User's Manual

2-10

2.4.2 Two Wire Line Interface Board P/N 943180-1

Provides remote control Base Station operation on 2 wire 600 ohm lines. Two wire Line

Interface board with EIA multi-tone, standard 2175Hz continuous tone, DC keying of

ground keying over audio lines. The multi-tone keying format consists of a high level 2175

tone followed by a 1950 Hz guard tone and then a low level 2175 Hz continuous tone is

utilized to key the transceiver. This board will also support 15mA current loop or ground

keying. Refer to Figure 2-4 for jumper locations to set functions and line level adjustments

for this board. Summary of jumper settings follow. Pins are numbers increase as you go

from top to bottom or left to right on the connector.

Set J1 for ST (standard 2175Hz continuous) Tone keying or for EIA (multi-tone keying

format).

Set J2 for Tone keying function ON (left jumper position) or OFF (right jumper position).

Set J3 for Time out timer OFF (left jumper position) or ON (right jumper position).

See Figure 2-4 for location of jumpers and left/right orientation.

TABLE 2-4 REMOTE CONTROL BOARD P/N 943180-1 SETTINGS

CONTROL FUNCTION

J1 Jumper Pin 1 and Pin 2 for ST (standard 2175 Hz continuous) tone Keying

Jumper Pin 2 and Pin 3 for EIA multi-tone Keying.

R24

R26

R41

R59

R64

Jumper Pin 1 and Pin 2 for Tone Keying.

Jumper Pin 4 and Pin 5 for Current Loop (15mA DC) or Ground Keying.

NOTE: Both options may be selected

Jumper Pin 2 and Pin 3 to disable Tone Keying.

Jumper Pin 5 and Pin 6 to disable Current Loop and Ground Keying.

Jumper Pin 1 and Pin 2 to enable Timeout Timer.

Jumper Pin 2 and Pin 3 to disable Timeout Timer.

Tx audio level Adjustment

Keying Tone Attenuator

1950 Tone level Adjustment

2175 Tone Level Adjustment

Sets Rx Audio Level Adjustment (Range -15 dBm to +10 dBm).

Sets Timeout Timer (Range 30 to 300 Seconds)