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New Member

DSP

How many DSP I need to 4 e1 (module HWIC-4T1/E1) in a 2821 Cisco Router?

5 REPLIES

Re: DSP

The HWIC T1/E1 card is not a voice card. Thus, DSPs are not applicable.

Sorry.

-nick

New Member

Re: DSP

I don't understand :( . Then I do not need the DSPs so that the four E1 in the Cisco 2821 work. When I need install DSP in the voice Gateway ?

Thanks

Cisco Employee

Re: DSP

Ricardo,

The HWIC-4T1/E1 is described as a T1/E1 high speed WAN interface card (WIC). As you know, WAN interface cards are used to connect your sites to each other. This is different from VWIC or VIC cards which may be used for voice termination, for example where you have a PRI configured on the router to terminate incoming voice calls from the PSTN. You need DSPs when you are doing voice termination. Voice termination applies to a call that has two call legs, one leg on a time-division multiplexing (TDM) interface and the second leg on a VoIP connection. The TDM leg must be terminated by hardware that performs coding/decoding and packetization of the stream. This termination function is performed by the DSP resources.

You would also need DSPs on the router if you need to configure media resources such as conferencing or transcoding resources on the router.

Hope this helps.

Regards,

Michael.

New Member

Re: DSP

Thanks mowuor, There is some Cisco book, ebook or document that explains this. For a greater understanding.

Cisco Employee

Re: DSP

Hi Ricardo,

Here's some information that may be useful.

Cisco Voice Gateways and Gatekeepers book:

http://my.safaribooksonline.com/158705258X/ch14

Configuring Enhanced Conferencing and Transcoding for Voice Gateway Routers document on CCO

http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf2.html#wp1010335

Media Resources Chapter on the CUCM SRND has some good information:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/7x/media.html

I hope these help.

Regards,

Michael

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