MFJ-1270C/1274C MANUAL ADVANCED OPERATION
Page 68
The MFJ TNC's protocol is designed for setting up "circuits" between two
stations. However it can also operate in a mode more suitable for a "net" or
"round-table" discussion with several participants, although reliable reception of
all transmissions by every station cannot be guaranteed. This is done by
enabling the monitor functions. Most of the monitor functions are described in
Chapter 4.
Monitoring is enabled by the command MONITOR ON, and separate monitor
functions are individually enabled.
If connected packet QSOs are taking place on the frequency of your group
conversation, you may wish to ignore all connected packets while your group
operates in unconnected mode. The command MALL OFF causes the MFJ
TNC to ignore connected packets.
If you want to be able to monitor packet activity when your station is not
connected, but have all monitoring automatically cease when you connect to
someone, set MCON OFF.
If you want to monitor stations selectively, you can set up a list of up to eight
callsigns with the command LCALLS. The callsigns in this list are regarded
as "buddies," i.e., the only stations you want to listen to if BUDLIST is ON.
Otherwise, the stations in the list will be ignored, and all other stations will be
monitored.
You can operate a group conversation with some data integrity by having the
stations connect in pairs and setting MALL ON and MCON ON. This does not
insure that every packet is received at every station, but it does insure that a
packet involved in a collision will be retried. If you have an odd number of
stations participating in this sort of conversation, one station can connect to
himself
via another station as digipeater.
or example, WB6YMH, WD0ETZ, WA0TTW, W1BEL, and K9NG wish to
carry on a group conversation. In order to make all the transmissions as reliable
as possible, the following connections are made.
WB6YMH connects to W1BEL
WA0TTW connects to K9NG
WD0ETZ connects to WD0ETZ via W1BEL
If each station specifies MCON ON and MALL ON, each station will see the
packets sent by all the others.
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