8 Issue 1, May 2004 61292023L5-5A
Total Reach DDS Central Office Unit Bidirec-
tional Loopback Support
The Total Reach DDS CO Unit will execute a bidirec-
tional loopback when responding to a DS0 or OCU
loopback, depending on the which CO unit is installed.
This allows a standard portable DDS test set, connected
to the 4-wire customer interface of the Total Reach
OCU-R, to verify the integrity of the two-wire loop by
transmitting a test pattern and examining the returning
data for synchronization and errors. The Total Reach
DDS CO unit NTWK LBK and CUST LBK LEDs will
illuminate during a DS0 DP bidirectional loopback. The
bidirectional loopback is illustrated in Figure 8.
Figure 8. DDS Trouble Codes
Remote End Initiated LBK Tests
The Total Reach DDS CO unit supports loopbacks
generated from the Total Reach OCU-R which allow
testing to be performed without coordination with the
CO or test center. Loopbacks initiated by the Total
Reach OCU-R front panel LBK pushbutton, aid in
system turn up testing or troubleshooting from the
remote end.
The Total Reach DDS CO unit will respond to a
loopback command initiated at the Total Reach OCU-R
as follows:
Pressing the Total Reach OCU-R LBK pushbutton once
will initiate a loopback at the Total Reach DDS -CO
unit toward the customer (Figure 9). This allows data to
be sent from the remote end to test the local loop and the
Total Reach OCU-R. This loopback is indicated by a
flashing CUST LBK LED on the Total Reach OCU-R
and a solid CUST LED on the Total Reach DDS-CO
unit.
Pressing the Total Reach OCU-R LBK pushbutton a
second time initiates a loopback at the Total Reach
OCU-R toward the 4-wire DDS (CPE) interface. A
solid CUST LBK LED on the Total Reach OCU-R
indicates a loopback at the Total Reach OCU-R toward
the customer equipment (Figure 10). Pressing the LBK
pushbutton a third time disables all current latching
loopbacks initiated by the Total Reach OCU-R LBK
pushbutton.
Figure 9. Total Reach OCU-R Remote End Initiated Loopback, Local Loop
Figure 10. Total Reach OCU-R Remote End Initiated Loopback, Customer Loop
DDS-DP
Bidirectional
Loopback
Customer
Intra-office
4-Wire
CPE Interface
TR
OCU-R
Push once for TR DDS-DP Loopback
Local Loop
ASC 9Eh
TR
DDS
CO
Loopback
Pushbutton
Test
Set
4-Wire
CPE Interface
TR
OCU-R
Push twice for TR OCU-R
Loopback
Local Loop
ASC 9Eh
TR
DDS
CO
Loopback
Pushbutton
Test
Set
ASC 9Eh
(14 pages)
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