Nortel Networks Circuit Card User Manual

 NT7D16 Data Access card

This mode provides a “virtual leased line” and the meaning of the “Forced 
DTR” switch is re-defined.

This mode should be selected when the DAC is connected to a terminal 
(DTE) and continuous Hotline call origination is required. In this mode, the 
DAC repeatedly tries to Hotline to the Autodial DN as long as DTR is ON. 
This operation is similar to having a leased line feature, where the connection 
between two extensions is always established. When the DAC tries to Hotline 
to a busy Data Module, it activates Ring Again and the connection is 
established as soon as the called unit is free. After establishing the data call, 
if the called unit releases the call for any reason, the DAC automatically tries 
to Hotline again to reestablish the call.

If the data unit being called does not answer the Hotline call, the DAC tries 
to place another Hotline call once every 40 seconds until the called unit 
answers. This mode is recommended only when a permanent connection 
between a terminal and another data unit is required. The baud rate of the 
Hotline call is determined by the AUTB and BAUD parameters in LD 11. 
The status of CTS, DSR, and DCD is controlled in a similar manner as 
described in mode 13.

The DAC must be configured as R232 since Autodial, Speed Call, and 
Display commands are likely to be used.

The AUTB and BAUD parameters in LD 11 provide two functions for calls 
originated from a DAC:

•

Provide a way to select a baud rate of a Hotline call. The DAC starts the 
Hotline operation without receiving a <CR> for autobaud.

•

Set the DAC to operate at a fixed baud rate. The DAC does not return the 
menu or Hotline unless a <CR> is received at the selected baud rate. 
Normally the DAC should be selected to operate at autobaud.