Table of Contents
Advertisement
Flow Control Parameter Negotiation (FCPN)
Option Values: off, on
Applicable Data Protocols: X.25
A Flow Control Parameter Negotiation (FCPN) selection of off is used to enable the default
values of the window size and the maximum packet size (two and 128, respectively) by directing
the ADM not to request the X.25 FCPN facility.
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 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
the characters are put into a packet and sent out.
If you set Forwarding to ctrl, when you press any control character or
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
will not cause packets to be sent.
or
RETURN
ENTER
-
and the xon character
Ctrl
S
on your data terminal keyboard. At that time,
DEL
-
are used for flow control and
Ctrl
Q
Data Options and Profiles
, a packet is sent out.
4-7
Advertisement
Table of Contents
