Fault Isolation Flowcharts
Fault Finding
Strata DK40 I&M Spring 1999
9-15
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Flowchart 9-8 Remote Maintenance Faults
START
Is Remote
Maintenance connection
via external modem on TTY
port or IMDU
modem?
IMDU modem installed on
PIOU or PIOUS
8-1
END
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
Check that the
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
PIOU/PIOUS MDF wiring in Chapter 4.
Correct above if necessary or replace
PIOU or PIOUS.
The TTY port is the top modular
jack (SMDR is bottom) of the
PIOU/PIOUS.
The modular cord connecting the
TTY port to the terminal or external
modem must be 6-wires.
•
•
Check that the baud rate switch (SW2, push-button switch on PIOU/PIOUS) is set to match the remote
terminal baud rate (300 bps LED ON, 1200 bps LED OFF) .
Check that the IMDU, PIOU or PIOUS is installed correctly.
Check that communication parameters of remote terminal are set to match the PIOU or PIOUS TTY
port or IMDU (7-data bits, even parity, 1-stop bit).
Correct as necessary.
External modem connected
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 Exchange lines for
DISA or to ring IMDU in system Program
78, Code 51~ 53.
When calling IMDU via DISA or ring
transfer, dial #19.
If calling IMDU via DDI lines, call the CPN
number assigned in Program *11.
Correct above if necessary or
replace IMDU or PIOU(S).
•
•
•
1886
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