EWB100 Usage and Deployment Guide
Rev 1.13
Page 44
8 Walkie Talkie
8.1
Basic Concepts
One of the primary features of the EWB100 is the
“walkie talkie” like voice
capability.
A user pushes the “Push to Talk Button” and a voice stream goes out
to all other devices.
This section will describe the implementation of the WTT client on the EWB. As
mentioned earlier, it is compatible with the Team Express Clients that run on
other Motorola devices.
There are 32 channels available which are labeled 1-32. For a given device one
of those channels is considered the
default configuration channel (or “home
channel”) and is the channel that the voice stream will be sent upon by default
when the PTT button is pressed. There are a variety of mechanisms for switching
to other channels that will be discussed later in this document, such as profiles
and “alternative channels”. The default configuration channel is set by a
configuration command on a per profile basis.
When a user pushes the PTT button, there will be a brief delay followed by one
of t
wo tones. The first tone is a “goahead” tone that indicates the user may start
speaking. The second tone is “busy” tone, which indicates some other user has
already gained access to the channel, although they may not have started
speaking yet. This second tone is also played if the user presses the PTT key
while a voice stream is already being played.
While the device can only transmit on a single channel at any given moment, it
can listen to any number of channels at the same time. In the simplest model, the
device will listen only on the current home channel, but there are many cases in
which the user may want to listen to multiple channels but only transmit on one of
them by default. The EWB supports this mode by defining a channel map that
indicates which channels it wants to listen upon. The voice streams on the
selected channel will be passed through to the user. The receive channel map is
set by a configuration parameter on a per profile basis.
When a user receives a voice stream on a channel other t
han the defined “home
channel”, the device will switch the transmit channel to the incoming channel for
a short, configuration defined, time. This allows a user to respond on a channel
upon which they are listening, just by using just the PTT key.
Summary of Contents for TEAM Badge (EWB100)
Page 12: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 12 ...
Page 37: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 37 ...
Page 39: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 39 ...
Page 49: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 49 set pr rxwttmask 0 z where z 1 x 1 1 y 1 ...
Page 57: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 57 ...
Page 134: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 134 Wait while the driver installs Wait ...
Page 146: ...EWB100 Usage and Deployment Guide Rev 1 13 Page 146 ...
