A signaling mechanism--usually incorporated within a telephone set--that when rotated and released, generates dc pulses required for establishing a connection in a telephone system.

Hunting in which all the numbers in the hunt group are selected in a prescribed order.
Note: In modern electronic switching systems, the numbers in the hunt group are not necessarily selected in consecutive order.

In telephone systems, an electro-mechanical switching method whereby the selecting mechanism consists of a rotating element using several groups of wipers, brushes, and contacts.

[In magnetic media,] A technique used to locate a given sector, a desired track, and a specific record by continuous comparison of the read/write head position with appropriate synchronization signals.

1. The elapsed time for transit of a signal over a closed circuit.
Note: Round-trip delay time is significant in systems that require two-way interactive communication such as voice telephony or ACK/NAK data systems where the round-trip time directly affects the throughput rate. It may range from a very few microseconds for a short line-of-sight (LOS) radio system to many… (Read More →)

Deleting the least-significant digits of a number and applying some rule of correction to the part retained. [After SMPTE]

1. In communications systems operations, the geographical path that is followed by a call or message over the circuits that are used in establishing a chain of connections.
2. To determine the path that a message or call is to take in a communications network.
Note: In a Transmission Control Protocol/Internet Protocol (TCP/IP) internet, each IP datagram is routed separately.… (Read More →)

The allocation of circuits between two points over more than one geographic or physical route with no geographic points in common.

A pointer to a specific trunk group. [T1.667-1999]

A specific list of trunk groups. [After T1.667-1999]