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Swapping PRI Channels (Voice/Data)

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bryandj23

IS-IT--Management
Aug 18, 2003
105
US
Hi All. Here once again with a stumper (at least for me).

I've got 2 magix systems connected via T1. The T1 is broken out for 5 channels voice, the remaining 18 for data. Those here who remember who I am will probably remember helping me out with getting this originally set up a few years ago (and much thanks again).

We have more people working at our remote office, and lately we've been having some trouble routing calls. A print of the error log shows frequent POOL BUSY entries, so I think I need to switch 2 more channels from Data to Voice.

I figured this would be pretty simple; remove two channels from the Data Port, remove those channels from the CSU assignment (100DCD board), then go over to Lines/Trunks, add those two channels to the B-Channel Group 80, and add lines to the B-Channel Group as well. Now, add those two new lines into pool 891, and all should be good, right?

Well, first (and not thinking clearly), removing the data channels IMMEDIATELY killed the data link. Makes sense, I know. I proceeded configuring our main site...moving those two channels over to voice; then drove to our remote site.

I configured that site exactly the same way, but could not for the life of me get the data link to come up. (Cisco 1700 series routers on the Data Ports). I checked and checked again that everything was the same on both Magix, and they were. I still received "Line Protocol is down" on both Ciscos.

So, I reset everything to the way it was before. Drove back to the main office to do the same, and the data link came back instantly. This makes me wonder if maybe there's something I have to re-configure on the Ciscos? I wouldn't think so, since these are serial interfaces and they're just passing data to the DSU.

One other strange note; while at the remote office, when I tried to "Deactivate DSU" in an attempt to reset it, it wouldn't deactiviate. I just kept getting a "BEEP" in WinSPM and it would revert back to "Activated".


So, I'm at a point where I'm not sure if it's our Magix or our Cisco's causing this problem.

Anyone have a little bit of insight, or ever have to deal with adding/deleting voice/data channels?

Thanks again guys!
 
Just wanted to add...

I verified that the two ports I moved from "data" to "voice" did in fact work; a user in the remote office called an extension in the main office, and "DATA 1" displayed on his phone (the label I made for that trunk).

It's almost like there may have been a timing issue once I reduced the amount of "data" channels. I'm stumped.
 
I'm going to give this a try after hours tonight. I still believe it's a csu/dsu issue, and I probably just didn't give things enough time to sync up?

If someone could at least verify these steps (that they're in the right order), I'll feel a bit more confident.

1. Remove Channel 6, then Channel 7 from Data Port 1
2. Remove Channel 7, then Channel 6 from CSU
3. Inspect CSU, verify Channels 6 and 7 so "U"
4. Add 0306 and 0307 to B-Channel Group 80.
5. Assign lines 8116 and 8117 to B-Channel Group 80.

Repeat for other side of network.

This should be all that's needed to move 2 channels from data to voice, correct? The Data Ports should sync sooner or later, I'd assume.

I'll log back in Saturday morning to see if the data link has come back up.
 
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