Walkie-Talkie (Multicast) Communication; Rf Network Optimization For Walkie-Talkie Communication - Motorola CA50 Developer & User Manual

Walkie-Talkie (Multicast) Communication

Walkie-talkie communication is initiated and controlled by the UCA client application running on the CA50. This
feature operates in speaker phone mode as well as with an earbud. walkie-talkie communication is initiated by
pressing a key on the CA50 at which time the device sounds a tone to prompt the user that voice communication
can begin. The user is also prompted with an alert tone indicating an incoming communication. Speaker and
earbud volume is controlled by the keys on the client device and can be adjusted at any time, except while on a
voice (unicast) call (see
Walkie-talkie functionality supports up to 32 separate channels that are prioritized by channel number (where 1 is
the highest priority and 32 is the lowest). The UCA server and UCA client application can associate channels with
functional names, such as emergency, department, etc., but the implementation below the UCA client application
only supports channel numbers when processing calls.
Once the CA50 device has successfully logged in, the UCA server is not required for the CA50 to function properly
in walkie-talkie mode. If the CA50 loses its login information, the CA50 requires an up and running UCA server to
log in again to enable walkie-talkie functionality. For additional information, see
UCA Server on page
The following basic functionality is present in walkie-talkie mode:
NOTE For a detailed overview of walkie-talkie functionality, see
page 1-3
•
A list of channels is provided to the UCA client when a user logs in. For details about how to set channels,
see XML Profile for Configuration on page
•
Only one voice at a time can be transmitted half duplex on a channel (i.e., the device hears only one channel
at a time; there is no channel mixing).
•
In Normal mode or Scan mode the channel with the highest priority plays.
•
In Single Channel mode only the voice on the selected channel is heard. All other channels are filtered.
•
Walkie-talkie communication has a lower priority than voice (unicast) calls.
• Walkie-talkie communication cannot interrupt a voice (unicast) call.
• The voice (unicast) call overrides walkie-talkie communication.
•
When a voice (unicast) call interrupts walkie-talkie communication, the device returns to monitoring
walkie-talkie traffic after the voice (unicast) call ends.

RF Network Optimization for Walkie-Talkie Communication

•
The recommended RF switch (wireless switch/AP) configuration is for a DTIM interval of 200 ms.
•
Must arrange propagation of CA50 multicast packets to the entire coverage area.
• Simplest case - single subnet.
•
Configure the multicast queue length at the AP large enough to accommodate the walkie-talkie
communication load.
•
Turn off multicast mask.
•
Lower required data rates.
•
Recommend 1 MBps and 2 MBps as the required data rates. No other data rate values should be set as
"required data rates."
Voice (Unicast) Calls on page
6-58.
.
CA50 Modes of Operation 4 - 31
4-36).
Walkie-Talkie (Multicast) Functionality on
7-1.
CA50 Capabilities with an Offline