NXU-2B Operations Manual
3-17
Interoperability Now!
3.5
Communications Mode
The NXU-2B has three communications modes: Normal, Connectionless, and Multicast.
The default mode is Normal; this consists of a TCP connection initiated by a client unit to a server
unit for traffic to be exchanged between the two units’ serial ports along with a unicast UDP
channel for VoIP traffic. This is the standard mode and should be used for one-to-one unit
operations.
Connectionless mode consists solely of a unicast UDP channel for VoIP traffic (along with the
status bits such as PTT and COR) between the NXU-2B and another unit. No serial traffic is
exchanged. This mode is reserved for special applications such as the JPS WAIS (Wide Area
Interoperability System) and should not be used for day-to-day operation.
Multicast is a network routing technique that allows IP packets to be sent simultaneously from a
single source to multiple destinations. Rather than sending the packet to each destination
independently, the packet is sent to a multicast group identified by a single, specialized, Class D
IP address. This is an IP address in the range of 224.0.0.0 to 239.255.255.255. Multicast mode
on the NXU-2B consists of a multicast UDP channel for VoIP and status bit traffic. No serial
traffic is exchanged. It can be used whenever more than two units wish to hear each other’s
audio.
The NXU-2B communications mode can be set using the BCAST command or Communications
Mode pulldown menu from the web page. BCAST 0 sets the unit to Normal mode, BCAST 1
sets the unit to Connectionless mode, and BCAST 2 sets the unit to Multicast mode. Once again,
Connectionless mode is reserved for special applications and should not be used for day-to-day
operation. Its use outside the advisement of JPS Interoperability Solutions is not supported.
To use a set of NXU-2Bs in Multicast mode, they must all be put into the same multicast group.
To do this, first select a Class D IP address, port, and vocoder for use by the entire group.
Then configure each NXU-2B in the group so that:
•
Its server IP address is the IP address of the multicast group.
•
Both its server port and VoIP port are the ports selected for the multicast group.
•
It’s set to use the vocoder selected for the group.
Once these configuration steps are complete, packets sent by any unit in a multicast group will
be received by all other units in that group.
Note: Please note that multicast operation is guaranteed to work only in LAN
environments or private WANs where multicast-enabled routers are in use.
Multicast mode will not work over the Internet because not all routers on the
Internet are multicast-enabled.
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