Overview of ISDN

The IMG supports (ISDN) Integrated Services Digital Network for a complete digital telephone/telecommunications network which will carry voice, data, and video over an existing telephone network. The IMG supports 128 Kbps high-speed and high-bandwidth service. ISDN non-compressed (512 Kbps compressed) can also provide on-demand service and can connect up to eight devices simultaneously with each device being call-managed.

National ISDN PRI (NI2)

The IMG supports National ISDN PRI (NI2).

 

IMG 1010:

The IMG supports one D channel per span [Facility Associated Signaling (FAS)], or one D channel managing up to 20 spans [Non-Facility Associated Signaling (NFAS)].

 

IMG 1004:

The IMG supports one D channel per span [Facility Associated Signaling (FAS)], or one D channel managing up to 4 spans [Non-Facility Associated Signaling (NFAS)].

 

Connection endpoint variants are defined for National ISDN as User side and Network side. You can intermix both FAS and NFAS D channels with each supporting a different variant. See "Configuring ISDN signaling" for more information