MFJ MFJ-1270C, Системное руководство

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MFJ-1270C/1274C MANUAL COMMANDS
Page 115
Prioritized acknowledgments and slotted channel access can be enabled or
disabled independently of one another. So you could if you wished run normal
AX.25 with slotted channel access or the new protocol without slotted channel
access.
ACKT IME nnnn Mode: Packet Default: 14 (140 ms)
Parameters:
nnnn
0 - 250, in 10 ms intervals.
The
ACKTIME parameter controls a delay that occurs whenever any packets
have been received by the MFJ TNC that are not addressed to the MFJ TNC.
ACKTIME should be calculated by the radio channel baud rate, and by the
keyup and keydown (TXDELAY and fixed timer, in TNC) delays. It should
reflect the time it takes for an acknowledging TNC on the channel to keyup, send
it's acknowledgement, and release the PTT. This represents the time required to
send a response frame (with no I field appended) at the baud rate being used on
the radio port.
The current 100 millisecond default is close but should be adjusted for 1200
baud work to 130 milliseconds (ACKTime set to 13).
For 300 baud HF work this parameter should be set to 520 milliseconds
(ACKTime set to 52).
AN SWRQRA ON|OFF Mode: Packet Default: ON
Parameter:
ON MFJ TNC responds to non-digipeated UI frames
addressed to QRA, within 1 to 16 seconds, with an
empty ID packet.
OFF Disables MFJ TNC 's ping-response function.
QRA ("Who are you") pinging is supported by the MFJ TNC. A QRA ping polls
all of the TNCs within range. A random number of seconds later, each TNC that