Controls and indicators 421Controls and indicatorsThe LEDs on the DAC faceplate indicate the status mode for each port.Figure 107 "NT7D16 Data Access card faceplate" (page 423) shows theNT7D16 DAC faceplate.Card statusThe 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 disabledElectronic Industries Association signal monitorsThe six LEDs located below the card status LED are labeled SD, RD,DTR, DSR, DCD, and RI. They show the dynamic state of the associatedElectronic Industries Association (EIA) control leads for a specific port (asshown 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 isasserted on, or off to indicate that the signal is asserted off. When the LEDis off, there is no active voltage on the signal lead.CONNECTThis lamp lights to indicate that a data call is established for the portdisplayed. A data call is connected when the data module-to-data moduleprotocol messages are successfully exchanged between the two ends.Port modeThis lamp lights to indicate that the port indicated is in RS-422 mode. If thelamp is dark, the specified port is in RS-232-C mode.Port numberThe number displayed specifies the port driving the EIA signal LEDsmentioned above. The push-button switch below the display allows you torotate among the six ports to monitor the activity of any port. This displayis also used to monitor several error conditions.Port select buttonThis push-button switch below the display is used to select which portis monitored.Wire testThese switches are used to select the wire test mode for each of the sixports.Nortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
