Interoperability Now
6-1
6
NXU-2A FAQ (Frequently Asked Questions)
6.1
General
This section provides answers to some frequently asked questions about the installation and
operation of the NXU-2A.
How much network bandwidth does the NXU-2A consume?
The NXU-2A bandwidth usage varies depending on the application. When COR is inactive
and no audio is being transmitted across the link, the bandwidth usage is essentially zero, since
a small “keep-alive” packet is only sent every 4 seconds. When COR is activated and the
default voice compression method is used, audio will be sent across the link at approximately
15Kbps. If a full-duplex connection is active (COR is active on each end) then the total
bandwidth usage for audio will be approximately 30Kbps. Selecting a different voice
compression method will increase the bandwidth accordingly. Voice compression method 2
will require approximately 18Kbps (half-duplex), method 3 will require 27Kbps, method 4 will
require 36Kbps, and method 5 will require approximately 70Kbps. If RS-232 data is being sent
simultaneously then the bandwidth will be increased by the RS-232 data rate, plus the TCP
overhead.
Can I use the NXU-2A on a dialup connection?
No. The NXU-2A’s network connection is via Ethernet. Most dialup (telephone line) modems
only provide RS-232 connections, but even if an Ethernet connection to a dialup is available,
the NXU-2A may not operate properly since the connection speed is not guaranteed on a dialup
connection. Poor telephone lines or varying line conditions may cause a dialup modem to
reduce its connection speed without the user being aware of this condition. For this and other
reasons, dialup connections are not supported by the NXU-2A.
My application does not provide a COR line. What should I do?
COR is usually obtained from a radio and indicates that a signal is being received. If you do
not have a COR line, or a line that performs this function, then you can either tie the NXU-2A
COR line to its active state or you can use VOX mode. VOX mode is preferred since enabling
COR permanently will cause data to flow continuously across the link, even if no audio is
present.
I have a 100 Mbps Ethernet. Can I connect the 10 Mbps port on the NXU-2A to my network?
Most 100Mbps equipment (hubs, switches, routers) will work with either 10Mbps or 100Mbps
connection, so it should work without any problems. Check with your network administrator if
you’re unsure about your network equipment capabilities.
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