ADTRAN D4 U-BR1TE V

12 Section 61104020L4-5, Issue 3 61104020L4-5C

Performance Monitoring

Local Performance Monitoring is available only for

the U-interface, when configured for a leased mode of

operation. See the subsections entitled Loopback

Tests, Point-to-Point Test, and Local Loopback for

applicable test descriptions.

ADTRAN U-BR1TE Bidirectional Loopback

In LULT Mode, the ADTRAN U-BR1TE will execute

a bidirectional loopback when performing DS0 DP

loopback. See Figure 9 for an illustration of the

bidirectional loopback.

Remote End Initiated LBK Tests

The U-BR1TE supports loopbacks generated from the

remote unit which allows testing to be performed

without coordination with the CO or test center.

Loopbacks initiated by the OCU-R front panel LBK

pushbutton aid in system turn up testing or

troubleshooting from the remote end.

The U-BR1TE responds to a loopback command

initiated at the OCU-R as follows:

Pressing the OCU-R LBK pushbutton on the OCU-R

once will initiate a loopback at the U-BR1TE toward

the customer. See Figure 10. This allows data to be

sent from the remote end to test the local loop and the

OCU-R. This loopback is indicated by a flashing

CUST LBK LED on the IDSL OCU-R and a solid

LBK LED on the U-BR1TE.

Pressing the OCU-R LBK pushbutton a second time

will initiate a loopback at the OCU-R toward the

4-wire DDS (CPE) interface. A solid CUST LBK

LED on the IDSL OCU-R indicates a loopback at the

IDSL OCU-R toward the customer equipment.

See Figure 11. Pressing the OCU-R LBK pushbutton

a third time disables all current latching loopbacks

initiated by the OCU-R LBK pushbutton.

If errors exist the loopbacks can help determine the

source; either the local loop or the OCU-R.

Test Set

IDSL OCU-R

ADTRAN U-BR1TE

Bidirectional

loopback

Figure 9. ADTRAN U-BR1TE Bidirectional

Loopback

Figure 11. IDSL/DDS Remote End Initiated Loopback, Customer Loop

4-Wire

CPE Interface

OCU-R

Push twice for

OCU-R Loopback

Local Loop

ASC 9Eh

U-BR1TE Loopback

Pushbutton

Test

Set