AT&T 1987 AT&T ユーザーズマニュアル

All system CPs have the following features:

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Solid-state circuitry mounted on 7.6 by 14.1-inch printed wiring board (TN-type)

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Color coded face plate labels identify the CP type and function (White = Control,

Purple = Port or System Resource)

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Individual circuit functions all contained on one CP

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Metal tab for grounding

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Locking tab-type handle provides easy insertion or removal of a CP

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Port CPs can be inserted or removed with power “On” and the system processing

calls. Only the calls utilizing circuits on a removed CP will be affected.

Note:  Power must be turned off when replacing the following CPs:

—

Memory (ZTN81 or ZTN127)

—

Call Processor (ZTN82 or ZTN128)

—

Service Circuit (ZTN85)

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Status LEDs

— Port CPs:

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Red—“On” several seconds during power up and test, “Off” with test

pass. After test pass, “On” if fault in CP is subsequently detected.

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Green—“On” indicates resource available (port is translated)

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Yellow—“On” indicates a call in progress. “Off” when not in use.

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All LEDs “Off’’—CP is not translated.

— Common Control CPs:

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Memory CP: Red status LED only.

“On” several seconds during power up and test, “Off” with test pass.
After test pass, “On” if fault in CP is detected.

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Call Processor CP: Green Status LED only.

“Off” for several seconds during power up and test, then lamp flashes

to indicate an “OK” state. Steady “Off” or “On” indicates a problem.

— System Resource CPs:

● 

Service Circuit CP:

Similar to port CPs except yellow LED flashes to show system clock is
active and is steadily “On” when a tone receiver is in use. “Off”
indicates a problem.

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Modem Pool and Tone Detector CPs:

Same as Port CPs.

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