ADTRAN 1200130L2, 1200130L1 user manual Synchronous

Glossary

synchronous

Communications in which the timing is achieved by sharing a single clock. Each end of the transmission synchronizes itself with the use of clocks and information sent along with the transmitted data.

synchronous data link control (SDLC)

A link-level communications protocol used in an international business machines (IBM) systems Network Architecture (SNA) network that manages synchronous, code-transparent, serial information transfer over a link connection. SDLC is a subset of the HDLC protocol developed by ISO.

T1

Transmission rate of 1.544 Mbps on T1 communication lines. A T1 facility carriers a 1.544 Mbps digital signal. Also referred to as digital signal level 1 (DS- 1). See also E1 and channel.

trunk line

A communications line connecting two frame relay switches to each other.

VT 100

A non-intelligent terminal or terminal emulation mode used for asynchronous communications. Used to configure the FSU.

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