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Appendix D. Glossary

61200275L1-1 TSU IQ+ User Manual D-13

synchronizing bits (sync bits)

A fixed pattern in synchronous transmission used to identify the boundaries of

frames.

synchronous

Communications inwhich the timing isachieved by sharing asingle clock. Each

end of the transmission synchronizes itself with the use of clocks and informa-

tion sent along with the transmitted data.

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 T-1.

TELNET

The standard TCP/IP remote login protocol specified in RFC-854.

transmission

The dispatchingof asignal, message, or other form of intelligence bywire, 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.

T-span

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 non-intelligent terminal or terminal emulation mode used for asynchronous

communications. Used to configure the TSU IQ+.

yellow alarm

When the local CSU is in a red alarm condition, it sends a bit pattern (in-band in

SF, out-of-band in ESF) towards the network to tell the carrier and the far-end

CSU that there is a problem in the receive direction.

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