Administrator's Guide

ISDN service
Issue 5 October 2002 1731555-233-506
■ Lookahead Inteflow
■ Lookahead Routing
■ Usage Allocation
Screens used to administer ISDN
See Access Endpoint to administer Access Endpoints and Wideband Access
endpoints.
See ISDN trunk group for detailed information on the fields used to administer:
— Supplementary Service Protocol (supports public network
connection)
— Calling Number (supports CPN)
— Incoming Call Handling Treatment Table (supports digit
manipulation, CPN or BN requests, and night service destinations)
— CBC Trunk Group Usage Allocation screen (supports Call-by-Call
Service Selection Usage Allocation Plans)
— CBC Trunk Group Allocation Plan Assignment Schedule (supports
Call-by-Call Service Selection Usage Allocation Plans)
— Wideband Support Options (supports Wideband Switching)
See ‘‘ISDN Numbering — Private’’ to administer private numbering plans.
See ‘‘ISDN Numbering — Public/ Unknown’’ to administer ISDN call
identification displays.
See the DEFINTY services documentation for information about the following
screens: ISDN TSC Gateway Channel Assignments, Network Facilities (supports
usage allocation used in Call-by-Call Service Selection), and Signaling Group
(used to define a group of B-channels for which a given D-channel or D-channel
pair carries signaling information).
Transmission rate and protocols
In ISDN-PRI, the transmission standard for layer 1 (the physical layer) is either
DS1 T1 or E1. The DS1 T1 (used in North America and Japan) is a
digital-transmission standard that carries traffic at the rate of 1.544 Mbps, and the
E1 (used in Europe) carries traffic at a rate of 2.048 Mbps. The “D” (data) channel
multiplexes signaling messages for the “B” (bearer) channels carrying voice or
data. In a T1, when a D-channel is present, it occupies Channel 24. In an E1, when
a D-channel is present, it occupies channel 16.