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| Section 6
Multicast TTL
– TTL stands for “Time to Live.” It is a value in every IP packet sent that is decremented every time
the packet passes through a router. When the number hits zero, the router won’t pass it any further. It is a tool that
is useful in restricting how far in a network information is allowed to go. Although the Z/IP ONE cannot subscribe
to multicast stream of compressed audio, it can send an encoded RTP stream to a multicast address. This can be
used to let the switches and routers in a managed network replicate the Z/IP ONE’s stream to many receivers. By
default, multicast packets have a TTL of 1, which means they cannot be routed.
If your managed network requires multiple hops for multicast traffic, you can customize the time to live here.
HTTP/Web Server Port
Allows you to change the Z/IP ONE’s management web interface. Entering a 0 in this field
uses the standard, port 80. Since the standard port (and the unofficial, but relatively common management ports
of 8800 and 8080) are well known, a Z/IP ONE on the public internet should have its web server set to a unique,
non-standard port.
This can also be used to allow management of multiple Z/IP ONEs that are behind a router that supports port
forwarding, but not port translation.
6.2 Audio Codec
The
Audio Codec
menus allow the user to change various settings related to the audio and transmission quality,
and also to select the appropriate compression scheme. For more detailed information on audio encoding and the
codecs used in the Z/IP ONE, see Appendix B.
As you change the profile, the other settings on this screen are updated to show what will be used by that profile.
All preset profiles use AAC-ELD between 8kbps and 64 kbps. They differ in the minimum and maximum buffer
settings.
If you select User Setting for your profile, the options you choose below are used. Changing any of these options
when you are on a preset profile will change the profile to User Setting automatically.
If you set the bitrate minimum to be the same as the bitrate maximum, and also set the buffering minimum to the
same as the buffering maximum, the Agile Connection Technology (ACT) algorithm will be disabled, even for
codecs which support ACT.
♦
Encoding Mode
selects how the Z/IP ONE encodes the audio that it sends to the remote codec. Different
codecs support different features and bit rates. Changing encoders will change the range of the rates that
can be selected under
Bitrate Minimum
and
Bitrate Maximum
.
