Controls And Indicators - Nortel Circuit Card Installation Manual

Controls and indicators

Card status
Electronic Industries Association signal monitors
CONNECT
• 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
The LEDs on the DAC faceplate indicate the status mode for each port.
Figure 88 on page 431
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
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.
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.
NT7D16 Data Access card
shows the NT7D16 DAC faceplate.
Circuit Card
Page 429 of 906
Description and Installation