3.8 V.54 Channel Loopback Test
1. From the module main menu, select TEST CONFIGURATION
and configure as follows:
MODE: STUC E1, STUR E1, or E1
Tx SOURCE: TESTPAT
TEST RATE: Nx64/2.048M (as required)
When finished, press ENTER.
STU
Modem
TX
MUX
RX
E1
Figure 51 V.54 Channel Loopback Test
2. Connect the test set into the circuit as shown in Figure 51
and press HISTORY to acknowledge any blinking LEDs.
3. From the module main menu, select MODEM CONTROL >
LOOPBACK CONTROL and press the F-key that will loop up
the far end device. The STATUS line will indicate either suc-
cess or error.
4. From the module main menu, select E1 MEASUREMENT and
run a BERT by pressing ERR INJ
5. Stop the test.
6. From the module main menu, select MODEM CONTROL >
LOOPBACK CONTROL and press LOOP-DN (F1) to loop
down the far end device. The STATUS line will indicate either
success or error.
MTT-14B e_Manual D07-00-083P RevA00
Page 75 of 101
