atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems How to: Program PRT Clock Slip timing?

Was wondering if anyone here has any documention on which memory blocks / minimum software level on any of the 48/192/IPK KSU's from NEC on how to go about programming the proper PRI Clock Slip timing to match the T1.

Example:

In the field if you try to dialup to a NEC KTS that utilizes PRI trunks, if you get sporadic baud rate connections, random disconnects, etc, then this is due to the PRI Clock Slip timing not matching the telco.

Someone showed me where this was before in the past but I am looking for this information once again. Once you rectify the PRI Clock Slip timing, no more phantom disconnects and the modems always synch at the same speed.

PS - I looked at the Progman_7(Electra Elite 48192 Programming Manual - Issue 7 (S8000)).pdf and it's not defined. I think it's hidden. Either that, or I am blind!

Thanks!

[This message has been edited by ClassOfService (edited August 03, 2004).]

Check out the hardware manual , it shows dip switches that apply to timing. There aren't any programming settings that I am aware of related to timing.

Ok, I found it...

It's memory block 1-8-33:

8.3.11 Master Clock Selection (Memory Block 1-8-33)

Use this Memory Block to assign the source for synchronization of the clocking for DTI-U10/20/30, PRT(1)-U10/20, or BRT(4)-U10 ETU.

Default: 0 (Not assigned)

Related Programming:

Memory Block 7-1: Card Interface Slot Assignment

Once you've got the proper configuration setup modem connections via CoSession should work flawlessly!

Thanks for reminding me of this setting. Our PRI system was having a lot of trouble pumping data through the channels (running some fax servers through the PRI).

Our modems were having problem connecting and finishing transfers, but after setting this MB, it worked flawlessly.

Thanks again.