Avaya 6424D+M User Manual download pdf (Page 38)

approximately 10 milliseconds, then packets are transmitted to the network without artificial

delay. This is the case for a person typing.

If characters are received more closely spaced in time than as described above, characters are

assembled into packets. This may be the case of a computer answering a data base query or

transferring a file. In general, the size of the packet equals the number of characters received

prior to a gap in the reception or a full packet whichever is less. An exception to the above

occurs when the first packet after a gap is transmitted. This packet may contain fewer characters

(possibly only one character).

Interaction with Idle.timer: An Idle timer value greater than .05 seconds takes precedence over

the Min.timer.

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 bi-directional 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 bi-directional

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.

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Avaya 6424D+M User Manual Page 38

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