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Beginner

T1 configuration problem

Hello everyone

I have T1 HWIC in slot 2 and T1 Network module in slot 2 . Router is 3845.

If I configure first HWIC T1 for channel-group 0 timeslots 1-24 speed 64 then I'm not able to configure Module T1. I'm getting this error:

Router(config-controller)#channel-group 0 timeslots 1-24 speed 64
%Insufficient resources to create channel group
Router(config-controller)#
*Jul 30 21:52:23.111:  No Free HDLC resources (8)

If I configure first Module then I'm not able to configure HWIC. Do you know why ? Are they sharing some resources ?

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted

Hello,

NM-HDV module supports a maximum of 32 HDLC channels with a bandwidth of 2

Mbps. So, when you configure timeslots, since you have already configured 24

slots on one card, you can at the maximum support 8 on the second.

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/hdd_vfnm.html

http://www.cisco.com/warp/public/cc/pd/rt/ps282/prodlit/guido_ds.pdf

Data Features (Only Supported on NM-HD-2VE)

. Support serial data WAN access using T1/E1 or fractional T1/E1 network

interface

. N X 64 Kbps or N X 56 Kbps channel group data rates (T1:N=1 to 24, E1:N=1

to 31)

. Supports up to 32 data channel groups with a total bandwidth of up to 2

Mbps

. Supports integrated data WAN access and DS-0 voice channels on the same

T1/E1

Hope this answers your questions.

Regards,

NT

View solution in original post

5 REPLIES 5
Highlighted
Cisco Employee

Hello,

Looks like you may not have enought DSP resources. Please use the following tool to calculate the optimal resource requirement.

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

You would need Cisco ID to use this tool.

Hope this helps.

Regards,

NT

Highlighted
Beginner

You may have independent clocking configured, if you do then the controller will only support one channel group.

Jean Paul Moncada

Highlighted
Beginner

Thank you for your help

I have to types of cards in router: NM-HDV2-2T1/E1 and VWIC2-2MFT-T1/E1. Let’s say I want to configure Network Module in slots 3/0, 3/1 and VWIC in slots 3/0/0 and 3/0/1.

If I start with configuration of VWIC, I’m not able to configure Network Module:

Router(config)#controller t1 3/0/0

Router(config-controller)#channel-group 0 timeslots 1-24

Router(config-controller)#controller t1 3/0/

*Jul 31 09:48:06.829: %LINK-3-UPDOWN: Interface Serial3/0/0:0, changed state to down

*Jul 31 09:48:07.829: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0/0:0, changed state to down

Router(config-controller)#controller t1 3/0/1

Router(config-controller)#channel-group 0 timeslots 1-24

Router(config-controller)#controller t1 3/0

*Jul 31 09:48:12.797: %LINK-3-UPDOWN: Interface Serial3/0/1:0, changed state to down

*Jul 31 09:48:13.797: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0/1:0, changed state to down

Router(config-controller)#controller t1 3/0

Router(config-controller)#channel-group 0 timeslots 1-24

%Insufficient resources to create channel group

Router(config-controller)#

*Jul 31 09:48:16.469:  No Free HDLC resources (8)

But if I remove channel-group from VWIC I’m able to configure Network Module:

Router(config-controller)#controller t1 3/0/1

Router(config-controller)#no cha

Router(config-controller)#no channel-group 0

Router(config-controller)#controller t1 3/0

Router(config-controller)#channel-group 0 timeslots 1-24

Router(config-controller)#

And this is what I don’t understand. I thought that if NM-HDV2-2T1/E1 can create only 1 full T1 channel group then I will be able to create 2 full T1 with VWIC2-2MFT-T1/E1 and 1 full T1 with NM-HDV2-2T1/E1. But I’m only able to create 2 full T1s and it doesn’t matter if I create them on NM-HDV2-2T1/E1 or VWIC2-2MFT-T1/E1. It depends only on which card I start configuring first.

If I remove channel-group from VWIC I can have 2 full T1s on NM-HDV2-2T1/E1

Router(config)#controller t1 3/0/0

Router(config-controller)#no channel-group 0

Router(config-controller)#controller t1 3/1

Router(config-controller)#channel-group 0 timeslots 1-24

I hope you understand what I’m asking.

Highlighted

Hello,

NM-HDV module supports a maximum of 32 HDLC channels with a bandwidth of 2

Mbps. So, when you configure timeslots, since you have already configured 24

slots on one card, you can at the maximum support 8 on the second.

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/hdd_vfnm.html

http://www.cisco.com/warp/public/cc/pd/rt/ps282/prodlit/guido_ds.pdf

Data Features (Only Supported on NM-HD-2VE)

. Support serial data WAN access using T1/E1 or fractional T1/E1 network

interface

. N X 64 Kbps or N X 56 Kbps channel group data rates (T1:N=1 to 24, E1:N=1

to 31)

. Supports up to 32 data channel groups with a total bandwidth of up to 2

Mbps

. Supports integrated data WAN access and DS-0 voice channels on the same

T1/E1

Hope this answers your questions.

Regards,

NT

View solution in original post

Highlighted

Thank you for explanation