T1 Circuit Emulation

[Patrick McHenry]

Hi,

we are trying to configure a 24 port channelized T1 SPA card for PBX communication across the WAN.

To get started we need to figure out how to configure the card to communicate with the headend PBX. Then, we can focus on how to transport it across the WAN.

Any body done this before? Any good docs?

Thanks you, Pat.

[paolo bevilacqua]

Normally, it is not necessary to try "circit emulation". For example, for a legacy PBX you can use a regulat T1 CAS configuration. I recommend you engange a reputable consultant or UC certfied Cisco partner for the job.

[Patrick McHenry]

Paolo -

Sorry for the vague question.

At the headend we have a Nortel 81C that will connect to a ASR 1006 and the 1006 over a MPLS circuit to a 1002X which, will the connect to another Nortel 81C.

The 2 Nortels communicate over an existing point to point circuit provided by the local LEC using Nortels proprietary point to point signaling. We want to emulate they point to point LEC circuit.

Thank you, Pat.

[paolo bevilacqua]

The question is not vague. What I'm trying to tell you is that there is no point in trying to "emulate", but simply do a regular VoIP configuration that works in all cases. If the signalling is is proprietary, you can use TCCS to transport it.

Thank you for the nice rating and good luck!

[Patrick McHenry]

Thank Paolo,

The TCCS will create the tunnel between the two T1 WICS?

Notel 81C PRI <-------> Cisco 1006 T1WIC ---- MPLS over Ethernet ---- Cisco 1002 T1 WIC <------> Nortel 81C PRI.

The two Nortel systems need to have this act like a land based Point to Point PRI where the D Channel will pass the SL1 protocol (not NI2) and the calls will traverse the PRI.

Channel 1-23 will be B and the channel 24 will be the D Channel.

Pat

[paolo bevilacqua]

Yes. Once again if you want sure and quck results give the job to a repuable consultant and avoid yourself much time loss and frustration.

[Patrick McHenry]

But I'm a glutton for punishment OK, Paolo you are probably right about getting a consultant but, just so I understand:

This implementation can be done using TCCS and there is no need to emulate the T1 circuit....even over an MPLS Ethernet circuit?

We purchased Cisco 24-port Channelized T1/E1/J1 Circuit Emulation Network and ATM Shared Port Adapters. Is this the correct product for the job?

Also, I googled Cisco TCCS and got nothing.

Thank you.

[paolo bevilacqua]

No, it is not the correct product because it works over ATM only, not IP/MPLS.

You can do that simply as I indicated above with VoIP and TCCS.

That's why I stress the importance of not trying to do oneself things that require experience and professionalism, to avoid costly mistakes, and get sure and quick results instead.

[Patrick McHenry]

Alright Paolo - one more stupid point from me..........you've convinced me on the consultant thing BTW and that I know nothing about this topic.

I just want to make sure that you understand that we are talking about digital phones here and not IP.

Also, what product is needed to accomplish the VOIP and TCCS implementation?

Could you please provide a link for this technology? I just want to understand what you are talking about. I can't find anything on it.

Thank you.

[paolo bevilacqua · Accepted solution]

We are talking about connecting two legacy PBXs over MPLS using VoIP. But I had missed in your first post that you bought the ATM CES card, otherwise I would told you that it can't work since the beginning.

If you enter Transparent CCS in cisco.com search box you will find all the information on the subject.

[Michael Seden]

In our lab I have 2 routers with a T1-CSU/DSU card in them. To emulate a serial connection I made a T-1 Crossover cable.

The pinning is different,but the 2 routers think they have a serial connection.

Don't know if this will help, but...

[Patrick McHenry]

Thanks Michael - ya I've done that as well for testing. I have a handy T1 crossover for that.