5 Tone (Select 5) Decoder
2-31
12.3
Group Calls
Group Calls allows a single user to call a number of other radio users at the same time for a one to
many conversation. Like a conference call, the entire conversation is shared with everybody in the
team. Although only one person can speak at a time, all members of the team can listen and take
part in the conversation.
Group Call can be achieved simply via PL radios. In this situation, all users will hear the call.
The key benefits of 5 tone radios is the ability to direct calls to a specific radio. It also allows systems
with a large number of radios to be configured to contain a number of small groups, perhaps based
on a functional or departmental basis. Each radio may be member of a number of groups.
For each decoder, it is possible to specify which digit positions in the received 5 tone sequence can
be “Group” digits. If a Group tone is received in that position rather than the usual number’s tone, the
radio recognises and decodes the call. The radio then generates a “Group Call” alert.
For example
Radio ID is:
1 2 3 4 5
Group digits:
- - - GG
Radio will respond to:
12345
(Individual Call)
123GG
(Group of up to 100 radios)
1234G
(Sub-Group of 10 radios)
Both normal and expanded group call decode is supported.
Benefits
One call puts you in contact with a team of people.
Allows radio to be part of one or more workgroups.
Much more flexibility to define groups than possible with PL/DPL.
Teamwork is possible even when team members may be geographically remote from each
other.
Information is shared quickly and efficiently.
12.4
ID Decode Display - Caller Identity (GM360, GM380)
When a user sends out a call, their user ID is usually encoded in the 5 tone sequence that is
transmitted. When that call is received, the receiving radio can extract the caller’s ID information
from the telegram. If the caller’s ID matches one in the contact list, the caller’s alias is displayed. If
there is no match in the contact list then just the ID digits are displayed.
Benefits
Enables user to know who is calling before they answer the call.
Answer important calls immediately.
Answer less important calls at your convenience.
If radio user is away from vehicle, they will know who called when they return.
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