AT&T AT&T manual Circuit Pack Features

Circuit Pack Features

All system CPs have the following features:

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

●Color coded face plate labels identify the CP type and function (White = Control, Purple = Port or System Resource)

● Individual circuit functions all contained on one CP

●Metal tab for grounding

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

●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)

●Status LEDs

—Port CPs:

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

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

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

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

●All LEDs “Off’’—CP is not translated.

—Common Control CPs:

●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.

●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.

●Modem Pool and Tone Detector CPs: Same as Port CPs.

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