Telenetics 326X V.34, V.32bis Series, V.34-SDC - page 226

6-Glossary
Glossary
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
compression (SDC)
An algorithm that allows the modem to run at a DTE rate higher than the DCE rate. This is
accomplished by receiving frames of data at the originating end, compressing, and then
transmitting the data at the slower DCE r ate, and decompressing the data at the receiv ing
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.
Tran smi ssio n ra te Bits per second passing over the telephone line or other communications circuitry.
Two- wir e A circuit consisting of one pair of wires.
V.22bis See ITU V.22bis.
V.2 4 See ITU V.24.
V.25bis See ITU V.25bis.
V.3 2 See ITU V.32.
V.32bis See ITU V.32bis.
V.3 4 See ITU-TS V.34.
V.4 2 See ITU V.42.
V.42bis See ITU V.42bis.