User Manual Part 1

Installing the Host Unit

Page 70 FlexWave Prism Host, Remote and EMS 5.1 System Reference

3.3.5 Coaxial Cable Connections

The RF interface between the Host DART card and the EBTS/BTS is supported through

two type QMA female connectors mounted on each DART front panel. One connector

provides the coaxial cable connection for the forward path (downlink) signal and the

other connector provides the coaxial cable connection for the reverse path (uplink)

signal.

In most installations, it is usually necessary to insert an external attenuator into the

forward path link between the Host and the BTS. Before completing the forward path

connection at the BTS, verify that the composite forward path RF signal level at the

Host is between –25 and +5 dBm.

The Host should be mounted as close as possible to the EBTS/BTS to minimize cable

losses. Use the following procedure to route and connect the forward and reverse

path coaxial cables to the Host DART cards:

177 Obtain the required lengths of high performance, flexible, low loss 50-ohm coaxial

communications cable (RG-400 or equivalent) for all coaxial connections.

188 Route the forward and reverse path coaxial cables between the Host and the BTS

interface (per system design plan) and cut to the required length. Allow sufficient

slack for dressing and organizing cables at the Host and for installing an external

attenuator in the forward path link.

199 Terminate each cable with a QMA-Type male connector following the connector

supplier’s recommendations.

200 If required, install an external attenuator in the forward path.

211 Connect the forward and reverse path cables as shown in the following graphic.

aa Connect the forward path cable to the FWD RF IN connector on the Host DART

front panel.

bb Connect the reverse path cable to the REV RF OUT connector on the Host DART

front panel.

The composite forward path RF signal level at the Host must be between –25 and + 5

dBm. Do not connect

the forward path cable until the composite forward path RF signal

level is measured and the amount o

f external attenuation required is determined.