AT&T Definity 8510T Manual de usuario Pagina 71

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Data Options and Profiles
NOTE:
Mode 2 and Mode 3 are defined in the
AT&T Digital Multiplexed
Interface (DMI) Technical Specification
, 555-025-204. For a
copy of this manual, call the GBCS Publications Fulfillment Center
at 1 800 457-1235.
DX25 An abbreviation for D-channel X.25, configures the ADM for
establishment of outgoing data calls using X.25 packet switched data on
the D-channel. DX25 mode uses the PAD data options.
V.120 The remaining Mode values (whose names start with BV for
B-channel V.120 protocol) are appropriate selections for circuit switched
connections to equipment supporting this industry standard rate adaption
protocol. Two different
frame
modes are supported: Un-numbered
Information frame (UI-frame) mode, and Numbered Information frame (I-
frame) mode. UI-frame mode is more efficient than I-frame, but is not
error corrected, while I-frame mode is less efficient than UI-frame, but is
error corrected. I-frame mode is packet-oriented and uses the PAD data
options.
Two different channel bandwidths are supported: 64 kbps and 56 kbps.
Select BV64U for uncorrected (UI-frame) mode connections over
64 kbps facilities.
Select BV64I for error corrected (I-frame) mode connections over
64 kbps facilities.
Select BV56U for uncorrected (UI-frame) mode connections over
56 kbps facilities.
Select BV56I for error corrected (I-frame) mode connections over
56 kbps facilities.
4-13
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