Controls And Indicators (Nt4X25Ad /Av /Ch /Df) - Northern Telecom DMS-100 Series Installation And Maintenance Manual

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Controls and Indicators (NT4X25AD /AV /CH /DF)

0 The controls
0 to NT4X25AD /AV /CH /DF DUs.
0 Power LED:
0 The Power (Pwr) LED provides an indication of ac power
0 chronization
0 to the DU and there is no synchronization with the DLC or another
0 DU, the LED flashes.
0 is synchronization
0 lit. If there is no power to the DU, the LED is off.
0
Under Test LED:
0 When the DU undergoes any diagnostic or loopback test, the
0 Test LED remains lit for the duration of the test.
0
DTR LED:
0 The DTR LED (data terminal ready) lights when the DTE is ready to
0 transmit or
0 option is asserted.
0 3-33.
0 Connect LED:
0 The Connect
0 the connection
0 exchanged, the LED remains lit.
0 Busy key and LED:
0 This key (push button) places the DU in a busy state and informs
0 the DMS-100 Family switch that maintenance action is in progress.
0 The DMS-100 Family switch takes the DU out of service.
0 LED lights
0 is off, the DMS-100 Family switch is not informed of
0 action and the DU is placed in service.
0 This is an
0 switch.
0 Self Test:
0 This key (push button) selects either normal operation or a diag-
0 nostic self-test.
0 test is performed on the DU circuitry (the same as the power-up
0 self-test when the DU is inserted in the
0 indicated by
0 details on diagnostic self-tests see Self-test on page 5-9.
0 this key is not pressed, the DU is set for normal operation.
0
and indicator LEDs described in this section apply
with the DLC or another DU.
When power is supplied to the DU and
with the DLC or another DU, the LED remains
receive data.
See Paragraph: Assert DTR/Normal
LED flashes while a call is being connected.
is made and
when the DU is in the busy state.
optional control
When this key is pressed, a
the LEDs on
When power is supplied
This LED remains lit when the DTR
operating parameters
provided by
rack).
the faceplate of the DU.
297-2121-226
VINTAGE 05.01
and syn-
there
Under
on page
When
have been
The Busy
When the Busy LED
maintenance
the DMS-100 Family
diagnostic self-
Failures are
For more
When
3-29