Charles Industries 31929E - Manual (Page 11)

Section 319-29E-202
11
Step Action Action
8. Momentarily operate the 3192–9E front panel MLB
pushbutton switch. The 3192–9E front panel LB LED should light indi-
cating that the unit is in Loopback and the
TBERD-209 should be receiving the looped back
QRSS pattern.
9. Momentarily operate the 3192–9E front panel MLB
push-button switch. The 3192–9E front panel LB LED should extin-
guish and the TBERD-209 shows no signal.
10. Connect the TBERD-209 RCV to the Network In-
terface OUT or ‘Transmit’ (this point will vary by
installation. The intent is to access pins F and 6 of
the 3192–9E card-edge-connector). The TBERD-209 should see the QRSS pattern
attenuated by 7.5dB.
11. Condition the TBERD-209 to send the inband
loop-up code (11000 or 100000) for greater than 5
seconds, and then return to QRSS. The 3192–9E front panel LB LED should light and
the TBERD-209 should receive an AIS (all ones)
signal from the 3192–9E.
12. Condition the TBERD-209 to send the inband
loop-down code (11100 or 100) for more than 5
seconds, then return to QRSS. The 3192–9E front panel LB LED should extin-
guish & the TBERD-209 shows the QRSS signal
down 7.5dB.
13. Connect the TBERD-209 SEND to the Network
Interface IN or ‘Receive’ (this point will vary by
installation. The intent is to access pins K and 9 of
the 3192–9E card-edge-connector).
Reconnect the TBERD-209 RCV to the 3192–9E
front panel jack RCV RPT. Verify that the test set
is still sending QRSS.
The 3192–9E front panel CI LOS LED should be
extinguished and the TBERD-209 should be re-
ceiving the QRSS signal.
14. Disconnect all test set connections. Back out the
3192–9E, set S1 (PWR) to the PWR position. Set
S3–2 to the AIS position and reinsert the unit.
CAUTION: The customer interface will now have
up to 96V on the pairs.
Connect the TBERD-209 SEND to the 3192–9E
front panel XMT RPT jack. Connect the
TBERD–209 RCV to the 3192–9E front panel RCV
RPT jack.
The 3192–9E front panel CI LOS LED should flash
indicating that the unit has detected a customer
Loss-Of-Signal (LOS) and is sending AIS. The
TBERD-209 should be receiving AIS (all ones).
15. Condition the TBERD-209 to send the loop-down
code (11100 or 100). The 3192–9E front panel CI LOS LED should
change from flashing to steady and the
TBERD-209 should read NO signal.
16. Condition the TBERD-209 to send NO signal (all
zeros).
CAUTION: The customer interface will now have
up to 96V on the pairs
.
At the Customer Network Interface, connect the
receive pair to the transmit pair which will close the
simplex loop.
Using a Voltmeter, measure the voltage across the
front panel XMT + and – pin jacks. The voltage
should be approximately 0.6V indicating proper
operation of the ASPR circuit (delivering 60mA to
the load). Repeat this test across the RCV + and –
pins jacks and verify approximately 0.6V.
17. This completes the basic test of the 3192–9E. Dis-
connect all test equipment and test leads. Discon-
nect the loop setup which connected the receive
pair to the transmit pair. Set all switch options to
their design/application settings and perform any
additional end to end circuit checks per local pro-
cedure.