and PA-MC-T3?  When I've built
>>>      
>>>
>>these,
>>    
>>
>>>I've always needed to use M13.
>>>      
>>>
>>Yeah, that is what I've always thought. However, the
>>PA-MC-T3 does not 
>>seem to support M13.
>>
>>core1.cleveland(config)#controller t3 1/0/0
>>core1.clev(config-controller)#framing ?
>>  auto-detect  Application Identification Channel
>>Signal
>>  c-bit        C-Bit Parity Framing
>>  m23          M23 Framing Format
>>
>>We are running the following PA-MC-T3 revision:
>>
>>        PA Bay 0 Information:
>>                CT3 single wide PA, 1 port
>>                EEPROM format version 1
>>                HW rev 1.00, Board revision A0
>>                Serial number: 17814706  Part
>>number: 73-3037-01
>>
>>We had tried using "auto-detect" originally, but
>>this was bad bad bad, so 
>>on the advice of Adtran, we locked it to C-bit.
>>
>>Am I missing something? Should M23 work w/ M13? 
>>    
>>
>
>Sorry, bad typo on my part - yes, you want M23.  M13
>is for the T1s which are part of an M23 T3.
>
>-David
>
>David Barak
>Need Geek Rock?  Try The Franchise: 
>http://www.listentothefranchise.com
>
>  
>
This seems to be a good reference:

http://www.sbei.net/archive/whpapers_articles/ds3_wpaper.pdf

M12 is stuffing DS1s into a DS2
M23 is stuffing DS2s into a DS3
M13 is running both of these (DS1 into DS3)