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FAULT FINDING
SECTION 100-816-500
MARCH 1993
-14-
CHART NO.8
REMOTE MAINTENANCE FAULTS
START
Is Remote
Maintenance connection
via external modem on TTY
port or IMDU
modem?
IMDU modem installed on
PIOU or PIOUS (DK16 only)
8-1
END
Read the Remote Maintenance Section
100-816-600, Paragraphs 1 to 7. This chart
assumes that the remote terminal and
modem have no fault and that Remote
Maintenance does not operate.
Is the
fault
cleared?
Call your technical
support group.
If a Digital or Electronic telephone
is in the programming mode, it is
not possible to enter the Remote
Maintenance mode.
8-5
8-4
Is the
fault
cleared?
8-3
On DK8, check that Prog. 10-3, LED 04 is on
for QSMU TTY operation. Check that the
communication parameters of the remote
terminal are set to match the TTY port (7-data
bits, even-parity, 1-stop bit).
On DK16, check that PIOU/PIOUS SW3
switch
is in the TTY position.
Correct as necessary.
8-2
YES
NO
Check that the modem or terminal connected
to the TTY port is wired correctly per the
Remote Maintenance Section 200-816-600
and QSMU, PIOU/PIOUS MDF wiring in
Section 100-816-208.
Correct above if necessary or
replace QSMU, PIOU or PIOUS.
On DK16, the TTY port is the top
modular jack (SMDR is bottom) of
the PIOU/PIOUS.
On DK8 & DK16 the modular cord
connecting the TTY port to the
terminal or external modem must be
6-wires.
•
•
On DK16, check that the IMDU, PIOU, or
PIOUS is installed correctly per Section 100-
816-205.
On DK16, check that the baud rate switch
(SW2, push-button switch on PIOU/PIOUS)
is set to the correct position (300 bps LED
ON, 1200 bps LED OFF) to match the
remote terminal baud rate.
QSMU, TTY Port is 1200 bps only.
Correct as necessary.
External modem
connected to QSMU,
PIOU, PIOUS TTY port
Check that the communication parameters of
the remote terminal are set to match the
IMDU (7-data bits, even parity, 1-stop bit).
Check that the PIOU/PIOUS SW3
switch is in the MODEM position.
Enable the IMDU by turning LED 14 ON in
Program 77-1.
If required, assign CO lines for DISA or to
ring IMDU in system Program 78, Code
51~53.
When calling IMDU via DISA or ring
transfer, dial 619.
Correct above if necessary or
replace IMDU or PIOU(S).
•
•
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