User Manual

AS4000 DA CT Commissioning Unit
Operators Manual
GSI 002
605-0000-455
Issue 2.0 Date 21/03/00
Page 11 of 28 © Copyright Airspan 2000
DA COMMISSIONING UNIT
1. Introduction
The DA Commissioning Unit (DACU) is used during system commissioning
and routine maintenance. The Unit can be used to commission the AS4000DA
Central Terminal.
2. DACU Components
Component
DACU
RF Coupler
50 Ohm Termination
RF Connecting Lead
Power Connecting Lead
RS232 Modem Shelf Interface Cable
RJ11 to 9 way Connection Adapter
PC Interface Cable 9way-25way
PC Interface Cable 9way-9way
3. Architecture Overview
The Commissioning Unit architecture as depicted in Figure 1. Components
comprise:
i. Commissioning Unit
ii. Cables and couplers to allow the Commissioning Unit to be connected to
the RF sub-system.
iii. Cables to allow the Commissioning Unit to be connected to each Modem
Shelf (to support communications to each Shelf Controller).
iv. Associated system firmware upgrades required to support AGC operation
in cards such as the Shelf Controller.
4. Principles of Operation
The Commissioning Unit acquires a full low rate RF downlink / uplink through
RF cabling coupled into the CT transmit / receive antenna ports. Knowledge of
the path loss between the Commissioning Unit and RF antenna port allows the
Commissioning Engineer to adjust RF receive level as required using AS8100
Sitespan.
The Commissioning Unit scans and acquires a CDMA link to allow a specific
RF channel to be quickly adjusted during commissioning (or re-checked by a
visiting maintenance engineer)