User's Manual

Vyyo Installation Guide

www.vyyo.com

WMTS US Port Mapping – p. 118

9.2.3 Checking the Upstream

Perform the following to isolate a problem on the upstream channel of the RF

frontend:

Measure the output power of the downconverter. Use a spectrum

analyzer tuned to the upstream channel IF (about 44 MHz), with a span of

20 MHz.

The following diagram illustrates a basic RF test setup.

Antenna

Coaxial Cable

Power Combiner

Downconverter

Tx Upconverter

and Power Amp

WMTS

Coaxial Cable

Antenna

Cable Modem

Coaxial Cable

Customer Equipment

100BaseT

Switched Hub

NMS Station and

IP Servers

100BaseT

Coaxial Cable

LNA

Filter

Cable Plant

Internet Router

Figure 9-1: Basic RF Setup