| Introduction |
Chapter 5
ISDN-PRI Card
5.1Introduction
The
Three specific features enable the system to use
•ISDN PRI server card
•Call profiles (accessed from the Interface Card)
•
The switched services HSU card information is repeated in the chapter on HSU cards, and the call profile information is repeated in the Interface Card chapter.
5.1.1Definitions
5.1.1.1Timeslot
Each T1 or E1 WAN link accessed by the system is subdivided into individual 64 kbps channels called timeslots (T1 has 24 timeslots, E1 has 32). A timeslot is sometimes also called a DS0 or a B (bearer) channel. While all three terms refer to the same concept, this manual will assign arbitrary definitions to distinguish timeslots controlled by ISDN from those that are not.
5.1.1.2DS0
A DS0 is a timeslot on any WAN link that is not controlled by an ISDN signaling channel (the D channel). Thus, DS0s are controlled via assigning user ports to WAN timeslots (see individual user card chapters) via setting up
Server Cards |