User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 1: Overview
Page 1-2
 2005, ADC Telecommunications, Inc.
2.1 Basic Components
Figure 1-1 illustrates a Digivance system with RAN’s distributed over a desired geographical
area, connected back to a Wireless Service Provider (WSP) base station(s) at a Hub locale. The
illustration shows a dual-band SMR A and SMR B configuration with variable digital
simulcasting as a reference. The Digivance CXD Hub equipment consists of a rack assembly
containing RF Chassis and Digital Chassis equipment, high power attenuators, base station
interface modules, power distribution unit, Ethernet hub, Hub Reference Module and other
material sufficient to provide the interconnection at the RF layer between the base station
electronics and the Digivance CXD RAN’s located in the field.
CXD
RAN 1
SMRA/
SMRB
CXD
RAN 2
SMRA/
SMRB
CXD
RAN 3
SMRA/
SMRB
CXD
RAN 4
SMRA/
SMRB
CXD
RAN 5
SMRA/
SMRB
CXD
RAN 6
SMRA/
SMRB
CXD
RAN 7
SMRA/
SMRB
CXD
RAN 8
SMRA/
SMRB
SMR A
BTS
CXD
Hub
SMR B
BTS
20799-A
Figure 1-1. Digivance CXD Architectural Summary Diagram
2.2 General Description
The Hub is co-located with the BTS and interfaces directly with the BTS over coaxial cables.
In the forward path, the Full Band Hub Down Converter (FBHDC) receives RF signals from
the BTS and down converts the signals to IF. The Forward Simulcast Card (FSC) digitizes the
RF signals and passes digital IF (DIF) signals into the Sonet Interface (SIF) that converts them
to digital optical signals for transport to the RAN. At the RAN, another SIF card receives the
digital optical signal, passes DIF to the Remote Up Converter (RUC) and inputs signals into a
RF Assembly (RFA). The RF signals are duplexed and combined with other RF signals using a
combination of diplexers or triplexers and then fed into a multi-band antenna.