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Appendix D. Glossary
synchronizing bits (sync bits)
A fixed pattern in synchronous transmission used to identify the boundaries of frames.
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 informa- tion sent along with the transmitted data.
T1
A digital transmission link with a capacity of 1.544 Mbps. T1 uses two pairs of normal twisted wires. T1 normally can handle 24 voice conversations with each conversation being digitized at 64 kbps. With more advanced digital voice encoding techniques, it can handle more voice channels. T1 is a standard for digital transmission in North America. It is also called
TELNET
The standard TCP/IP remote login protocol specified in
transmission
The dispatching of a signal, message, or other form of intelligence by wire, radio, telegraphy, telephony, facsimile, or other means. A series of characters, mes- sages, or blocks including control information and user data. The signalling of data over communications channels.
A telephone circuit or cable through which a T1 carrier line runs.
UAS
unavailable seconds. An unavailable second (UAS) state is declared at the onset of ten consecutive severely errored seconds (SES). The UAS state is cleared at the onset of ten consecutive seconds with no SES.
VT 100
A
yellow alarm
When the local CSU is in a red alarm condition, it sends a bit pattern
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