User`s manual

Data Options and Profiles

An FCPN selection of on is used to request a window size of three and a

maximum packet size of 256 in the X.25 Flow Control Parameter negotiation

facility. Check with your system administrator to find out if on is a selection that

is available to you.

If this option is changed during an active data call, it does not take effect until the

next data call.

NOTE:

An FCPN setting of off is recommended when more than four ISDN

terminals connected to the same line are simultaneously using DX25

packet data communication. Otherwise, under the worst case load, packet

congestion on the line may result in lost data.

Forwarding

Option Values: off, cr (carriage return), ctrl (all control characters and

DEL), alpha (all alphanumerics), all (all characters)

Applicable Data Protocols: X.25, Mode 3, BV64I, and BV56I

The ADM sends data through the network in packets if the data protocol is X.25,

Mode 3, BV56I or BV64I. This option allows you to select a data-forwarding

character; a character used to signal that a data packet should be sent.

Set Forwarding to something other than off if you want a way to signal the ADM

to send a less-than-full data packet. For example, if you set Forwarding to

carriage return, the characters you type are stored until you press

RETURN

ENTER

on your data terminal keyboard. At that time, the characters are put into

a packet and sent out.

If you set Forwarding to ctrl, when you press any control character or

DEL

, a

packet is sent out.

Of course, if enough characters to fill a packet are typed before you enter the

Forwarding character, the full packet is sent. The Forwarding character is

included in the packet.

Typically, if you enable Forwarding, you will want some way to display characters

at your data terminal as you type them, and you will want a way to do local

editing. These could be features of your data terminal or you could use the Echo

and Edit options provided by the ADM.

Forwarding cannot be off if you wish to use Edit, Char.erase, or Line.erase.

Interactions with Rec.flow: If Forwarding is set to ctrl and xon/xoff flow control

is being used, then the xoff character

Ctrl

and the xon character

Ctrl

are used for flow control and will not cause packets to be sent.

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