User`s guide

HTML SET UP & DIAGNOSTIC
Failsafe ring SHDSL switch User’s guide ref 9014809-03 Page 59
The Internet Assigned Numbers Authority (IANA) controls the assignment
of IP multicast addresses.
The range of addresses from 224.0.1.0 through 238.255.255.255 are
called “globally scoped addresses”. They can be used to multicast data
between organizations and across the Internet.
The range of addresses from 239.0.0.0 through 239.255.255.255 contains
limited scope addresses or administratively scoped addresses. These are
defined by RFC 2365 to be constrained to a local group or organization.
Routers are typically configured with filters to prevent multicast traffic in
this address range from flowing outside an autonomous system (AS) or
any user-defined domain. Within an autonomous system or domain, the
limited scope address range can be further subdivided so those local
multicast boundaries can be defined. This also allows for address reuse
among these smaller domains.
Note This address range is only for the group address or destination
address of IP multicast traffic. The source address for multicast
datagrams is always the unicast source address.
To configure the multicast gateway,
• Select the “transparent” and then the “multicast” menus.
• Enable the multicast gateway and set up the parameters as follows :
“RS232/485 input buffer size” parameter
Set up the maximum length of an asynchronous string the gateway will
store before transmitting it to the IP network.
“Timeout of RS232/485 end of frame” parameter
Set up the delay the gateway will wait before declaring complete a string
received from the asynchronous device.
Once declared complete, the gateway will transmit the string to the IP
network.
“TCP port” parameter
Set the port number the gateway has to use.
Multicast group IP address
Enter the multicast IP address assigned to the group with respect to the rules of
the IANA authority.