28 System Feature Overview
section for Private Calls, is provided in “System Design Considerations” on page 249 of this
document.
2.3.1.3 All Call
All Call is a one way voice call between a privileged operator and all users on a logical channel.
The transmitting radio utilizes a special All Call group that every radio on the same system and
logical channel (regardless of group) will receive.
In both Capacity Plus and Linked Capacity Plus systems, all the radios (including radios on busy
channels, except the transmitting radio(s) and radios listening to Emergency Calls) listen to an All
Call. The listening radios on a busy channel may take up to 350 ms to leave their channels and
enter the All Call late. The transmitting radio on a busy channel only enters the All Call late, after
finishing the ongoing transmission. If a radio initiates emergency while participating in an All Call,
then the emergency transmissions are made on the Rest Channel and the radios interested to
participate in the Emergency Call, leave the All Call to join the Emergency Call.
Example: An All Call is occurring on Channel 1, and Channel 2 is the Rest Channel. The radio
initiating an Emergency Call leaves Channel 1, moves to Channel 2, and starts the
Emergency Call. The start of the Emergency Call is announced on Channel 1. This
triggers the radios that want to participate in the Emergency Call to leave Channel 1 and
move to Channel 2.
As an All Call is considered a one-way transmission, users cannot talk back to an All Call. If the
user transmits after receiving an All Call, he transmits using his currently selected group. An All
Call follows the Admit Criteria of the selected channel. More information on the Admit Criteria is
provided in
“Channel Access Configuration” on page 382.
All Calls do not communicate across different time slots or channels within the system. The ability
to initiate an All Call is only programmed into radios that are used in supervisory roles. All other
radios monitor All Call transmissions by default. This feature is very useful when a supervisor
needs to communicate with all the users on a logical channel, rather than just a particular group or
individual.
In MOTOTRBO systems, capabilities for All Calls are configured with the portable and mobile
CPS. The repeater does not require any specific configurations for All Calls. Radios can be
configured to enable the user to select an All Call via the radio menu contacts list. All Calls can
also be mapped to a channel selection or a programmable button. A call receive tone, or call
preceding tone, can be configured to alert the target user of the incoming All Call. Greater detail on
the fleetmapping process governs who is allowed to make All Calls, as well as an introduction to
CPS configuration section for All Calls, is provided in
“System Design Considerations” on
page 249 of this document.
2.3.1.4 DTMF Hot Keypad
When this feature is enabled, the numeric keypad allows live dialing during dispatch operation.
During a voice call, the user can transmit the following characters using a MOTOTRBO radio with
keypad: 0 1 2 3 4 5 6 7 8 9 * #. These characters are encoded as dual tone multi frequency
(DTMF). These DTMF tones enable the user to communicate with a device connected to a control
station using the numeric keypad.
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