Specifications

Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual
6-22 Testing the Unit FCD-E1LC Ver. 1.0
This test checks the connections to the equipment connected to the remote sublink
port, all the circuits of the remote FCD-E1LC, the functions of the remote and local
FCD-E1LC, and the transmission plant interconnecting the two FCD-E1LC.
Transmission
Plant
User's
Equipment
Local FCD-E1LC
Data
Channel
Main
Link
Remote FCD-E1LC
Sub Link
"1"
Main
Link
Data
Channel
User's
Equipment
Sub
Link
User's
Equipment
User's
Equipment
Processor Processor
Figure 6-7. Sublink Remote Analog Loopback
Sublink Local Digital Loopback (LP LOC DIG SL)
The sublink local digital loopback is performed by connecting the sublink transmit
signal to the input of the sub receive path within the LIU section of the sublink
interface, as shown in
Figure 6-8.
The test signal is provided by the equipment connected to the local sublink,
which must receive its own transmission. This test fully checks the connections to
the equipment connected to the local sublink, including the operation of the
sublink interface.
User's
Equipment
Local FCD-E1LC
Processor
Main
Link
Data
Channel
Sub Link
User's
Equipment
Figure 6-8. Sublink Local Digital Loopback
Sublink Remote Digital Loopback (LP REM DIG SL)
The sublink remote digital loopback is performed by connecting the sublink
transmit signal to the input of the sub receive path within the framer section of
the sublink interface, as shown in
Figure 6-9. The test signal is provided by the
equipment connected to the remote sublink, which must receive its own
transmission.
This test checks the same functions as the sublink remote analog loopback, except
that it does not check the operation of the analog sublink interface.