[c-nsp] Cisco NMs for DS3, equivalent to Adtran MX2800 mux-er?!?

[robbie]

According to...

http://www.cisco.com/en/US/products/ps5855/products_data_sheet0900aecd8016a8e8.html

...it doesn't look like you can put a Channelized T3 network module in a 
3845, or even get a channelized T3 in the NM- format. We do precisely 
this at my office, in reverse - we're using a MX2800 to accept T1s 
handed off to us in a POTS bay in a CO, to mux them up into a PA-MC-T3 
interface on a 7206. You can easily get a clear-channel or ATM DS3 
interface for the 3845, but not channelized.

You might have much better luck getting an older 7200, and picking up a 
used PA-MC-T3+ or PA-MC-2T3+. Be mindful, I don't think you can 
configure the base models (PA-MC-T3/PA-MC-2T3) as clear-channel, so if 
this is a factor going forward, drop the change on the + models. Hope 
this helps.

--
Cheers,
Robbie

Network Fortius wrote:
> Given:
> DS3 on a Sonet ring, coming into the building into an Adtran MX2800  
> (http://www.adtran.com/static/ENTERPRISEPRODUCTS/T3/MX2800UNITS/ 
> 1200290L1.htm), with T1s from various locations mux-ed together by  
> our ring provider. The Adtran device then splits them into separate  
> T1s (some "pure" data, some voice and data), and delivers them to  
> individual CSU/DSU units, which then split voice and data into PBX  
> and serial interfaces of a router, respectively, or - the pure data  
> T1s - straight into serial interfaces of the same (old Nortel)  
> router. In an attempt to replace this router with a Cisco 3845 (as  
> previously - and correctly - recommended by someone on this list,  
> earlier), I ran into a problem in the design phase: if keeping the  
> existing setup with Adtran, and just trying to replace the Nortel and  
> the CSU/DSUs, I would max out the 3845 because of the need for VWICs  
> and VWIC-DI cards.
> 
> Question:
> Based on the above info - my thought is to try - next - to replace  
> more of the upstream devices, such that I would not get individual  
> T1s (data, or voice&data) with their corresponding VWIC or VWIC-DI  
> cards, but rather a whole NM with a DS3 interface, then do the demux- 
> ing in the Cisco, vs. the Adtran (the idea being that all these  
> routers - old, as well as new - are nothing else than "consolidators"  
> of remote WAN lines into one single ethernet interface, with  
> appropriate routing at the IP layer, for each location). Does anybody  
> know of a way to address something like this, and/or parts I should  
> read more about?
> 
> TIA,
> Stef