Remote End Initiated Lbk Tests; Figure 6. Tr Dds-R Remote End Initiated Loopback, Local Loop; Figure 7. Tr Dds-R Remote End Initiated Loopback, Customer Loop - ADTRAN TR OCU DP Installation And Maintenance Practice

Total Reach Office Channel Unit Data Port Installation and Maintenance Practice

Remote End Initiated LBK Tests

The TR OCU DP supports loopbacks generated from the TR DDS-R, which allow testing to be
performed without coordination with the central office (CO) or test center. Loopbacks initiated
by the TR DDS-R front panel
from the remote end. The TR OCU DP responds to a loopback command initiated at the TR
DDS-R as follows:
• Pressing the TR DDS-R
the customer. Refer to
local loop and the TR DDS-R. This loopback is indicated by a flashing
DDS-R and a solid
• Pressing the
LBK
the 4-wire DDS (CPE) interface. Refer to
indicates a loopback at the TR DDS-R toward the customer equipment.
• Pressing the TR DDS-R
loopbacks.
If errors exist, the loopbacks can help determine the source, either the local loop or the TR
DDS-R. During a remote end initiated loopback, the Total Reach system transmits ASC (9Eh)
toward the network, indicating an out-of-service condition generated by the remote end, as
shown in Figure 6 and
All Total Reach system latching loopbacks, whether initiated by a
from a remote Test Center, can be released by sending 35 DDS loop down TIP bytes
<X0111010> (where X is a "don't care" bit). All existing latching loopbacks can also be
disabled by pressing the
TR OCU
ASC 9Eh

Figure 6. TR DDS-R Remote End Initiated Loopback, Local Loop

ASC 9Eh

Figure 7. TR DDS-R Remote End Initiated Loopback, Customer Loop

12
pushbutton aid in system turnup testing or troubleshooting
LBK
pushbutton once initiates a loopback at the TR OCU DP toward
LBK
Figure 6. This allows data to be sent from the remote end to test the
LED on the TR OCU DP.
CUST
pushbutton a second time initiates a loopback at the TR DDS-R toward
pushbutton a third time disables all current latching
LBK
Figure 7.
pushbutton on the CO or remote unit.
LBK
DP
Local Loop
ASC 9Eh
TR OCU
DP
Local Loop
Push twice for TR DDS-R
Figure 7. A solid
CPE Interface
TR DDS-R
Loopback
Pushbutton
Push once for TR OCU DP
Loopback
CPE Interface
TR
DDS-R
Loopback
Pushbutton
Loopback
LED on the TR
CUST
LED on the TR DDS-R
CUST LBK
pushbutton, CO, or
LBK
4-Wire
Test
Set
4-Wire
Test
Set
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