40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
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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
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any other toll switching office in North America. Tandems are programmed to
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route themselves to other tandems if all other direct routes are busy. If all
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other tandems are busy in one area then your tandem will route itself to the
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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
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2600 Cycles per second facing all of thm numbers serviced by that exchange.
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This just means that the tandem is ready to be used. The other side of the
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the tandem is whistling 2600 cycles per second also into a number of trunk
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lines telling the phone system that the tandem has no outgoing or incoming
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calls.
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Dialing the Tandem:
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------------------
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You are automatically hooked into a tandem when you dial a long-distance
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phone number. The tandem then sends the number you dialed to the side facing
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away from you. The senling side stops whistling the 2600 cycles per second
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into the trunk line and at this point has been taken over. It will then carry
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the number dialed that will be converted to multi-frequency beep tones to a
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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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