I have an issue with some T1s that connect to an Opt 81. These T1s ride on a point to point DS3 between our two sites. At site A we have a Rockwell Spectrum and at site B we have the Nortel. For some reason when the DS3 experiences an outage the T1s will come back in service on both ends but the channels are in a disabled state on the Nortel. This requires that we cycle the T1s on the Nortel in order for them to go idle. Anybody have an idea?
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T1 channel issue. Need advice.
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All of our T1s are set to service restore. The problem exists at the channel level. Remember, these T1's ride a point to point D33 and the DS3 has a habit of going down in the network. When it does this, the T1s come back in service but the individual channels are disabled. When this happens we have to manually cycle the T1s to bring the channels in service. I changed the threshold set on one of the T1s hoping that is where the problem lies. If you have any other ideas please let me know. Thanks.
enrightdj
Technical User
- Sep 7, 2003
- 73
The DS3 will not prevent your channels from going idle. DS3's are used to transport T-1's.
Once your DS3 comes backup, are you taking errors on the T-1's that ride the DS3? Check your DDB on both sides for clocking issues. What is your primary clock source on both sides? Ensure you are not setup to cause a clocking loop.
Once your DS3 comes backup, are you taking errors on the T-1's that ride the DS3? Check your DDB on both sides for clocking issues. What is your primary clock source on both sides? Ensure you are not setup to cause a clocking loop.
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These are inband T1s, no D channel involved. I have 17 T1s that connect to the Nortel that ride a point to point DS3 where the same 17 T1s connect to a Rockwell Spectrum at the far end. The primary and secondary clocks aren't one of these 17. The primary goes to Bellsouth and the secondary goes to ATT. Thoughts.
enrightdj
Technical User
- Sep 7, 2003
- 73
You have an M13 mux at each location, this interfaces with the network element that is providing the DS3. What is the timing source on the M13? Are your pt-pt T's timed off of the M13? Your T-1's in the switch's are timed off of you local and long distance provider. Do the local and LD T's ride the same DS3? Are you using one of the PBX's as a tandem switch (all LD calls go through one switch)?
What type of M13 are you using?
An M13 mux's a DS3 into 28 T-1's or DS1's or vice versa.
What type of M13 are you using?
An M13 mux's a DS3 into 28 T-1's or DS1's or vice versa.
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These are ADTRAN 2800 mux's. The T1's themselves come up fine. It's the individual channels that don't come up. When the DS3 goes down the T1s come up but the channels are disabled. Each switch has a primary and secondary clock source. One connects to AT&T and the other to the local lec and the do not ride on the point to point DS3. The 17 t1s are used for intersite dialing.
enrightdj
Technical User
- Sep 7, 2003
- 73
Try using one T-1 for a clock source. The Nortel local span as primary. Have the Rockwell use one of your pt-pt spans as a primary. On the Rockwell, set their local T-1 as the secondary source. By doing this you will be using 1 T-1 for a clock reference.
I beleive that you could be having a timing issue when your DS-3 comes back up. Therefore, your channels are not going active.
I beleive that you could be having a timing issue when your DS-3 comes back up. Therefore, your channels are not going active.
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Hey let me ask you a question about T1's. I'm trying to connect a new Fax server box to our Meridian 61C PBX and it requires a T1. What do I need for PBX hardware (if any) to set this T1 up for four channels to my fax box? I can reprogram the PBX but am not sure if I can use our exixting T1 setup or dedicate another T1 just for four channels, where's the connector come from?
Any help would great.
Thx
Any help would great.
Thx
you would have to channelize your T1 to use less than the 23/24 ports. A regular NT5D12AG card will suffice in providing you a link to your Fax Server. You would program up like any other T1, matching the protocols in your Fax Server.
John
John
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. Why can't I take four digital DN's and route them to a BrookTrout TR114P4V card ? I can't figure out the part how only 4 'channels' of a T1 gets from the PBX to this fax server card.
Pls advise.
Thx
Pls advise.
Thx
pbctech:
Quick answer to your questionalthough LDs may be different as I am using a 11c, use a TI/PRI card to make the connection to your fax card. Brooktroute has the manuals online for how to configure your signaling. When setting up the TNs in LD14, only configure 4. When you check the setup in LD 60, you will see 4 channels idle, the rest will be UNEQ.
Quick answer to your questionalthough LDs may be different as I am using a 11c, use a TI/PRI card to make the connection to your fax card. Brooktroute has the manuals online for how to configure your signaling. When setting up the TNs in LD14, only configure 4. When you check the setup in LD 60, you will see 4 channels idle, the rest will be UNEQ.
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