Controls and indicators 421
Controls and indicators
The LEDs on the DAC faceplateindicate the status mode for each port.
Figure 107 "NT7D16 Data Access card faceplate" (page 423) shows the
NT7D16 DAC faceplate.

Card status

The LED at the top of the faceplate is unlabeled. This LED is:
•off: if one or more ports are enabled
•on: if all ports are disabled

Electronic Industries Association signal monitors

The six LEDs located below the card status LED are labeled SD,RD,
DTR, DSR, DCD, and RI. They show the dynamic state of the associated
Electronic Industries Association (EIA) control leads for a specific port (as
shown by the display). When in RS-422 mode, only SD and RD are utilized.
When in RS-232-C mode, the LED goes on to indicate that the signal is
asserted on, or off to indicate that the signal is asserted off. When the LED
is off, there is no active voltage on the signal lead.

CONNECT

This lamp lights to indicate that a data call is established for the port
displayed. A data call is connected when the data module-to-data module
protocol messages are successfully exchanged between the two ends.

Port mode

This lamp lights to indicate that the port indicated is in RS-422 mode. If the
lamp is dark, the specified port is in RS-232-C mode.

Port number

The number displayed specifies the port driving the EIA signal LEDs
mentioned above. The push-button switch below the display allows you to
rotate among the six ports to monitor the activity of any port. This display
is also used to monitor several error conditions.

Port select button

This push-button switch below the display is used to select which port
is monitored.

Wire test

These switches are used to select the wire test mode for each of the six
ports.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.