Off-Hook - Circuit condition caused when the handset is lifted from the switch hook of the telephone set. Condition exists during call set-up or conversation.

Off-peak - The periods of time during which carriers offer discounted airtime charges. Usually, off-peak rates are available between 10:01 p.m. and 5:59 a.m. and on weekends and select holidays, but times can vary.

On-Hook - The normal circuit condition when the handset is on the switch hook of the telephone set.

Operator - In cellular, this is the local service provider operating company that owns the cellular system in that particular area.

OQPSK - Offset Quadrature Phase Shift Keying. QPSK with an initial phase offset (of usually 45 degrees); OQPSK has less envelope AM than QPSK.

Origination - A call that is placed by the mobile subscriber, calling either a land-line circuit or another mobile subscriber.

Oscillator - An electronic circuit which generates a signal at a specific frequency.

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