Hey Everyone, I would like to start testing/playing with PRI channels but I don't have access to a PRI line. Is it possible to do the equivilent of a crossover between two PRI Cards (say Digium's TE120P)? What I was thinking is that I could set one asterisk box up with a PRI card set as the TE and provide clocking and another box exactly the same but with the card setup as NT. I think I would also need to wire up the correct type of crossover as a standard ethernet crossover would not work or would it? Thanks in advance. Lee
On Fri, 13 Feb 2009 09:18:49 +0000 (GMT), Lee Wilson <leefm40 at yahoo.co.uk> wrote:> Hey Everyone, > > I would like to start testing/playing with PRI channels but I don't have > access to a PRI line. Is it possible to do the equivilent of a crossover > between two PRI Cards (say Digium's TE120P)? > > What I was thinking is that I could set one asterisk box up with a PRI > card set as the TE and provide clocking and another box exactly the same > but with the card setup as NT. > > I think I would also need to wire up the correct type of crossover as a > standard ethernet crossover would not work or would it?Standard Ethernet crossover will not work. However, you can make a T1 crossover cable out of CAT-5 using a different pinout: http://www.ldfacts.com/faq_files/How-to-Make-a-T1-Crossover-cable.htm -- Alex Balashov Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 Mobile : (+1) (678) 237-1775
Hey Gordon, I was probably going with the Openvox anyway because they were cheaper. As this is just a hobby, no live environment I wanted to move away from just playing with SIP/IAX and get proper channels setup. I was inspired by any earlier test I did at my last company where I was able to get a Cisco BRI Router working though the Asterisk PBX using BRIStuff. When I get it going, I'll try to document the setup in case anyone is interested. Cheers Lee --- On Fri, 13/2/09, Gordon Henderson <gordon at drogon.net> wrote:> From: Gordon Henderson <gordon at drogon.net> > Subject: Re: [asterisk-users] PRI Test Lab > To: "Lee Wilson" <leefm40 at yahoo.co.uk> > Date: Friday, 13 February, 2009, 10:18 AM > On Fri, 13 Feb 2009, Lee Wilson wrote: > > > I just want to clarify before I got and buy anything > the cards are not so cheap. > > Hi Lee, > > I'm assuming you're in the UK from your yahoo > address (I'm in the UK too) > > I've installed a few boxes with these cards: > > > http://www.voipon.co.uk/openvox-d110p-pci-isdn-pri-card-p-658.html > > Not had any real issues with them and they're a bit > cheaper than the digium cards. > > (I've never used one as a clock master though - did > consider doing what you're doing before my first ISDN30 > install, but decided that as enough people were using them > and saying that they worked, that it should "just > work" and it did). > > Regards, > > Gordon > -- www.drogon.net
The cable needed for this is a different cable than an ethernet cross over.
I have actually done this same thing today with a Samsung 100 system and
Asterisk 1.4.20.1 and Zaptel 1.4.11 and things work great.
A question of my own:
I know I can emulate the network side of a pri connection, but can I do this
same trick with other t1 standards like ani and others?
If I can be a client on the different t1 types, does this also mean I can be
the server side and feed back the different standards to legacy equipment as
well or are there some limitations to this?
Thanks,
Tom
-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Lee Wilson
Sent: Friday, February 13, 2009 4:19 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] PRI Test Lab
Hey Everyone,
I would like to start testing/playing with PRI channels but I don't have
access to a PRI line. Is it possible to do the equivilent of a crossover
between two PRI Cards (say Digium's TE120P)?
What I was thinking is that I could set one asterisk box up with a PRI card
set as the TE and provide clocking and another box exactly the same but with
the card setup as NT.
I think I would also need to wire up the correct type of crossover as a
standard ethernet crossover would not work or would it?
Thanks in advance.
Lee
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On 2/13/09, Tom Moore <tommym2006 at gmail.com> wrote:> The cable needed for this is a different cable than an ethernet cross over. > I have actually done this same thing today with a Samsung 100 system and > Asterisk 1.4.20.1 and Zaptel 1.4.11 and things work great.I would again just recommend getting one of these, they are worth it: http://www.smartronixstore.com/index.cfm?fuseaction=product.display&Product_ID=9 (SuperLooper ISDN (PRI) Crossover Adapter)> A question of my own: > I know I can emulate the network side of a pri connection, but can I do this > same trick with other t1 standards like ani and others? > If I can be a client on the different t1 types, does this also mean I can be > the server side and feed back the different standards to legacy equipment as > well or are there some limitations to this?Yes you can do other T1/E1 standards like RBS D4/AMI, E&M wink start and most of your other old favorites MATT---
Lee Wilson wrote:> Hey Everyone, > > I would like to start testing/playing with PRI channels but I don't have access to a PRI line. Is it possible to do the equivilent of a crossover between two PRI Cards (say Digium's TE120P)? > > What I was thinking is that I could set one asterisk box up with a PRI card set as the TE and provide clocking and another box exactly the same but with the card setup as NT. > > I think I would also need to wire up the correct type of crossover as a standard ethernet crossover would not work or would it? > > Thanks in advance. > > LeeSince you have gotten plenty of responses on this I thought I'd throw out another option. If you just want to play with how a PRI connection behaves without all the hardware investment, you can emulate a PRI over TDMOE. I did it a while back just to see how calls were passed back and forth and how result codes were set. Everything is configured the same in asterisk, you just use a dynamic span instead of a physical one. You will still need one side to have a timing source (I did get mine to work with just ztdummy). -Dave