How to split 4ch's of a T1 for a fax server?

[pbctech]

K, we have 6 T1's now going into our PBX but from there they get distributed through out the PBX onto both analog or digital line cards punched down all over the building with their own DNs right. How can I take four digital DN's and route them to a BrookTrout TR114P4V card ? I can't figure out the part of how only 4 'channels' of a T1 gets from the PBX to this fax server card.
Pls advise.
Thx

 

[wdhb]

Are you saying that you want to dedicate 4 T1 ch's to this, if so I don't think you can fractionalise incoming PSTN T1's. When you say you want to connect 4 dn's to the BrookTrout card, do you mean Meridian dn's or ddi numbers?

 

[PERRYPJ]

YOU NEED TO HAVE A DEDICATED T1 TO THE FAX SERVER, ALSO A BLOCK OF DID'S THAT ARE DEDICATED TO THE SERVER. THIS DEPENDS ON THE AMOUNT OF FAX USERS, ONE PER PERSON. THEN YOU CAN SENT UP DSC TO THAT T1

OLD ROLMEN WORKING ON NORTELS

 

[PERRYPJ]

THE ONLY OTHER WAY IS TO HAVE YOUR VENDOR SPLIT OUT THOSE CHANNELS WITH THE BLOCK OF DID'S, THEN YOU WILL NEED A MUX TO SPLIT OFF THE CHANNELS AND YOU WOULD ROUT THEM TO THE T1 TO THE FAX SERVER

OLD ROLMEN WORKING ON NORTELS

 

[pbctech]

Meridian DIDs, I would rather not use a T1 at all but we would require a PBX software upgrade to get DNIS off our analog lines so we went the way of a digital fax card. So am I going to more PBX hardware to get the 4 channels I need ? I can understand how a dedicated T1 directly attached to the fax server would work but not how to wire the box to our PBX with only the 4 channels. Right now the 6 T1's go through NT5D12AA boards, where would the fax server box plug into ?

 

[Cawho]

What is the fax servers interface for the incoming lines ?
Analogue or digital ?



Cawho
PBX.Tech

 

[JYJYJY]

Do you want to reserve 4 channels for just incoming fax? or just outgoing fax? or both?

For outgoing, you can create a trunk group with 4 channels (logical channels in T1s) that can only be accessible by the fax server.

For incoming, if you want a dedicate 4 channels (channel number)to fax server, it will require, as per PERRYPJ, the carrier to channelize your T1 pipe.

An alternative, you can use RTM size to achieve your objective. Assume you are using ISDN PRI in your 6 T1 group (all in one NFAS). There are 142 B-channels. You can put all your other voice DID/DNIS in one group (RTM 1) and assign 138 channels. Then put your fax DID/DNIS in another group (RTM 2) and assign 4 channels. What this means is that at any given point of time, the maximum voice connection can go up to 138 channels. The 139th voice call will get busy signal even if the rest 4 channels are available. Same for fax RTM with maximum only 4 channels. One thing to note is that you are not assigning a dedicating channel number to your RTM. It is only the maximum connection per RTM group. This setup can ensure that no matter how many voice traffic through your NFAS, you still have 4 channels reserved for incoming fax use. In this way, you don't need to change any T1 configuration, and physical connection to your M1.

RTM is restricting only incoming traffic, it has nothing to do with outgoing. RTM is set by the carrier. To get both incoming and outgoing, you need to do both of the above.

In this setup, your fax server will have its own DN from M1 (should be analog DN like the VM, unless your fax server require digital DN). You get one DID (or a group of DID) from carrier and program the M1 to only ring to your fax DN.