Nortel Circuit Card, Installation Manual, Page: 452 / 908

Page 452 of 906 NT7D16 Data Access card
553-3001-211 Standard 3.00 August 2005
Mode 5
This mode should be selected when the DAC is connected to an auto-answer
gateway for inbound Hotline operation. In this mode, the DAC automatically
executes Hotline operation when DCD is driven ON by the gateway. If the
DM being called by the Hotline operation is busy or not answering, the DAC
will place repeated Hotline calls as long as the DCD lead is ON until the
called unit answers. The gateway used in this mode should have the following
features:
Auto-answer capability This feature is required when the gateway is used
for inbound operation. It allows the gateway to drive the DCD lead ON when
the inbound data call is pending. In addition, the gateway should auto-answer
when the DTR lead is ON.
Dynamic control of DCD This feature must be supported by all gateways to
be connected to the DAC. It allows the gateway to drive the DCD lead ON
when the data call is established, and OFF when the data call is disconnected.
The baud rate of the Hotline call is determined by the AUTB and BAUD
parameters in LD 11. The system should be programmed to allow inbound
modem calls only.
Programing DAC for mode 5 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.
Mode 6
This mode should be selected when the DAC is connected to a gateway that
requires DTR to be ON always except during call disconnection. In this
mode, the DAC can be used for both inbound and outbound operations. The
operation of this mode is similar to mode 4 except for the following:
• The DTR lead is ON in the idle state.
• The DTR lead will be dropped OFF for 0.2 seconds when an established
call is disconnected.