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SYN
Sync character. Establishes synchronism and fills time in the absence of any data or control
character to maintain synchronism.
Synchronous
Data accepted or provided with an accompanying time signal.
Synchronous Data
An algorithm that allows the modem to run at a DTE rate higher than the DCE rate. This is
compression (SDC)
accomplished by receiving frames of data at the originating end, compressing, and then
transmitting the data at the slower DCE rate, and decompressing the data at the receiving
side. The compression algorithm is derived from the V.42bis data compression algorithm.
SDC only applies when synchronous data is framed in HDLC-SDLC-like format.
Tail circuit
A point-to-point, second-tier circuit directly connected (back to back) to the remote modem
of the first-tier circuit. The connection is made using a DCE/DTE crossover cable.
Training
A technique that adjusts modems to current telephone line conditions. The transmitting
modem sends a special training sequence to the receiving modem, which makes necessary
adjustments for line conditions.
Transmission rate
Bits per second passing over the telephone line or other communications circuitry.
Two-wire
A circuit consisting of one pair of wires.
V.22bis
See ITU V.22bis.
V.24
See ITU V.24.
V.25bis
See ITU V.25bis.
V.32
See ITU V.32.
V.32bis
See ITU V.32bis.
V.34
See ITU-TS V.34.
V.42
See ITU V.42.
V.42bis
See ITU V.42bis.
6-Glossary
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Troubleshooting
