Northern UTA220/UTA220k - Manual (Page 109)

UTA220/UTA220k
12-33
D-Channel X.25
Since the PAD is not specified for 8 bit characters plus parity,
do not set the local DTE’s parity to 8 bits plus parity. When the
local DTE’s parity is set to 8 bits plus parity, the data output to
the DTE and the PAD service signals cannot be guaranteed to
be correct.
If the remote DTE is not stripping the parity before transmitting
the data to the local PAD, the local PAD may not recognize
the LF and CR characters (depending on the parity) for
line feed insertion and padding purposes.
*default
Parameter 22: Page Wait
Parameter 22 allows for the paging of data transmitted by the
PAD to the local DTE. This parameter specifies the number of
allowed line feeds to be transmitted by the PAD to the local
DTE before the PAD suspends data transmission to the local
DTE. When the specified line count of data has been
transmitted to the local DTE, the service signal PAGE is
delivered to the local DTE to notify the user that the data is
being displayed in page mode. Note that no service signal is
transmitted to the local DTE if parameter 6 (control of service
signals) is set to 0. No more data is delivered to the DTE until
the user sends the XON (Ctrl Q) character to cancel the page
wait condition. Upon cancellation of the page wait condition,
the PAD resumes the transmission of data to the local DTE
until the specified line feed count is reached again.
The page wait condition can be canceled by issuing the XON
character; however, there are certain situations that can occur
that would cause the PAD to automatically cancel the page wait
condition. These are:
• After the echoing of a line feed that was input by the user. If
the echo parameter (parameter 2) is not enabled, the page
wait will not be canceled.
• After the line deleted PAD service signal (and all its
associated line feeds) have been transmitted to the local DTE.
• Upon leaving the PAD command mode after all the associated
line feeds.
• Upon receipt of a data forwarding condition. For example, if
parameter 3 (selection of data forwarding character)
designates carriage return as the data forwarding character,
when a carriage return is received from the local DTE, the
page wait is canceled and the data currently stored by the
PAD is forwarded.
Table 12-27: Parity Treatment
Value Description
0 No parity checking or generation *
3 Parity checking and generation