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 This page is taken from the Installation Guide, which is available for download.

See also:
Provisioning information for ISDN PRI
Provisioning information for Channelized T1 (Robbed bit)
Provisioning information for Analog Line


This page assists you in ordering an ISDN PRI or a T1 line for your Dialogic Diva PRI Media Board. It provides recommended settings for a number of the configuration settings on Diva PRI Media Boards. You should specify these settings when you order your line from your service provider.

Line types 

Diva PRI Media Boards can be configured to support an ISDN PRI line or a T1 line. 


In North America and Japan, an ISDN PRI line typically supports 23 B-channels and one D-channel. PRI configurations are used to receive multiple, simultaneous ISDN calls from analog-modem and digital-services dial-in traffic. Another common use of ISDN PRI is to connect a PBX (Private Branch Exchange) to a central office switch. 

Channelized T1 (robbed-bit signaling) 

Robbed-bit signaling, which uses bits from specified frames in the user data channel for signaling, fits into the in-band signaling category. In this scenario, bits are ‘stolen’ from each channel for signaling purposes, as opposed to ISDN PRI (out-of-band signaling) which dedicates a specific channel (D-channel) to signaling. 

Connecting to a PBX 

In some installations, the PRI or T1 line is connected to a PBX instead of the Dialogic Diva PRI Media Board. In these cases, you must correctly configure the PBX to communicate with the Diva PRI Media Board. 

Power Supply 

When ordering your ISDN PRI or T1 line, make sure that a power supply is available for the NT1 of this line. Usually, a PBX is installed in the same area as the NT1 and the telephone company can use the power supply of the PBX for the ISDN PRI or T1 line as well. If this is not the case, you have to order a combo device from your local telephone company. This device consists of an installation rack into which an NT1 module and a power supply module is mounted.

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