National PAD Parameters 72 - Break Signal Timing

National PAD Parameters 72 controls whether break timing information via National PAD Parameters 73 is sent with the indication of break PAD message.

In most PADs, when a break signal is received from the terminal, the PAD sends an X.25 interrupt packet, followed by an indication of break PAD message. The remote PAD usually ignores the interrupt packet, and transmits a break signal to the remote system when the indication of break PAD message is received.

The duration of the break signal is normally fixed. National PAD Parameters 73 specifies the duration of the break signal transmitted by the PAD. If National PAD Parameters 72 is set to value 0, the indication of break PAD message is sent normally, and is compatible with all networks.

If National PAD Parameters 72 is set to value 1, break timing information is sent along with the indication of break PAD message, by adding a parameter/value field to the indication of break PAD message. This sets the remote PAD National PAD Parameters 73 to a value that corresponds to the length of break as timed by the local PAD, so the break signal transmitted by the local PAD is very close to the length of the break signal received by the remote PAD.

Setting National PAD Parameters 72 to value 1 may confuse some networks, and should be used only where the remote PAD supports National PAD Parameters 73.

National PAD Parameter 72 supports the following values:

Values    Description                                               

0         No break timing information sent with signal (factory     

          setting)                                                   

1         Break timing information is sent with the break signal

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