Nortel Networks Circuit Card - Manual (Page 457)

NT7D16 Data Access card Page 457 of 906
Circuit Card Description and Installation
This mode should be selected when the DAC is connected to a host and
continuous Hotline operation is required. In this mode, the DAC repeatedly
tries to Hotline to the Autodial DN as long as DTR is ON. 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 will
automatically try 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 host and another data unit is required.
Programing DAC for mode 11 in service change LD 11
The DAC must be configured as R232 (the Autodial feature is used for this
mode). The DAC must not be configured as an ADM trunk.
Selecting the proper mode for Terminal connectivity
Select modes 12, 13, 14,and 15 when the DAC is connected to different types
of terminals. In these modes, the DAC operates as a DCE, drives DSR, DCD,
and RI control leads, and monitors DTR lead in modes 12, 13, and 15 (see
Figure 94 on
page 458 ). DTR is ignored in mode 14. All the menus and
prompts are sent to the terminals and all the commands from the terminals are
echoed. CTS, DSR, and DCD are driven OFF during the idle state (data call
is not established).
When the call is released, DSR and DCD are turned OFF for 200 ms. The RI
lead is controlled only in modes 12, 13, and 15, and is driven OFF in the idle
and connect states. An incoming call to the DAC causes the RI lead to go ON
for 2 seconds and then OFF for 4 seconds until the call is answered by the
terminal. When the terminal turns DTR ON, the DAC answers the call.
Mode 12
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 not-forced-DTR and not-Hotline. In this
mode, call origination and auto-answer will not be executed by the DAC,