[cisco-voip] Maximum number of T1 on 3845

[Darren]

One of the clients I work with has 3 * 3845's with 4 * VWIC-E1-2MFT on the
motherboard and 1 * NM-HDV with 1 VWIC-E1-2MFT, can't remember the exact
part number but they are the 2 port E1's VWIC's.  They are running these
with permanent calls through each channel, i.e. 7 hour calls throughout the
day.  They are fully populated with DSP's and the only issues we had were
when they doing g729 across the WAN and the dial-peers were 711 (i.e. not
enough transcoding resources or something, can't exactly remember why),
Eventually the DSP's ran out at around 240 calls split among two of the
3845's.  So approximately 120 calls.  Once we sorted out the 729 issue
everything has been fine.  I haven't had any reports of CPU or Memory
issues, and checked yesterday, with 150 active calls CPU was 14%, memory
wasn't an issue.

I found the DSP calculator to be good at calculating how many E1's you could
have running,

http://www.cisco.com/cgi-bin/Support/DSP/cisco_prodsel.pl


Cheers

D


On Wed, Aug 27, 2008 at 12:40 AM, Aman Chugh <aman.chugh at gmail.com> wrote:

> Hi Darren,
>
> Thanks for your reply, I checked DSP calculator and found 24 DSP for 8 T1
> when running G711. Just wanted to check that the router is stable with that
> many T1 's terminating and does not have CPU and memory issues.
>
> Aman
>
>
> On 8/26/08, Darren Pedley <darren at dnsl.com> wrote:
>>
>> I have 10 e1's in a coulpe of 3845's running g711 (ie 20+ e1s).  You have
>> to watch your DSPs, best to look for the DSP calculator on cco and check.
>>
>> D
>>
>> On 27/08/2008, at 12:20 AM, "Aman Chugh" <aman.chugh at gmail.com> wrote:
>>
>>
>>> Just wanted to know if I can have 8 T1 pri terminate on Cisco 3845 , any
>>> one already doing the same , any caveats that I need to be aware of , apart
>>> from the AS5300/5400 , what are my other options to terminate 8 T1 on a
>>> single router, I am putting in 6 PVDM2-64 to support this configuration.
>>>
>>>
>>> Aman
>>> _______________________________________________
>>> cisco-voip mailing list
>>> cisco-voip at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>
>>
>
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