?? broadcasting.htm
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<H2><A NAME="broadcasting"></A>Broadcasting to multiple sites</H2>
<P>The most efficient way to transmit audio to a group of sites
is <A HREF="multicasting.htm">"IP Multicasting"</A>, which
allows the creation of conference groups that individual hosts
can join and leave at will. A multicast conference is far more
efficient than sending duplicate messages to all recipients.
Unfortunately, many networks do not support, or have not
enabled Multicasting, and often setting up Multicast groups
requires the involvement of a site's system administrator,
making it difficult to use for informal, <I>ad hoc</I>
groups.</P>
<P><i>Speak Freely</i>'s Broadcast facility provides an alternative
which requires no special network configuration. Without the
benefit of Multicasting is it forced, however, to send
duplicate packets to each recipient, which usually works only
on fast local networks. Since many educational institutions
and enterprises have such networks, broadcasting can be an
effective way to transmit classes, seminars, and meetings to
multiple destinations within the organisation.</P>
<P>Broadcasting is activated by checking the
Connection/Broadcast menu item. Audio input is sent to all
currently-open connections and the title bar displays a legend
indicating a broadcast is in progress. When a broadcast is
underway, other hosts can "subscribe" to the broadcast simply
by making a connection to the broadcasting host and sending a
short (say, one second) burst of sound to it. (The sound is
discarded by the broadcasting host and will not affect the
broadcast). This opens a connection to the new host, which
will then begin to receive the broadcast. A host can
unsubscribe from the broadcast by sending another short burst
of sound. To prevent rapid toggling between subscribed and
unsubscribed state, at least 10 seconds must elapse between
subscribe and unsubscribe requests, and transmission to a host
may continue for up to 10 seconds after it sends an unsubscribe
request.</P>
<P>Toggling broadcasting off immediately ceases the
transmission. Connections established during the broadcast
will time out according to the normal rules unless additional
sound is received from them or sound is explicitly sent to
their connection. During a broadcast, mouse and keyboard input
to connection windows is ignored; all connections remain in
transmit mode, as indicated by the ear icon when the mouse is
over a connection window.</P>
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