Zhone Technologies 900, 800, 600 manual Definitions, ISDN-PRI Card Introduction, Timeslot, 1.2 DS0

ISDN-PRI Card Introduction

Chapter 5

ISDN-PRI Card

5.1Introduction

The ISDN-PRI server card (884060) offers users the ability to effectively terminate and manage both dedicated and switched carrier services in a single system. This capability allows users to pick the most cost-effective services for both permanent connections (e.g., LAN-to-WAN) and periodic connections (e.g., video conferencing).

Three specific features enable the system to use ISDN-PRI services, and are therefore covered in this chapter. These features are:

•ISDN PRI server card

•Call profiles (accessed from the Interface Card)

•HSU-AD 530/35 switched services data 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 cross-connect circuits (see Chapter 4, System Configuration and Operation, in the System Reference Guide).

Server Cards 5-1