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Mode
Option Values: B2, BA, DX25, BV64U, BV64I, BV56U, BV56I
If this option is changed during an active data call, it will not take effect until the next data call.
Mode selects the preferred data protocol your ADM uses to originate a data call. This option
refers to data call origination only. (Incoming calls, in contrast, are always answered with the
data protocol specified by the compatible caller.)
The Mode option setting must be matched to the capabilities administered on your ISDN
telephone line and to that of the endpoint you are calling. To find out which values of the Mode
option you should select, contact your system administrator. Data calls will not work unless your
telephone line has been administered for the data mode(s) you wish to use (that is, ISDN
D-Channel packet switched data service for Mode DX25 and ISDN B-Channel circuit switched
data service for the other Modes).
B2
An abbreviation for B-Channel Mode 2, configures the ADM for establishment
of outgoing data calls using AT&T's Mode 2 circuit switched data transmission
protocol. B2 and BA are appropriate selections for circuit switched connections
over 64 kbps facilities to endpoints supporting one or both of these protocols.
Mode 2 protocol is not error corrected and does not provide bidirectional flow
control when endpoint speeds are mismatched. Mode 2 does provide less delay
than Mode 3 on transmitted and received data. Select B2 to establish a data call
using Mode 2 protocol. If the user escapes to Local Mode while the far end is
transmitting Mode 2 data, this data may be lost.
BA
An abbreviation for B-Channel Adaptive, configures the ADM for establishment
of outgoing data calls using AT&T's Mode 3/2 adaptive circuit switched data
transmission protocol. B2 and BA are appropriate selections for circuit switched
connections over 64 kbps facilities to endpoints supporting one or both of these
protocols. Mode 3 protocol is error corrected and does provide bidirectional
flow control when endpoint speeds are mismatched. Mode 3 can cause slightly
higher delays than Mode 2 on transmitted and received data. Mode 3 is a
packet-oriented protocol and uses the Packet Assembler Disassembler (PAD)
data options. Select BA to attempt to establish a data call using AT&T Mode 3
protocol. If the endpoint you are calling cannot accept this type of call, the
ADM then reattempts using AT&T Mode 2 protocol.
Note:
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.
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 Customer Information Center at 1 800 432-6600.
Data Options and Profiles
4-11
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