Okay, kids, get to your seats and open your books to page 7. This class is entitled "Telecomm 101".
Three pair per line
Pair 1 --- Tip and Ring --- Talk Path.
Pair 2 --- A and A1 --- Battery and ground to operate relays (Hold, etc.)
Pair 3 --- Lamp and Lamp Ground ---- Lights!
Just Bill can tell you about the Central Office Toll / inter-office circuits ---- relays IDed by letters. The "A" refers to the action it controls by the "A" relay. "E&M" circuits (EAR & MOUTH) sent and received battery and ground to control the particular operation. Just like ground start trunking.
Next week we will cover "Wink" and how it starts (play on words, wouldn't you say?) :read:
Have a nice recess, class dismissed.
KLD
