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NT7D16 Data Access card Page 421 of 894
Circuit Card Description and Installation
Note: If this feature is active, and the port is connected to a DTE that
holds DTR OFF when idle, the port will be permanently busied out to
inbound calls following the DTR timeout period.
Inactivity timeout
Once a successful data call is completed, the user's activity is monitored. If
no activity occurs within the amount of time configured in the downloaded
parameters, the DAC releases the call. Three minutes before the inactivity
timeout takes place, the DAC sends a warning message to the near-end
equipment if terminal mode is selected.
Wire test mode
The DAC allows for the EIA signaling leads to be tested to facilitate
installation and troubleshooting. This feature can be invoked through the
service change downloaded parameters, or by setting the appropriate front
panel switch. Wire test mode only operates when the port is idle. The leads
are cycled ON and OFF in 0.5 second periods (ON for 0.5 seconds, OFF for
0.5 seconds) for the number of cycles shown in Table 151 on page 421. The
lead status can be monitored by the front panel LEDs. The test will be run
indefinitely until the front panel switch is turned off, and the software wire
test parameters are disabled.
Note: For the most accurate results, be sure no equipment is connected
to the EIA leads.
Table 151
Wire test signal leads cycle counts
Label
EIA Signal Lead
description Pin
Cycle count
RS-232-C RS-422
TxD Transmit 2 1 1
RxD Receive 3 2 2
Note: The CTS signal is not included in the faceplate LED. Therefore, a
1.5-second delay will occur between the RxD lamp going on, and the DSR
lamp going on.