User`s guide

Allworx Server Administrator’s Guide Version 7.6
Page 112 1-866-ALLWORX * 585-421-3850
www.allworx.com
Revised: 11/22/13
13.4.3 PRI Support
The Allworx server supports Primary Rate ISDN using the National Standard ISDN
format (NI-2), Lucent Custom 4ESS, Lucent Custom 5ESS, and Nortel DMS-100 switch
types.
Always configure the Allworx server ISDN interface as the user side equipment with the
intention of hooking to the service provider’s Central Office (CO) network side
equipment. The Allworx server interfaces have a fully integrated CSU/DSU and typically
intended for a direct, short haul connection to the service provider smart jack. Consult
the product installation instructions for further information.
13.4.4 NFAS Support
Non-Facility Associated Signaling (NFAS) is a PRI that multiple T1 lines share the same
D channel. The Allworx server supports NFAS using the National Standard ISDN, Lucent
Custom 4ESS, Lucent Custom 5ESS, Nortel DMS-100 switch types.
13.4.5 Robbed Bit Signaling (RBS) or Channel Associated
Signaling (CAS) Support
The Allworx server supports classical T1 Robbed Bit Signaling (RBS) trunk lines on a
time slot by time slot basis. Sometimes referred to as T1 Channel Associated Signaling
(CAS). The system supports the following modes:
• FXO Loop-Start
• FXO Ground-Start
• E&M Wink Start
• E&M Feature Group B
• E&M Immediate Start
Note:
When using PRI operation it is important to define exactly one PRI D channel for the
Digital Line and a minimum of one PRI B channel. The configuration must match the
provisioning defined by the Central Office with a typical configuration having 23 B
channels on slots 1 through 23 and one D channel on slot 24.
Note:
The configuration must match the provisioning defined by the Central Office. A typical
configuration has 23 B channels on slots 1 through 23 and one D channel on slot 24 of
the primary T1 line, plus 24 B channels on slots 1 through 24 of the secondary T1 line. To
configure NFAS on the Allworx system, connect the NFAS line with the D channel to the
T1-A port.