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36 Conferencing API Programming Guide — August 2006
tone clamping: (DTMF tone clamping) Mutes DTMF tones heard in a conference. If a confereee’s phone
generates a tone, the DTMF signal will not interfere with the conference. Applies to transmitted audio into the
conference and does not affect DTMF function.
time division multiplexing (TDM): See TDM (Time Division Multiplexing).
time slot: The smallest, switchable data unit on a TDM bus. A time slot consists of 8 consecutive bits of data.
One time slot is equivalent to a data path with a bandwidth of 64 kbps. In a digital telephony environment, a
normally continuous and individual communication (for example, someone speaking on a telephone) is (1)
digitized, (2) broken up into pieces consisting of a fixed number of bits, (3) combined with pieces of other
individual communications in a regularly repeating, timed sequence (multiplexed), and (4) transmitted serially over
a single telephone line. The process happens at such a fast rate that, once the pieces are sorted out and put back
together again at the receiving end, the speech is normal and continuous. Each individual, pieced-together
communication is called a time slot.