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Section 61102040L4-5, Issue 2 61102040L4-5B
12
Remote End Initiated LBK Tests
The U-BR1TE supports loopbacks generated from
the IDSL OCU-R which allow 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 once will
initiate a loopback at the U-BR1TE towards the
customer. See Figure 9. This allows data to be sent
from the remote end to test the local loop and the
IDSL 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
initiates a loopback at the OCU-R towards the 4-wire
DDS (CPE) interface. A solid CUST LBK LED on
the IDSL OCU-R indicates a loopback at the IDSL
OCU-R towards the customer equipment.
See Figure 10. Pressing the OCU-R LBK pushbutton
a third time disables all current latching loopbacks
initiated by the LBK pushbutton.
If errors exist the loopbacks can help determine the
source; either the local loop or the IDSL OCU-R.
During a remote end initiated loopback the IDSL/DDS
system transmits ASC 9Eh towards the network,
indicating an out-of-service condition generated by the
remote end, as shown in Figures 9 and 10.
All IDSL/DDS system latching loopbacks, whether
initiated by the IDSL OCU-R craft interface, LBK
pushbutton, CO, or from a remote Test Center, may be
released by sending 35 DDS loop down TIP bytes
<X0111010> (Where X is a “don’t care” bit.) All
existing latching loopbacks may also be disabled by
pressing the LBK pushbutton on the CO or remote
unit.
NOTE
The remote end test feature is only supported
when the upstream U-BR1TE is an ADTRAN
D4 or Series 5 U-BR1TE with DDS Loopback
capability. Other U-BR1TEs will ignore the
loopback command sent by pressing the IDSL
OCU-R LBK button.
Figure 10. IDSL/DDS Remote End Initiated Loopback, Customer Loop
4-Wire
CPE Interface
IDSL
OCU-R
Push twice for IDSL OCU-R
Loopback
Local Loop
ASC 9Eh
SLC-5
U-BR1TE
Loopback
Pushbutton
Test
Set
ASC 9Eh
Figure 9. IDSL/DDS Remote End Initiated Loopback, Local Loop
4-Wire
CPE Interface
IDSL
OCU-R
Push once for SLC-5
U-BR1TE Loopback
Local Loop
ASC 9Eh
SLC-5
U-BR1TE
Loopback
Pushbutton
Test
Set