Nortel Networks Circuit Card - Manual (Page 460)

Page 460 of 906 NT7D16 Data Access card
553-3001-211 Standard 3.00 August 2005
Mode 15
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.
Programing DAC for mode 15 in service change LD 11
The DAC must be configured as R232 since Autodial, Speed Call, and
Display commands are likely to be used.
Mode selection baud rates
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.