User`s guide

Chapter 8: Magnum Router Specialized Functions
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8-4
This utilizes the frame switching capabilities of the Magnum Router by directing traffic from the
PUBLIC DLCI of 100 to the PRIVATE DLCI of 105 and vice versa.
A PUBLIC DLCI cannot be both a virtual DLCI and a “direct connect” DLCI at the same
time.
Micro-Band Voice Over IP
Micro band Voice over IP is the Magnum Routers unique ability to encapsulate all Frame-Relay
data, including Marathon legacy data and voice, into IP packets and cause them to traverse any
IP network, including the public Internet.
MVoIP means that existing Micom Marathons that use dedicated leased lines or public frame
relay circuits can now be deployed for use over the Internet, VPN’s or corporate WAN networks
that utilize IP.
Programming the Magnum Router to use MVoIP is an easy task so long as a few simple steps
are followed:
• A WAN Configuration entry that connects one of the Magnum Router WAN ports to the
Ethernet port using a DLCI from 900 to 989
• A WAN IP Route entry
• Two available IP addresses
o One for the Ethernet port of the Magnum Router
o One as the Source IP address in the MVoIP screen
As noted, the MVoIP uses a DLCI from 900 through 989. This does not mean that those DLCI’s
are exclusive to MVoIP only. The Magnum Router looks at all connections in the WAN
connection table, only DLCI’s from 900 through 989 with a connection to the E1 port are
automatically considered to be MVoIP connections. The DLCI’s 900 through 989 can also be
used for standard WAN DLCI’s to the carrier network, but cannot be in both places at the same
time.
MVoIP uses a UDP transfer protocol that uses a port number that is 60000 + the DLCI number
being used. Thus, an MVoIP connection that uses DLCI 900 would have a UDP port of 60900.
If the Magnum Router is behind a firewall, proxy server or some other security device then it
important that the port being used by the MVoIP be opened in both directions.
Another important item to note is that the MVoIP causes the Magnum Router to act like any
other IP host device on a network, and is then subject to LAN traffic problems that may arise.
These can cause several different problems, depending on the configuration, that include voice
choppiness and data slowdown.
Running the MVoIP over a slower link speed, such as a 128k DSL line, can also cause voice
and data problems due to the limited bandwidth and demands of the end users. If the MVoIP is
to be deployed across the Internet, it is advised that the uplink and downlink speeds of both
sites be at least 384k or higher.