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116. Appendices
16.1.6 Simplex
Data can be transmitted in one direction only.
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—
PS
16.1.7 Half duplex
Data can be transmitted in both directions but only in one
direction at a time. This demands a certain discipline from the
data equipment on both sides.
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C —|
|
16.1.8 Full duplex
Data can be transmitted in both directions at the same time. To
obtain this, the modems either divide the available bandwidth of
the telephone channel, and use one half in each direction, or
they use echo cancellation, which gives virtually a complete
telephone channel in each direction.
ee
C=
C —|
16-4
LZTR104006 R1.00
Zat 14.4/14.4-7 and 19.2/19.2-7
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