Nortel Networks Circuit Card - Manual (Page 459)

NT7D16 Data Access card Page 459 of 906
Circuit Card Description and Installation
Mode 13
This mode should be selected when the DAC is connected to a terminal
(DTE) and Hotline call origination is required. This mode is similar to the
operation of the ASIM when set to not-forced-DTR and Hotline. In this mode,
the terminal is able to Hotline to a specific data unit by driving the DTR lead
ON. The transition of DTR from OFF to ON causes the DAC to Hotline to the
Autodial DN. Any terminal that drives DTR lead ON can be used with this
mode (such as VT100 or VT102).
The DAC drives CTS, DSR, and DCD ON, except when a call is dropped. In
this case, the DAC drives those leads OFF for 0.2 second and then ON. The
baud rate of the Hotline call is determined by the AUTB and BAUD
parameters in LD 11.
Programing DAC for mode 13 in service change LD11
The DAC must be configured as R232 or R422 since Autodial, Speed Call,
and Display commands are likely to be used.
Mode 14
This mode should be selected when the DAC is connected to a terminal
(DTE) for inbound and outbound data calls. This mode is similar to the
operation of the ASIM when set to forced-DTR and not-Hotline. The terminal
used with this mode is not required to drive the DTR lead. This mode of
operation is similar to mode 12, except for the following:
• The status of DTR lead is assumed to be always ON, even when the
actual condition of that lead is OFF (forced-DTR). The DAC always
answers an incoming call regardless of the DTR status.
• The terminal cannot release an established data call by driving DTR
OFF. As a result, the terminal cannot initiate call release except with a
long break or three short breaks.
Programing DAC for mode 14 in service change LD 11
The DAC must be configured as R232 since Autodial, Speed Call, and
Display commands are likely to be used.