User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 2: Description
Page 2-2
 2005, ADC Telecommunications, Inc.
2 DIGITAL CHASSIS
The Digivance Digital Chassis is a rack-mounted cPCI shelf capable of housing 8 industry
standard cPCI circuit card modules. The Digital Chassis houses cooling fans and specific
modules designed for use in the Digivance CXD system. The backplane of the Digital Chassis
provides for distribution of signals between modules including the reference clock,
communications, control and data signals. Modules used in the Digital Chassis include the
CPU module, System Interface module (STF2), and up to six Reverse Simulcast Cards (RSCs)
or Sonet Interface (SIF) digital modules.
Figure 2-1 shows the empty Digital Chassis. The eight empty slots on the left are used for
Digivance CXD Hub modules. The slots on the right are used for housing the cPCI power
supplies and cPCI fan assembly.
Figure 2-1. Digivance CXD Digital Chassis
Modules and circuit cards are placed into the Digital Chassis and are mated to standard cPCI
connectors on the backplane of the chassis. Data and signals are transported over busses on the
backplane of the chassis to other modules and ports on the backside of the chassis.
Rear connections are made to the Digital Chassis to connect power, route DIF signals to inputs
and outputs of respective modules mounted in the chassis, connect the I2C bus to the chassis,
input a 1 Hz reference signal, input a sample clock, input FAN tachometer readings from the
RF Chassis, and distribute 12 VDC to other elements of the system. The Digital Chassis also
has a Module/Port status indicator that can be used to trace signals through the system and
show activity on the ports. Figure 2-2 shows the back panel connections for the Digital
Chassis. The references for the back connectors of the Digital Chassis are shown in Table 2-1.