Avaya 6211 Manual Do Utilizador

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This section describes the options you may need to modify for three common types of data
transfer.

For typical character by character data transmission, activate the factory profile (p0).  Depending
upon the network’s configuration, it may be necessary to change the Mode option to DX25 or
one of the V.120 modes.  (Check with your system administrator for your system’s
configuration.)

You may want to either create or change a line or block of characters at a time before sending
them to the far-end.  (Typically, this operation is only applicable to X.25 data connections; see
the explanation for Mode earlier in this chapter.)

First, activate the factory profile, p0.  Second, set the Mode option to DX25.  Third, set the Edit
option to on.  Fourth, change the Forwarding option from off to the desired value; typically this
should be cr.  Make sure that the ADM’s Echo option is set to on and the data terminal’s echo
option is set to off.

Binary files may contain the xon/xoff characters which are normally used for flow control.  Such
file transfers require that the flow control options, Rec.flow and Trans.flow, be set to  off or eia.
Many PC communications packages provide file transfer protocols which "mask" the xon/xoff
characters for binary file transfers causing the files to appear as a text file to the ADM.
Typically, such programs prompt you to specify if the file to be transferred is binary or text. You
need to be concerned with the following constraints of binary file transfers only if you do not
have such a program.

For a binary file transfer, both endpoints must be operating at the same speed and that speed must
not exceed the effective throughput of the data channel.  If it does, eia flow control will be
required.  Note, however, that not all computer interfaces support  eia flow control.

If your PC does not support eia flow control, you will have to set the flow control options off and
ensure that flow control is not required.  That is, both endpoints must operate at the same speed
and the speed can not exceed the effective throughput capability of the data channel.  (Even if
these requirements are met, continuous file transfer without pauses can still fail because the
speed of both endpoints are not exactly the same.  This may result in buffer overflow at the
receiving end.)

For D-Channel packet data transmission, the effective throughput capability varies depending on
network loading, but can not exceed 18 Kbps of asynchronous data.  Therefore, for DX25 mode,
you must not set the speed of the endpoints greater than 9.6 Kbps.  Under significant network
loading, the effective throughput capability may drop below this level and result in lost data.  For
Mode 2 protocol, the maximum effective throughput capability is 19.2 Kbps of asynchronous
data, therefore you must not set the endpoint speeds greater than 19.2 Kbps. For Mode 3 and the
V.120 modes, the effective channel throughput capability varies among endpoints but should be

Chapter 4