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- Tandem's
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- Written By Forest Ranger
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- The Tandem:
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- Each tandem is a line with the capability of signaling any other tandem in
- any other toll switching office in North America. Tandems are programmed to
- route themselves to other tandems if all other direct routes are busy. If all
- other tandems are busy in one area then your tandem will route itself to the
- next nearest tandem that may be in another part of the continent.
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- When a tandem is idle waiting for someone to use it sits there whistling
- 2600 Cycles per second facing all of thm numbers serviced by that exchange.
- This just means that the tandem is ready to be used. The other side of the
- the tandem is whistling 2600 cycles per second also into a number of trunk
- lines telling the phone system that the tandem has no outgoing or incoming
- calls.
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- Dialing the Tandem:
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- You are automatically hooked into a tandem when you dial a long-distance
- phone number. The tandem then sends the number you dialed to the side facing
- away from you. The senling side stops whistling the 2600 cycles per second
- into the trunk line and at this point has been taken over. It will then carry
- the number dialed that will be converted to multi-frequency beep tones to a
- tandem in the NPA and centeral office you requested.
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- FROM TARAN KING AT METAL SHOP (314)432-0756
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