Dte Loopback Test - General DataComm SpectraComm 800 T3 Installation & Operation Manual

Diagnostics

DTE Loopback Test

DTE Loopback commands the DSU to loop data back to the DTE at the channel interface. DTE
Loopback checks everything up to the channel interface.
The figure and table below describe the DTE Loopback data path and the TIA 613 specifications of
the DTE loopbacks that may be performed.
REMOTE PAYLOAD
LOOPBACK
DTE
Figure 4-10
Table 4-2 DTE-Initiated Loopbacks
TIA-613 Loopback
None
DTE Local Line (Loop B)
Remote Line (Loop C)
Local Digital Line (Loop A)
Note
The controller will display DTE alarms and an Unsolicited Test alarm when a DTE (HSSI) test is initiated.
4-8
DTE
LOOPBACK
DTE
LOCAL
LOOPBACK
DTE
MASTER SC800 T3 DSU
F
R
DTE
A
INTERFACE
M
E
R
DTE Loopback Tests
Loopback A
OFF
ON
OFF
ON
SpectraComm 800 T3 Data Service Unit
Installation and Operation Manual
Diagnostics Overview
SC800 T3 DSU
Tx DRIVER
F
R
DTE
A
INTERFACE
M
E
R
ANALOG
RECEIVER
SC800 T3 DSU
Tx DRIVER
F
R
DTE
A
INTERFACE
M
E
R
ANALOG
RECEIVER
REMOTE SC800 T3 DSU
ANALOG
Tx DRIVER
RECEIVER
ANALOG
Tx DRIVER
RECEIVER
Loopback B Same as:
OFF -
OFF Local Loopback
ON Remote Payload Loopback
ON DTE Loopback
F
R
DTE
A
INTERFACE
M
E
R
076R160-000
Issue 4