User's Guide

User guide NTXXXXXX Rel 3.0 Draft October 2000
4-1
Trouble clearing procedures 4-
This chapter contains information for fault locating, testing, and clearing
alarms for the Internet BWA System 3200.
Testing the Radio faults
The Internet BWA System 3200 has three types of loopback tests for fault
isolation.
RF Loopback test
This loopback retunes the receiver to the transmit frequency. RF leakage
through the diplexer assembly prompts the local receiver to synchronize with
the local transmitter. This loopback test provides an unambiguous check of all
active circuitry in the Internet BWA System 3200.
Unwanted emissions are squelched by the transmit diplexer (out-of-band of the
RF bandpass filter). This loopback test is used for troubleshooting purposes.
To use this function, refer to Chapter 5, “User interface description”.
Loopback test for the local tributary
Loops the tributary input (data from customer) back onto tributary output (data
to customer) at local terminal. This test checks connection to the customer
equipment. To use this function, refer to Chapter 5, “User interface
description”.
Loopback test for the remote tributary
Loops the remote tributary output (data to customer) back into remote tributary
input. This test checks the radio link operation. This loopback test does not
include the remote tributary line driver or the remote tributary line receiver. To
use this function, refer to Chapter 5, “User interface description”.