Nortel Networks 553-3001-211 manual Selecting the proper mode for Terminal connectivity

NT7D16 Data Access card Page 445 of 894

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 91 on page 446). 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,

Circuit Card Description and Installation