Specifications

Reference Guide
5-1
CPU Card Introduction
Chapter 5
CPU Card
5.1 Introduction
The CPU is the “brain” of the Integrated Access System and performs most of the
configuration, management, and common processing for the system. In addition the CPU card
provides the interconnection of WAN/User/Server Pulse Code Modulation (PCM) buses
through a bus connect or cross connect function. The Integrated Access System can have up
to 2 CPU cards which provide a redundant control and switching complex. If the primary CPU
fails, the standby takes over. A Mini-DACS 1/0 cross-connect for 256 DS0s is available.
5.2 CPU Card Descriptions
5.2.1 CPU XCON (8803)
The CPU XCON card controls the integrated access system. It performs the following
functions:
•
Initializes the system upon power-up, and runs a self-test on all cards plugged into the
chassis at that time.
•
Polls all cards in the system every second to determine their operating status.
•
Processes all incoming operator commands and displays the responses in a series of
operator interface screens for each card in the system. The operator interface system
(local VT-100 terminal, remote computer, or network management system) connects to
the Interface card, which sends these commands to the CPU card for processing.
•
Includes circuitry that allows you to cross-connect DS0 time slots between T1 and E1
lines connected to the system WAN cards. Refer to the DS0 time slot assignment
operations.
•
Includes a test pattern generator for T1 and E1 line test purposes.
•
Performs primary-secondary CPU arbitration. In a system with redundant CPU cards, the
two CPU cards communicate their status to each other. If the primary CPU card fails, the
redundant card takes over and becomes the primary.