NXU-2A Operations Manual
3-8
Interoperability Now!
3.3.13
Voice Compression Settings
In order to send voice information over an IP network efficiently the NXU-2A uses digital
signal processing algorithms to compress the voice information so that it requires less network
bandwidth. The NXU-2A offers several different voice compression methods to support a
variety of applications. For example, some compression methods work well with voice and
provide a high amount of compression, but do not handle signaling tones very well. Other
methods handle tones and voice, but use more network bandwidth because they offer less
compression. You may select the method from the following voice compression schemes that
optimizes the trade-offs for your particular application:
1. GSM 13Kbps
- Suitable for voice communications only. Should not be used if any tone
signaling is required. Offers the greatest compression with reasonable voice quality. This is the
default setting.
2. ADPCM 16Kbps
– Suitable for voice or tone signaling. Offers good voice compression, but
the voice quality is lower than the other compression methods.
3. ADPCM 24Kbps
– Suitable for voice or tone signaling. Offers less compression than
ADPCM 16Kbps but the voice quality is higher.
4. ADPCM 32Kbps
– Suitable for voice or tone signaling. Offers still less compression, but
the voice quality is the best of the ADPCM compression types.
5. PCM 64Kbps
– Suitable for voice or tone signaling. Offers the highest quality of all
compression methods, but provides the least compression.
You should use this method only if
your network offers low latency and good throughput
.
You may select a compression method with the VOCODER command followed by the number
of the compression method (1-5). If you are only using voice in your application, you should
select GSM 13Kbps (1). If you plan to use any tone signaling, you should select 2, 3, 4, or 5 in
accordance with your network bandwidth and voice quality requirements.
3.3.14
Security Settings
The NXU-2A may be configured, monitored, and controlled remotely via its network interface
using a web browser or a telnet client. In some instances, it may be desirable to limit access via
one or both of these methods, or to selectively limit the things that may be done remotely. The
SECURITY command allows various levels of security to be set in order to limit remote
access. Additionally, a password may be assigned to limit access via a web browser. Refer to
the chapter on Security for detailed information on setting the NXU-2A security parameters.
3.3.15
Ethernet MAC Address
The Ethernet MAC address of the NXU-2A may be read using the
MAC
command. When
MAC
is typed the 48-bit Ethernet MAC address will be printed as a sequence of two digit
hexadecimal numbers separated by dashes. No two NXU-2A units have the same MAC
address, so this may be used as an electronic serial number if desired. It cannot be changed by
the user.
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