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ManualsBrandsADC Telecommunications ManualsElectronicsDigivance CXD 1900 MHz EFC Band System
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ADCP-75-192 • Issue 1• December 2005 • Section 1: Overview
Page 1-11
2005, ADC Telecommunications, Inc.
1. Interface to a low power forward BTS RF path.
2. Handles duplexed and non-duplexed signals.
3. Gain adjust for optional reverse path configurations.
The BIM is controlled via an I2C connection from its respective CPU.
3.6.11 Hub Reference Module (HRM)
The HRM generates the RF reference and fiber clocking for distribution within the Hub. In
addition, it contains a GPS that generates a 1 PPS (one pulse per second) for distribution to the
Digital Chassis modules for delay management.
3.6.12 Ethernet Hub
Each Hub rack is equipped with a 24 port Ethernet Hub. It is powered by 120 VAC, or optional
–48 VDC can be chosen. The Ethernet Hub is used to connect RAN CPUs (through Hub SIFs)
and Hub CPUs to and existing LAN/WAN and to each other.
3.7 RAN Subsystem Assemblies
The RAN consists of a cabinet, RAN Chassis and Backplane, a Central Processing Unit
(CPU), a System Interface (STF2), a Sonet Interface (SIF), RAN Down Converter (RDC or
RDC2), RAN Up Converter (RUC2.X or RUC3), AC Power Entry Card (APEC) or DC Power
Entry Card (DPEC); and the RF Assembly consisting of Power Amplifiers, duplexers, and
RFA interface controller. There are two cabinet options: the Standard CXD RAN Cabinet and
the Extended CXD RAN Cabinet. The standard cabinet supports two Radio Frequency
Assemblies (RFA) with no battery backup; or one RFA and one internal battery backup
assembly. The extended cabinet supports two RFA's and an extended battery backup assembly
housed in a battery compartment located on the side of the cabinet.
The Digivance CXD cabinet houses the RAN components and can be mounted from a flat-
vertical surface or from a utility pole using an accessory pole-mount kit. Within the enclosure
space is provided for storing short lengths of excess fiber slack.
3.7.1 Central Processing Unit (CPU)
The RAN has a cPCI based single-board computer with a Central Processing Unit (CPU)
operating LINUX. The RAN CPU provides the following functions:
1. Manages all RAN hardware including RF and Digital equipment
2. Manages gain & delays
3. Monitors signal presence and quality
4. Ethernet interconnect
5. Generates SNMP traps based upon fault conditions