Problem in configuring E1

Unanswered Question
Dec 10th, 2007
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Hello,


i have one 2851 with 2 E1, i have configured the first when i want to configure the second, the following message is displayed :


Router(config-controller)#pri-group ti

Router(config-controller)#pri-group timeslots 1-31

% Not enough DSP resources available to configure pri-group on controller E1 0/0/1

% The remaining dsp resources are enough for 6 time slots.

% For current codec complexity, 2 extra dsp(s) are required to create this voice port.


when i type sh inventory, i find that i have PVDM2-48


Router#SH INVENtory

NAME: "2851 chassis", DESCR: "2851 chassis"

PID: CISCO2851 , VID: V04 , SN: FCZ1145718B


NAME: "Two port E1 voice interface daughtercard on Slot 0 SubSlot 0", DESCR: "Two port E1 voice interface daughtercard"

PID: VWIC-2MFT-E1 , VID: V02, SN: 36010647


NAME: "2nd generation four port FXO voice interface daughtercard on Slot 0 SubSlot 1", DESCR: "2nd generation four port FXO voice interface daughtercard"

PID: VIC2-4FXO , VID: V02 , SN: FOC11412LLL


NAME: "2nd generation four port FXO voice interface daughtercard on Slot 0 SubSlot 2", DESCR: "2nd generation four port FXO voice interface daughtercard"

PID: VIC2-4FXO , VID: V02 , SN: FOC11401M2Q


NAME: "2nd generation four port FXO voice interface daughtercard on Slot 0 SubSlot 3", DESCR: "2nd generation four port FXO voice interface daughtercard"

PID: VIC2-4FXO , VID: V02 , SN: FOC11412LPY


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: FOC11373EWK


NAME: "AIM Service Engine 0", DESCR: "AIM Service Engine"

PID: AIM-CUE , VID: V03 , SN: FOC114146D6


i don't know if it's suffisant to support 2 ports with 30 channels for everyone.


i wait for your feedback.


thanks

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ananddiwakar Mon, 12/10/2007 - 06:52
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With the configuration you have, at minimum you will need 1 PVDM2-48 + 1 PVDM2-16 + 1 PVDM2-8

This is considering G.711 codec. If you are using higher complexity codecs, the DSP requirement will increase.


You can get this calculation using DSP calculator here (Registered users)

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


The following document will explain some more details


http://www.cisco.com/en/US/products/hw/modules/ps3115/products_qanda_item0900aecd8016c6ad.shtml



allan.thomas Mon, 12/10/2007 - 06:57
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Given the specifications or hardware requirements for your router platform there are insufficient DSPs as you already know, and the output suggest you require 2 additional DSPs.


For you information a single PVDM2-48 supports 3 DSPs and in order to support your configuration of 2 E1 Pri trunks and 3 4-Port FXO modules you will require 5 DSPs in total for FLEX complexity, this is the absolute minimum.


Therefore in order to utilise you exiting PVDM2-48 you will require additional 32 voice-channels, the PVDM combinations are broken down as follows. I believe 2851 support 3 PVDMS:-


one PVDM2-64 + one PVDM2-8

two PVDM2-32 + one PVDM2-8

one PVDM2-16 + one PVDM2-48 + one PVDM2-8.


If you have on a single PRI trunk then a PVDM2-48 would be sufficient for a single E1 and 12 FXO ports. This is not including any harward transcoding/conferencing, if you require such resource then you will definately require additional PVDMs.


Hope this helps

Regards

Allan.

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