ADTRAN D4 U-BR1TE V - Manual (Page 12)

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
ASC 9Eh
Figure 10. IDSL/DDS Remote End Initiated Loopback, Local Loop
4-Wire
CPE Interface
OCU-R
Push once for
U-BR1TE Loopback
Local Loop
ASC 9Eh
U-BR1TE
Loopback
Pushbutton
Test
Set