[cisco-voip] How many DSPs for one E1

[Avner Izhar]

Hi,
 
You have 2 E1 ports and 4 FXS, this are served by 176 DSPs.
 
In general you can dedicate 108 DSPs to XCODE tasks, the exact amount is a product of what codecs
 are you going to transcode from, since transcoding to g.729 requires less then to g.723.
 
It is advisable to run your data on cisco's dsp calculator at:
http://www.cisco.com/cgi-bin/Support/DSP/cisco_prodsel.pl
 
Regards,
Avner Izhar, CCIE #15999 (Voice)
Network Learning Inc.
 

________________________________

From: cisco-voip-bounces at puck.nether.net on behalf of Jörg Wesely
Sent: Sun 5/13/2007 12:32 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] How many DSPs for one E1



Hi,

I've got a 2851 here that terminates one E1-line (ISDN PRI) for voice
that has some DSPs inserted (see show inventory below).

Can anyone tell me how many DSPs I need for this E1 and how many of them
can I use in a DSPfarm for transcoding and conference briding? I've
found some documentation about how many XCODE-sessions these DSPs can
handle, but nothing about the ones used for the ISDN termination.

Thanks in advance


Jörg




Show inventory gives this output:
---------------
NAME: "2851 chassis", DESCR: "2851 chassis"
PID: CISCO2851         , VID: V03 , SN: FTX1107A4QC

NAME: "Four port FXS DID voice interface daughtercard on Slot 0 SubSlot
0", DESCR: "Four port FXS DID voice interface daughtercard"
PID: VIC-4FXS/DID=     , VID: 3.1, SN: FOC103324K3

NAME: "VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1 on Slot 0
SubSlot 1", DESCR: "VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1"
PID: VWIC2-2MFT-T1/E1  , VID: V01 , SN: FOC10273FY4

NAME: "PVDMII DSP SIMM with three DSPs on Slot 0 SubSlot 4", DESCR:
"PVDMII DSP SIMM with three DSPs"
PID: PVDM2-48          , VID: V01 , SN: FOC11050MBR

NAME: "PVDMII DSP SIMM with four DSPs on Slot 0 SubSlot 5", DESCR:
"PVDMII DSP SIMM with four DSPs"
PID: PVDM2-64          , VID: V01 , SN: FOC10482Q30

NAME: "PVDMII DSP SIMM with four DSPs on Slot 0 SubSlot 6", DESCR:
"PVDMII DSP SIMM with four DSPs"
PID: PVDM2-64          , VID: V01 , SN: FOC10482Q38

NAME: "NM-SE on Slot 1", DESCR: "NM-SE"
PID: NM-CUE            , VID: V03, SN: FOC11045YTG

NAME: "40GB IDE Disc Daughter Card on Slot 1 SubSlot 0", DESCR: "40GB
IDE Disc Daughter Card"
PID:                   , VID:    , SN: FOC11053WB3
------------

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