self-synchronizing code

A code in which the symbol stream formed by a portion of one code word, or by the overlapped portion of any two adjacent code words, is not a valid code word. Note 1: A self-synchronizing code permits the proper framing of transmitted code words provided that no uncorrected errors occur in the symbol stream. Note 2: External synchronization is not required. Note 3: High-level data link control (HDLC) and Advanced Data Communication Control Procedures (ADCCP) frames represent self-synchronizing code words.

self-testing circuit

A circuit that uses the data it is retransmitting to perform tests on itself to ensure that it is transmitting properly, i.e., to ensure that all circuit components are functioning properly. [After Weik ’96]

semi-permanent connection

A connection established via a service order or via network management. [T1.627-1993]

semiautomated tactical command and control system

A machine-aided command and control system in which human intervention is required in varying degrees to operate the system.

semiautomatic switching system

In telephone systems, a switching system in which telephone operators receive call instructions orally from users and complete them by automatic equipment. 2. At tape-relay intermediate stations, the manual routing or rerouting of taped messages without rekeying them.

semiconductor laser

Synonym injection laser diode.

semiduplex operation

A method which is simplex operation at one end of the circuit and duplex operation at the other. RR Footnote: In general, duplex operation and semiduplex operation require two frequencies in radiocommunication; simplex operation may use either one or two. [NTIA] [RR] 2. Operation of a communications network in which a base station operates in a duplex mode with a group of remote stations operating in a half-duplex mode. Note:The terms “half-duplex” and “simplex” are used differently in wire and radio communications.

send loudness rating (SLR)

See sending loudness rating. [T1.508-1998]

sender

A device that accepts address information from a register or routing information from a translator, and then transmits the proper routing information to a trunk or to local equipment. Note: Sender and register functions are often combined in a single unit.

sending loudness rating (SLR)

The ratio in dB of the sound pressure produced by a speaker to the voltage produced by a telephone and loop as defined by ITU-T Recommendation P.79. [T1.255-1997]

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