Setting Up A Multicast Remote; Time-To-Live; Changing Port Numbers For Multicast - Comrex ACCESS MultiRack Product Manual

The important settings for Multicast are:
• Sender/Receiver - Determines whether this particular MultiRack is designed to generate and encode the
IP Multicast stream (send) or decode one (receive).
• Encoder Type - Determines the algorithm format of stream to be used by the Multicast encoder—not
relevant for decoders.
In addition to the basic options for IP Multicast profiles, clicking the Advanced box will allow setting of the same
Advanced Options available for Normal BRIC (Unicast) profiles.

settIng up A multIcAst remote

All Multicast connections are outgoing connections. A Multicast Sender must initiate an outgoing stream, and a
Multicast Receiver must initiate an incoming one. These remotes are configured within a special address range
known as a Multicast Block, typically 224.0.0.0 to 239.255.255.255. To establish a Multicast connection, simply
define a remote as having an address within the IP Multicast Block, use an IP Multicast profile, and press Connect.

tIme-to-lIVe

Time-to-Live (TTL) is a variable set by Multicast encoders to determine how long a packet is processed before
it is dropped by the network. The default value of TTL in MultiRack is 0, which limits its use to within a LAN
environment. TTL may be manually changed on a Multicast Sender remote by configuring the IP address
followed by a "/", followed by the TTL value. An example remote Multicast encoder could be set for the address
224.0.2.4/255, which would signify an address with the Multicast Block with a TTL of 255 (which is the max value
available).

chAngIng port numbers For multIcAst

The default port of UDP 9000 may also be changed on Multicast remotes. The port number is assigned in the
standard socket format, directly after the IP address, preceded by ":", followed by the TTL. As an example, the IP
address of a Multicast Sender on port 443 with a TTL of 100 would read: 224.0.2.4:443/100.
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