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New Member

1841 with PRI for ISDN, is it possible?

Hello,

I got an 1841 router and installed a VWIC2-1MFT-T1/E1 card for our incoming PRI. I got the card setup for a T1 but when I try to do the pri-group config I get the following error:

%Please configure network-clock-participate wic 0 first

%Insufficient resources to create pri-group - it has been removed

If I try to enter the network-clock-participate wic 0 command I get an error. The command doesn't seem to be avaiable.

Our goal was to use this router as our ISDN backup router.

Should this configuration work?

Thanks,

Eric

9 REPLIES
New Member

Re: 1841 with PRI for ISDN, is it possible?

As dumb as this sounds, I used the setup utlitiy and it worked. I don't know why it wouldn't let me enter the command.

New Member

Re: 1841 with PRI for ISDN, is it possible?

Nevermind, as soon as the router reloaded I got the same message back.

Overall, will a 1841 with a VWIC2-1MFT-T1/E1 card work with the following configuration:

controller t1 0/0/0

framing esf

linecode b8zs

pri-group timeslots 1-24

interface Serial0/0/0:23

no ip address

encapsulation ppp

dialer rotary-group 0

dialer-group 1

isdn switch-type primary-ni

isdn timer t321 0

Then allow incoming and outgoing ISDN dial on demand connections...

Thanks!

Hall of Fame Super Gold

Re: 1841 with PRI for ISDN, is it possible?

Hi, you need a minimum of a 2811 and HWIC-1CET1-PRI for ISDN PRI data:

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/product_data_sheet0900aecd80710c88.html

Hope this helps, please rate post if it does!

New Member

Re: 1841 with PRI for ISDN, is it possible?

Thank you for that information but is that card something that is data specific? We've used the VWIC for our Voice PRI.

I'm a little confused that there wasn't better documentation for this stuff. I checked and that other card is 2x the cost.

Hall of Fame Super Gold

Re: 1841 with PRI for ISDN, is it possible?

Hi, the VWIC is mainly made for voice PRI and channelized (not PRI) configurations. It is possible to use it for data PRI but on the bigger routers, not the 1841.

Last time I've checked the HWIC-1CE1T1-PRi is priced less than the VWIC2.

Re: 1841 with PRI for ISDN, is it possible?

Hi Paolo,

If you go through the datasheet of 1841 router it states that it supports VWIC modules only for Data.

I am also aware that these modules when configured for ISDN PRI can terminate only voice calls and can not be used for data connectivity.

I would like to understand what signaling is used for data connectivity when used on 1841 router.

Its a bit confusing for me.

-> Sushil

Re: 1841 with PRI for ISDN, is it possible?

Just the Channelized T1/E1 support for Data?

Hall of Fame Super Gold

Re: 1841 with PRI for ISDN, is it possible?

VWIC can work as:

- channelized data w/o signaling, aka Nx64.

- CCS - PRI uses Q.931 and can be voice, data, or 3.1 KHz Bearer (proper fax and modem).

- CAS - R1 for N.A. and R2 any variant.

On the 1841 only first mode is supported.

Re: 1841 with PRI for ISDN, is it possible?

got it. Thanks a lot Paolo.

-> Sushil

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