Nortel Networks 553-3001-211 manual Programing DAC for mode 1 in service change LD11

NT7D16 Data Access card Page 435 of 894

Programing DAC for mode 1 in service change LD11

The DAC must be configured as R232 (the Autodial feature key is used for this mode). The DAC must not be configured as an Asynchronous Data Module (ADM) trunk.

Mode 2

This mode should be selected when the DAC is connected to a Hayes-1200 modem for inbound and outbound modem pooling. This mode is created specially to resolve some problems that were encountered with this modem, namely, the auto-reset implementation. When this modem is operating in the auto-reset mode, it drives both RI and DCD ON as long as DTR is OFF. This problem was resolved by driving DTR ON in the idle state, and OFF for 0.2 seconds, and then ON when an established call is dropped. The DAC also ignores the status of RI and DCD for approximately 2 seconds after a call is released to avoid false inbound call initiation.

Configuring Hayes 1200 for mode 2

To configure this modem, set the following parameters in LD11:

DEM DTE

PRM OFF

DTR ON

HOT OFF

To configure this modem, set the configuration switches as follows:

•switches 3, 8, and 10 to DOWN position

•all other switches to UP position. Switch 7 should be UP when using RJ-11 jack.

Programing DAC for mode 2 in service change LD11

When used for inbound or outbound Modem Pool only, the DAC can be configured as R232 in LD11. When used for both inbound and outbound Modem Pool, the DAC must be configured as R232. When the DAC is programmed as station hunting, outbound modem access should be in the opposite direction to the 500/2500 station hunting for the inbound modem access.

Circuit Card Description and Installation