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Split a full P2P T1 with only Cisco equipment

jomar050485
Level 1
Level 1

It is my understanding that if I have a P2P T1 between two locations going into a VWIC-2MTF-T1 card, i can split the T1 to be able to use it for voice and data.

I require both a P2P and PRI between the location. They don't have enough traffic to warrant a full T1. I thought I can split the T1 in half and use half the time slots for data and the other half for a PRI hand off to the PBX on both sides.

I know this can be done with an Adtran but I want to avoid using them.

I am wrong in thinking I can do this? I found this discussion and it appears to be what I need. https://supportforums.cisco.com/thread/300546

The last comment has the following config:

!

network-clock-participate wic 0

network-clock-select 1 t1 0/0/0

!

controller T1 0/0/0

description - connection to service provider

framing esf

linecode b8zs

channel-group 0 timeslots 1-12 speed 64

tdm-group 1 timeslot 13-24

!

controller T1 0/0/1

description - trunk to PBX

framing esf

clock source internal

linecode b8zs

tdm-group 1 timeslot 13-24

!

interface Serial0/0/0:0

description - data conection

ip address 1.0.1.1 255.255.255.0

!

connect 1 T1 0/0 1 T1 0/1 1

Is that what I need to do or am I barking up the wrong tree?

9 Replies 9

paolo bevilacqua
Hall of Fame
Hall of Fame

Yes it is possible, but it is not a great solution because it will waste half T1 for voice that may not be there all time.

Instead, if you use VoIP, then you data will be able to use T1 or whatever remaning bandwidth, and the voice to use as many channels you want. Note that users will be unable to tell that their voice or fax goes over IP, as everything will work transparently.

ha i saw someone ask a similar question and you responded the same way. unfortunatly, the PBX was selected already and I have to meet these requirements. I rather use VOIP but the client invested in older technology to save money.

So I am correct in assuming that the configuration above with split the T1 and use half the channels for data and passthrough the other channels for Voice between the PBX?

Thanks for your help..

Maybe if I did not made myself clear, my answer already assumes that you have two legacy PBX that will not replaced.

So to sum up:

If you dividide the T1 statically as you mentioned, you will have to buy two Cisco pieces of equipments, and incour the disavantages I have mentioned before.

If you use VoIP transport, you will have to buy the same two Cisco devices, but with DSP added, and you will get the advantages mentioned, namely virtually T1 bandwitdh available to data traffic.

Well I NEED to hand off a PRI.

What two pieces do I need? Don't I just need a router with a dual port MF T1 card on each end?

Well I NEED to hand off a PRI.

Correct, both the TDM and the VoIP solutions, wil "hand off a PRI'"

What two pieces do I need? Don't I just need a router with a dual port MF T1 card on each end?

2 routers and cards == 2 pieces of equipment. Note if you use older router, and VWIC 1st generation, you will need to more expensive DI version for TDM.

jomar050485
Level 1
Level 1

Just to clarify what i need to do, I have two offices connected with a full T1 P2P. Each side has a PBX than needs a trunk between them to communicate. Instead of going with a full PRI, we are going to split the P2P T1 so that we can use the single circuit for both data and voice.

I believe with the configuration posted in the original post will allow me to do that. I will plug in the P2P T1 in the first port and the PBX on the second port. The other side will be configured the exact same way.

The PBX can then use half the channels to communicate to the other PBX on the other side using the allocated channels.

Is this true?

jomar050485 wrote:

Just to clarify what i need to do, I have two offices connected with a full T1 P2P. Each side has a PBX than needs a trunk between them to communicate. Instead of going with a full PRI, we are going to split the P2P T1 so that we can use the single circuit for both data and voice.

I believe with the configuration posted in the original post will allow me to do that. I will plug in the P2P T1 in the first port and the PBX on the second port. The other side will be configured the exact same way.

The PBX can then use half the channels to communicate to the other PBX on the other side using the allocated channels.

Is this true?

Answered in my first reply fo this thread.

Well you said yes it's possible. You didn't say yes that's the approriate configuration. I am still unclear if what i have is the correct way to do what I want to do.

For TDM to work, ou will need to make sure that PBX and router use the same set of channels. So it depends by the PBX configuration, where you will have to limit the number of channels. All in all, a specialist's job.

Note this issue does not exist when doing VoIP, because the PBX would have all the channels available.

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