User Manual

ADCP-75-192 • Issue D • October 2005 • Section 1: Overview
Page 1-2
 2005, ADC Telecommunications, Inc.
2.1 Basic Components
Figure 1-1 illustrates a Digivance CXD system with RAN’s distributed over a desired
geographical area, connected back to a group of Wireless Service Provider (WSP) base stations
at a Hub locale. The illustration shows utility pole mounted RAN’s, with pole top antennas.
The Digivance CXD Hub Equipment is comprised of Digital and RF cPCI chassis’ in a 19”
rack assembly. The Digivance CXD Hub equipment provides the interconnection at the RF
layer between the WSP base station sector(s) and the Digivance CXD Radio Access Nodes.
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 either,diplexers or triplexers and then fed into a multi-band antenna.