NT7D16 Data Access card Page 417 of 894
Circuit Card Description and Installation
• Wire test mode
• Self diagnostics
• Inbound modem pooling with any asynchronous modems
• Outbound modem pooling using “dumb” modems
• Outbound modem pooling using auto dialing modems

Controls and indicators

The LEDs on the DAC faceplate indicate the status mode for each port.
Figure 85 on page 419 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.