User Manual

ADCP-75-192 • Issue D • October 2005 • Section 1: Overview
Page 1-7
 2005, ADC Telecommunications, Inc.
3.6.1 Central Processing Unit (CPU)
The RAN has a cPCI based single-board computer with a Central Processing Unit (CPU)
operating LINUX. RAN CPU:
1. Manages all RAN hardware including RF and Digital equipment
2. Manages gain & delays
3. Monitors signal presence and quality
3.6.2 System Interface (STF)
The System Interface (STF) module provides the ability to communicate between the CPU and
other modules (RDC, RUC, RIC) using four I2C busses. The STF also contains the GPS
module.
3.6.3 Sonet Interface (SIF)
The Sonet Interface module provides the fiber interface between the Hub and RAN’s. This
interface includes:
1. Digitized RF Signal information
2. 10 BaseT Ethernet for command and control between Hub and the RAN’s.
3.6.4 RAN Down Converter (RDC)
The RDC is a dual-diversity wideband receiver that converts PCS, Cellular and SMR800
signals to digitized IF. It also includes a CW test tone used in reverse continuity testing.
3.6.5 RAN Up Converter (RUC)
The RAN Up Converter converts digitized IF into SMR frequency bands. Each RUC supports
two simultaneous bands via wideband outputs. The RUC also provides clocking for its
neighboring RDC’s as well as extends an I2C interface to its respective RFA.
3.6.6 RAN Chassis & Backplane
The RAN chassis is a six slot CompactPCI unit. The backplane supports the basic CompactPCI
functions and has been extended to allow the routing of DIF, reference clocks and I2C signals
between CompactPCI modules.
3.6.7 AC Power Entry Card (APEC)
The APEC distributes AC power to the cPCI power supplies in the RAN. Its input range is
100 to 260 VAC. It has a built in EMI filter, fuse holder and off/on switch.