Specifications

Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics
FCD-E1LC Ver. 1.0 Testing the Unit 6-21
• As part of the tests that check the operation of the local FCD-E1LC. For this
purpose, activate one of the local main link loopbacks, or connect a physical
loopback that returns the main link transmit data through the receive path at
a desired location along the signal path.
• Check the quality of transmission over the whole link (end-to-end): in this
case, you may use the inband-activated loopback to create the loopback and
then activate the BER test. Alternately, you can activate the BER test at both
ends of the link, as explained above, or, if the remote equipment does not
support the BER test function, you can also use standard BER test equipment.
The type of test sequence and the timeslots in which the test is performed can
be selected by the user (see the
DEF BERT ML command in Appendix D ).
During the test, the local user’s equipment is disconnected.
Sublink Loopbacks
Sublink Local Analog Loopback (LP LOC ANA SL)
The sublink local analog 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 6-6.
The test signal is provided by the equipment connected to the local sublink, that
must receive its own transmission. This test fully checks the connections to the
equipment connected to the local sublink, and the analog (LIU) section of the
sublink interface.
User's
Equipment
Local FCD-E1LC
Processor
Main
Link
Data
Channel
Sub Link
User's
Equipment
Figure 6-6. Sublink Local Analog Loopback
Sublink Remote Analog Loopback (LP REM ANA SL)
The sublink remote analog 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 6-7. The test signal is provided by the
equipment connected to the remote sublink, which must receive its own
transmission.
During the loopback, the local FCD-E1LC sends an unframed “all-ones” signal to
the equipment connected to the local sublink port.