[c-nsp] T1 crossconnect best practice?

[Matthew Crocker]

Cisco ONS 15454 with XT-VT or XT10G cards can handle VT1.5 cross  
connects which will give you 672 DS1 cross connects in each SONET node.

Here is what we do

  Verizon delivers 28 DS1s to our CFA via wire wrap pins.  We cross  
connect them to our SCOPE bay and wire wrap them to a Telect 84 port  
DSX panel.   The DS1 is then wired into a Carrier Access Corp  
WideBank 28 M13 Mux.  The resulting DS-3 is connected to a DS3-6XM  
port on our Cisco ONS 15454.  I can see each DS1 in the SONET ring  
and map them anywhere I want to go.  I can hairpin it back out a  
different DS1 on the same DS-3 (PtP in same CO)  or map them to  
another DS-1 in another DS-3 in another SONET node.    We have an  
OC-48 running around Western MA which is our ONS ring.

-Matt


On Sep 14, 2005, at 7:17 PM, Michael Loftis wrote:

>
>
> --On September 14, 2005 11:55:05 AM -0400 Mike Andrews  
> <mandrews at bit0.com>
> wrote:
>
>
>> We've started getting into some situations where we'd like to sell  
>> raw
>> point-to-point T1's to customers without Internet access on 'em.  For
>> various reasons it's cheaper to run two T1's, one to each end,  
>> that come
>> back to our central location, and then cross-connect them together,
>> rather  than run one line end-to-end.  (Don't ask why.)  :)
>>
>> We could easily do that with a T1 crossover cable between the  
>> jacks, but
>> we can't monitor the line for errors then...  plus, at some point  
>> soon we
>> may bring them in on a channelized DS3 which will make that  
>> approach a
>> bit  tricky without a mux.
>>
>
> If you want to do TDM, why not use a TDM system...maybe a Total  
> Access 4303
> from Adtran?  Or the mutliservice modules for the Cisco platforms,  
> I'm not
> sure if they're available for 7206's or not.  Not really sure if those
> provide the features you want, or use a DS1 patch bay panel...
>
> Basically you need a frame with Digital Cross Connect capability or  
> Time
> Slot Interchange capability...some M13 or T3 mux's with D&I also  
> have this
> capability.  (and some will call these capabilities synonymous)
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--
Matthew S. Crocker
Vice President
Crocker Communications, Inc.
Internet Division
PO BOX 710
Greenfield, MA 01302-0710
http://www.crocker.com