Northern UTA220/UTA220k manual Chapter Diagnostics, Communication Diagnostics, Global Tests

Diagnostics

Chapter 14

Diagnostics

COMMUNICATION DIAGNOSTICS

Communication diagnostic tests verify that the UTA220, the DTE, the NT1, the central office switch, and the remote unit are operating correctly. These tests can help determine the source of a fault down to a particular element responsible for it.

GLOBAL TESTS

Communication tests are initiated and terminated via the front panel under the GLOBAL TEST submenu of the DIAGNOSTIC OPTIONS menu. The following sections describe each of the diagnostic tests, when to use them, and what it means if they fail.

2B+D Loopback

This test sets the UTA220 up for a data integrity test that is run from the central office switch (Figure 14-1). This test causes the unit to loop data received from the ISDN on the D-channel and each B-channel back to the ISDN.

Figure 14-1. 2B+D Terminal Loopback Test

This is not a complete loopback; it is an echoing loopback where the D-channel loopback point is different from the B-channel loopback points.

UTA220/UTA220k 14-1