Excalibur 366 Specifiche Pagina 199

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Troubleshooting
7-7
INTER-
FACE
TRANSMITTER
RECEIVER
LINES
DTE
INTERFACE
LOOP
LOCAL DAP
DAP
LOOP
DTE
Figure 7-7. Digital Loop Test
V.54 Digital Loop Test
The V.54 Digital Loop Test differs from the standard Digital Loop Test in that it creates
only one loop. It loops its receiver output to its transmitter input. It electronically
disconnects the DAP from the DTE. (See Figure 7-8.) You can run this test on the entire
aggregate bandwidth (Aggregate Digital Loop Test), through an individual port (Port
Digital Loop Test), or through a channel's lowest numbered port (Channel Digital Loop
Test).
When the service is set for DDS, this test may also be used to place a remote DAP into a
V.54 Digital Loop. To do so, initiate the test from the RCP. After the test is initiated,
press the Top button. Control is then returned to the local unit and the remote unit is
placed into a V.54 Digital Loop.
TRANSMITTER
RECEIVER
LINES
DTE
INTERFACE
LOOP
LOCAL DAP
DAP
LOOP
TX
RX
MARKING
GEN
DTE
Figure 7-8. V.54 Digital Loop Test
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