Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 226)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
Parameters:
n 1 - 15, specifying frame acknowledgment time-out in 1 second intervals.
After transmitting a packet requiring acknowledgment, the MFJ-1278B will wait for the
specified frame acknowledgment timeout before incrementing the retry counter and sending
the frame again. If the packet address includes relay requests, the time between retries will
be adjusted to
Retry interval = n * (2*m + 1) where m is the number of intermediate relay stations.
When a retried packet is sent, a random wait time is added to any other wait times in use.
This is to avoid lockups in which two TNCs repeatedly send packets which collide with each
other. Frack will also reduce timeouts with multiple digipeaters.
FULLDUP ON/OFF
Mode: Packet Default: OFF
Parameters:
ON
Full duplex mode is enabled.
OFF
Full duplex mode is disabled.
When full duplex mode is disabled, the MFJ-1278B makes use of the Data Carrier Detect
signal from the modem to avoid collisions, and acknowledges multiple packets in a single
transmission with a single acknowledgment. When full duplex mode is enabled, the MFJ-
1278B ignores the DCD signal and acknowledges packets individually. The latter mode is
useful for full-duplex radio operation, such as through OSCAR 10. It should not be used
unless both your station and the station you are communicating with are full-duplex stations.
You may find full-duplex mode useful for some testing operations, such as the analog- or
digital-loopback tests.
FULLDUP should be ON during digital loopback tests.