Dtmf/Ani Signaling; Project 25 Mode Features - E.F. Johnson Company 5100 SERIES Service Manual

2. Monitor the channel automatically or manually as
described in Section 2.6.3.
3. Press the PTT switch and the call proceeds as
follows:
•
If the Busy Channel Lockout feature is programmed
on the channel, the transmitter is automatically
disabled if the channel is busy (see Section 2.6.5).
•
Otherwise, busy and out-of-range conditions are not
indicated and speaking can begin after monitoring
the channel as described in Section 2.6.3.
4. Press (and hold) the PTT switch to talk and release
it to listen.
Receiving a Standard Conventional Call
1. Select or scan the channel programmed for the call
you want to receive (refer to Sections 2.5 and 2.6.12
for more scanning information).
2. When the call is received, press the PTT switch to
talk and release it to listen. If scanning, you may
have to respond before scanning resumes to ensure
that the response occurs on the channel of the call.

2.6.15 DTMF/ANI SIGNALING

DTMF (Dual Tone Multi-Frequency) tones can
be generated manually or automatically for ANI
(Automatic Number Identification) and other
purposes. The following options may be enabled by
system operator programming for each conventional
channel:
DTMF Keypad - Pressing 0-9, *, or # on the keypad
while holding the PTT switch transmits the corre-
sponding tone until the key is released.
Pre-Tx ANI - A preprogrammed ANI sequence is
automatically sent when you press the PTT switch.
Post-TX ANI - A preprogrammed ANI sequence is
automatically sent each time you release the PTT
switch.
Disabled - All DTMF signaling is disabled.

2.6.16 PROJECT 25 MODE FEATURES

Individual, Group, and NAC Codes
Individual ID - Each transceiver that operates on
Project 25 (digital) channels is programmed with
an 8-digit individual ID. This ID is unique for
each transceiver and can be any number from
1-16777216. When power is turned on with a
Project 25 channel selected, this ID is briefly
displayed.
Group ID - Each Project 25 channel is programmed
with a group ID that determines which group of
mobiles will receive the call. A call is received if
any Project 25 channel is programmed with that
group and the correct NAC is detected (see
following description). Group IDs can be any
number from 0-4095.
NAC - Project 25 conventional channels use a NAC
(Network Access Code) instead of Call Guard
squelch coding (see Section 2.6.6) to control
which calls are received on a channel. The NAC
can be 0-4095, and each transmit and receive
channel can be programmed for a different code.
Other operation, such as monitoring before trans-
mitting, is similar to that of standard analog
channels.
To receive a Project 25 group call, the talk group
programmed with the group ID being transmitted must
be selected or scanned. In addition, the receive NAC
programmed for that channel must be detected.
Viewing Individual ID
Each transceiver which operates on Project 25
(digital) channels is assigned an eight-digit individual
ID. When power is turned on with a Project 25 channel
selected, the individual ID of your radio is briefly
displayed.
Changing Talk Group Assigned To A Channel
If the Talk Group Select option switch is
programmed and user talk group programming is
permitted on the channel, the talk group assigned to a
channel can be changed. This change is permanent
2-15
OPERATION
September 2001
Part No. 001-5100-001