atcomsystems.ca/forum Forums TDM Business Telephone Systems Nortel Telephones & Systems VTC connection through SL100

I have been tasked to program the switch to dedicate 3 DS0 commercial ISDN trunks to a VTC bridge. I have been told that unless you are an SL100 guru to not attempt this. That is not an option as my boss specifically stated 3 DS0 trunks. Any help in this would be greatly appreciated.

to the board, scracer1

As one whom is not an SL100 technician, but does assign VTC circuits in 5ESS, I have a general question regarding the information that was provided to you by your boss:

If the boss is actually implying 3 trunks at the DS0 level, those 3 trunks would provide a maximum combined bit rate (bandwidth) of only 192kbps, resulting in very poor, "choppy" VTC call quality, and for no more than 1 VTC call at a time. Even though VTCs can connect at bit rates as low as 128k (or possibly even 64k); in most areas, the minimum bit rate standard for a decent quality VTC call is 384k and higher. I'm familiar with requests for provisioning 3 separate 128k ISDN BRIs (achieving a combined bandwidth of 384k thru inverse multiplexing), or for three separate ISDN PRIs; which makes the most sense to me when connecting an end office such as an SL100 to a video conference bridge. However, I simply can't understand any reason behind allocating only 3 commercial DS0s to interface an SL100 with a VTC bridge.

I strongly recommend identifying, and contacting the manufacturer of the VTC bridge that you will be interfacing the SL100's trunks with, and discuss this further with them. Many VTC (and standard conference) bridge manufacturers will provide "switch-specific" documentation to their conference bridge installers, for assisting end office technicians with interfacing trunks with their VTC bridges.

I hope this can be helpful.

Mike you are the best.

Thank you for the great compliment vad60, but in truth, the valuable members here at Sundance Communications are the best. Trust me, posting here in Nortel is strange territory for me, and it's an honor just to be able to offer some input. :bow: :bow:

scracer1, So many times in this industry, terminology tries to get in the way. While preventing putting you in an uncomfortable position with your supervisor, we're simply requesting confirmation of the information that was communicated to you. Hopefully it's a simple matter of our misinterpretation of the precise terms used in the request from your supervisor.

After much back and forth and research I believe he meant to say 3 BRI's. But after looking up the specs on the network interface (Polycomm MGC+ NET-2 H.320 ISDN) they specifically state ISDN (PRI) Leased (T1/E1).