Specifications

Reference Guide 1-1
System Overview Introduction
Chapter 1
System Overview
1.1 Introduction
This chapter describes the various chassis models used by the integrated access system. It also
shows each chassis and the associated card slot locations.
Three series of chassis models are available. These include the front-loading chassis with
power supplies on the side; the front-loading chassis with power supplies on top, and the front-
and rear-loading chassis with power supplies on the side, also called the
two-sided
chassis.
The integrated access system uses four basic types of plug-in cards: common (CPU and
Interface); user (Voice, Data and Alarm); server (ADPCM); and WAN (for T1 or E1
networks). All cards slide into slots in front of a front-loading chassis, or into both sides of a
two-sided chassis. Card guides on the top and bottom of the chassis slots align the cards with
the connectors for easy insertion.
1.2 Chassis Types
1.2.1 Front-Loading Chassis with Power Supplies on the Side
Figure 1-1 shows a typical front-loading chassis with the power supplies on the side. Designed
to maximize the use of space, this chassis loads cards from the front, with the power supplies
on the right side. This chassis is made of steel and has punched-steel card guides.
This front-loading chassis has a common bus that allows all cards to be placed in similar slots.
The combination slots for this chassis are P1 to P4 and W1 to W4. These slots are also referred
to as slots U1 to U8 when used for voice, data, terminal interface, and/or alarm cards.
Table 1-1 lists the card slot locations for the front-loading chassis with power supplies on the
side. Refer to this table when determining your chassis card configuration.