Rptu Loop-Back Test - Toshiba STRATA DK14 Installation And Maintenance Manual

ISDN Interfaces
ISDN Testing and Troubleshooting
The above response indicates the test was passed and that the B1, B2 and D channels and the wire
connections for the tested device are operating properly.
b. If The DK responds with:
TEST FAIL
The test failure could be caused by:
o U-terminal is in busy state when the test was started.
o U-terminal is in TQ/ACB/ACD mode when the test was started
o The DK BRI PCB slot or circuit number was not entered correctly.
o U-terminal can not support loop back testingU-terminal, BRI PCB, or wiring is defective.
c. If The DK responds with:
TEST EXIT
Test exit could be caused by:
o The DK processor did not get test results from the BRI circuit within 5 second from start of the
test.
o U-terminal or BRI circuit was unplugged during the test.
User made the exit request during testing
o

RPTU Loop-back Test

The RPTU has loop-back test jumpers that enable physical connections (cables/jacks/plugs)
between the RPTU, CSU, and the network PRI line to be tested (see
that the CSU receives and transmits the PRI signal properly in both directions. The test signals,
generated by the Network PRI provider, pass through the CSU and loop around the RPTU. The
RPTU sends the received test signal back through the CSU to the Network and the Network
detector checks for a valid signal.
Loop-back Test
1. Remove the PRI modular cord from the RPTU RJ45 jack and remove the RPTU from its card
slot.
2. Place the JP1 and JP2 jumpers to the LB-On position. Install the RPTU with the DK power Off
and the PRI modular disconnected from the RPTU RJ45 jack.
3. Turn the DK power On and connect the PRI modular cord to RPTU RJ45.
4. After the PRI line and RPTU are synchronized, have the CO generate the loop-back test sign
(all "1s" or "0s").
CAUTION!
5. If the loop-back test fails, perform tests to isolate the problem with an ISDN test set, such as
the Sunbird, ISDN, or Trend DUET. In this case, the network PRI line is disconnected and the
test set is connected to the CSU network input jack. For testing details, refer to the ISDN test
set operating procedures.
16-38
Do not have the CO do a QRS loop-back test, because the test signal may cause
the DK to drop all calls and/or stop operating.
Figure 16-30). The tests check
Strata DK I&M 6/00