TEMA TELECOMUNICAZIONI
AD630VoIP SIP 25W / PoE Horn
MAS-AD630-REV02EN
Page 11 of 48
6.4.
Multicast Audio Streaming
In a LAN network, the Multicast term indicates the possibility to distribute an information like data, audio or video, to
a group of IP terminals of the Ethernet network. For Multicast are used class D IP addresses and they range from
224.x.x.x to 239.x.x.x. In our case the AD630 system is able to receive audio in Multicast into the specific IP
channel and play it amplified. The audio can be generated from a PC software application (for example VLC) or by
a IP SIP phone. The received audio stream is played without the intervention of any operator, this function is useful
for playing back voice messages and information or emergency announcements (also called "Paging" mode).
Obviously the Multicast audio streaming is unidirectional, the audio stream is sent from source to destination, but
not vice-versa. The audio stream can be sent simultaneously to multiple terminals (same IP Multicast), or only to
distinct terminals (each provided with its own IP address). It is possible to program up to 16 audio receive
addresses, each with its own priority and its playback volume, so that the same terminal, if it is already playing
audio (eg music) can be interrupted by a higher priority stream (for example an announcement) and with a different
volume (typically an announcement must be played at a higher volume than background music). The audio
supported by this mode is in the G.711 format (aLaw or
µ
Law), G722 or linear high quality 16 bit (proprietary
format, diffused through the AD615 device or an Intercom AA-540).
Example 1
In a plant, there are two systems, connected to the same network switch. From a suitable phone, it is possible to
make a voice announcement via multicast address 239.255.12.42:
Both systems will play the announcement audio message. Many more devices than those given in the example can
be connected, since there are no limits.
Example 2
In the plant there are two systems with different Multicast addresses.
The phone, selecting to send the multicast voice to one or other address of the terminal, will decide which device
must play the streaming message.
7. COMMANDS AND CODES
During the announcement will be possible to send the commands described here (which will be these by default):
DTMF Command
Function
Description
#1 - #2
Activate the relay contact
1 or 2
Used to manually activate the relays if not
programmed to be automatically activated per
announcement.
#5
Extension of announcement
time
AD630 alert the operator with some tones 30 seconds
before
the
expiration
of
the
time
for
the
announcement. Having to extend the announcement
over the set time it is possible to recharge original time
to continue the conversation (with this code).
Phone Extension
designed for
Multicast
LAN Switch
AD630 n. 1 Multicast address
239.255.12.42
AD630 n. 2 Multicast address
239.255.12.42
Phone Extension
designed for
Multicast
LAN Switch
AD630 n. 1 Multicast address
239.255.12.42
AD630 n. 2 Multicast address
239.255.12.41