A communications common carrier--usually an interexchange carrier--that offers communications services in competition with AT&T and/or the established U. S. telephone local exchange carriers.

Organizationally Unique Identifier

A universal personal telecommunications (UPT) call type that permits a UPT user to make calls from any terminal on any network, and have access to his/her subscribed services limited only by the serving and/or assisting network's capabilities. [T
1. Rpt 41-1995]

A feature that enables the universal personal telecommunications (UPT) user to register for outgoing calls from the current terminal address to allow outgoing calls to be made from that terminal address. When registered, upon accessing the UPT facilities, all outgoing UPT calls can be made from that terminal address for the duration specified by the UPT user (duration may also… (Read More →)

An area not included in the subscribed service. An area may be defined in terms of a state/province, NPA, LATA, etc. [T1.207-1998]

Emission on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious emission. [NTIA] [RR]

In encryption, notification using a communication means other than the primary communication means. [After X9.49]

1. Signaling that uses a portion of the channel bandwidth provided by the transmission medium, e.g., the carrier channel, which portion is above the highest frequency used by, and is denied to, the speech or intelligence path by filters.
Note: Out-of-band signaling results in a lowered high-frequency cutoff of the effective available bandwidth.
2. Signaling via a different channel (either… (Read More →)

The time during which frame alignment is effectively lost.
Note: The out-of-frame-alignment time includes the time to detect loss of frame alignment and the alignment recovery time.

Signaling performed in digital time slots that are not within the channel time slot.