Northern UTA220/UTA220k - Manual (Page 99)

UTA220/UTA220k
12-23
D-Channel X.25
*default
Parameter 7: Action of PAD on Break from DTE
Parameter 7 specifies the action taken by the PAD when the
PAD receives a break signal from the local DTE. The break
signal allows the DTE to signal the PAD without loss of
character transparency. The PAD also relays a break signal to
the DTE when the PAD receives a break from the remote DTE.
The PAD responds to the break only when a packet call is
established and the PAD is in the PAD data transfer mode.
Upon receipt of the break, all data stored by the PAD is
forwarded. The break signal consists of binary 0s for more than
135 ms.
Parameter 7 can be any added combination of the above values.
* default
Table 12-12: PAD Service Signal Control
Value Description
0 No PAD service signals or PAD prompt
1 PAD service signals in standard form but no PAD prompt
5 PAD service signals and PAD prompt in standard form *
Table 12-13: PAD Action on DTE Break
Value Description
0 The PAD does nothing on receipt of a break in PAD data transfer, PAD
command, or PAD connect-in-progress mode (while establishing a
call) *
1 An expedited interrupt packet is transmitted by the PAD prior to the
forwarding of the stored PAD data. If a previously transmitted interrupt
is not acknowledged, the break interrupt will wait until
acknowledgment of the previous interrupt is received.
2 A reset request packet is transmitted to the remote end after the
forwarding of the PAD data.
5 The PAD transmits an expedited interrupt packet, any stored PAD data
is forwarded, and an a X.29 indication of break packet is transmitted
8 Escape from PAD data transfer. Equivalent to a PAD recall
21 Transmitted data is discarded, and expedited interrupt packet is
transmitted if there is no outstanding interrupt, stored PAD data is
forwarded, and an X.29 indication of break packet is transmitted.
When data must be discarded, parameter 8 is set to 1. When the break
actions are completed, parameter resets to 0.