This text below was written in 2009,
well before the the c-Bridge existed. Much
more capability now exists on DCI, but this explanation
as well as the history of Amateur Radio's first use of All Call is
Motorola designed "All Call"
to be a supervisory talk group. "All Call"
is heard by ALL Talkgroups on the Time Slot. These unique
properties over-ride all efforts for selective listening
capabilities programmed into other user's modes
(channels). "All Call" over-rides the settings
of "Rx Groups" which is intended to provide selective monitoring of
multiples Talkgroups. An analogy would be making every
channel a "Priority" channel in a cheap police scanner, simulcasting 100% of the time on all Talkgroups or as if
one turned PL decode off in a receiver and then
listening to "carrier squelch" on a community repeater
with a tone panel. "All Call" is the only
Talkgroup that enables a user to over-ride all
user radios selective settings on a repeater or IPSC
network. It was designed to be much like field
supervisor's megaphone to all the troops, which is
certainly not to be routine or constant.
For these reasons, the "DCI"
and "Comm" talkgroups
were created as a replacement for "All Call".
So, "Comm 1" (TG ID #03777215) has replaced "All Call" on
Time Slot 1 and "Comm 2" has replaced "All
Call" on Time Slot 2. "All Call" is
not to be used on
any IPSC connected Timeslot. To be clear "DCI 1",
"DCI 2", "Comm 1" and "Comm
2" are four distinct
talkgroups and are only to be used on their matching
Timeslots. There are benefits to having these
talkgroup "pairs" and we have several "pairs" authorized
for network use on both Timeslots.
"DCI 1" and "Comm 1"
standard entry points into the DCI Networks.
If you'd like more information on
this issue, simply
Email your request.