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- If the LINE 2/DATA indicator lights, the communication device is in
use. Use LINE 1 to make a call. Otherwise the communication
device may not operate properly.
4. FOR SCHEMATIC DIAGRAM
1. SW 1: Hook switch.
2. SW 2: Ringer selector.
3. DC voltage measurements are taken with electronic voltmeter
from negative voltage line.
4. (Add 40 mA to telephone line from the loop simulator.)
5. Off-hook condition
6. No Mack: Handset Mode
7. This schematic diagram may be modified at any time with the
development of new technology.
8. The shades area on this schematic diagram incorporates special
7
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