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ADCP-75-192 • Issue 1 • December 2005 • Section 1: Overview
Page 1-12
2005, ADC Telecommunications, Inc.
3.7.2 System Interface (STF2)
The STF2 module provides the ability to communicate between the CPU and other modules
(RDC, RUC, RFA interface controller) using four I2C busses. The STF2 also contains the GPS
module.
3.7.3 Sonet Interface (SIF)
The SIF module provides the optical interface between the Hub and RAN’s. The SIF has an
optical transceiver module installed that provides the optical transmit and receive functions.
The SIF has also the following functions:
1. Digitized RF Signal information.
2. 10 BaseT Ethernet for command and control between Hub and the RANs.
3.7.4 Small Form-Factor Pluggable (SFP) Optical Transceiver
The Small Form-factor Pluggable (SFP) optical transceiver module provides the optical
interface between the Hub equipment and the RAN hardware. The SFP has a laser transmitter
and optical receive detector. The Digivance CXD uses industry standard SFP optics which
offers a number of configuration options depending on the requirements of the project. The
SFP modules are available separately and may or may not be initially installed in the SIF
depending on the configuration ordered.
3.7.5 RAN Down Converter (RDC or RDC2)
The RDC is a dual-diversity wideband receiver that converts PCS, Cellular, SMR A and SMR
B signals to digitized IF. It also includes a CW test tone used in reverse continuity testing.
3.7.6 RAN Up Converter (RUC2.X or RUC3)
The RUC converts digitized IF into PCS, Cellular and 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.
3.7.7 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.
3.7.8 AC Power Entry Card (APEC)
The APEC distributes AC power to the cPCI power supplies in the RAN. Its input range is
100 to 240 VAC. It has a built in EMI filter and fuse holder and provides an access point for
fan monitoring and control.