NEC UNIVERGE SV9100 Manual page 127

Each CODEC has different voice quality and compression properties. The correct choice of CODEC will be
based on the amount of bandwidth available, the amount of calls required and the voice quality required.
Available Codecs for NetLink
G.711 64Kbps codec MOS 4.4
G.722 64Kbps codec MOS 4.4
G.726 32Kbps codec MOS 4.2
G.729 8Kbps codec MOS 4.0
The bandwidth values quoted for these codecs are for the digitized speech in one direction only. The actual
bandwidth required for a call will depend on many other factors and will be much higher than these figures.
The above MOS values are quoted for ideal network conditions. The value could be lower depending upon
the network performance.
To change the codec in use in a NetLink network use the Audio Capability Priority setting in Easy Edit –
Advanced Items/VoIP/Networking/NetLink/NetLink Codec
NetLink Information
Easy Edit – Advanced Items/VoIP/Networking/NetLink/NetLink Information
These are 'read only' commands where information about the NetLink network can be found.
Primary Information – Displays information about the Primary System. Node ID, IP address and MAC
address etc. (PRG51-12)
NetLink Systems Information – Displays information about all nodes in the NetLink network.
NetLink Remaining Slots – Displays the number of remaining virtual slots. This number decreases every
time a new card is installed from 240 down to Zero. When there are zero slots available no more cards can
be installed.
NetLink TCP Ports
Easy Edit – Advanced Items/VoIP/Networking/NetLink/NetLink TCP Ports
This is a list of TCP ports used by the NetLink protocol. There is normally no need to change these, they
are for information only.
NetLink DT800/DT700 Registrar Ports
Easy Edit – Advanced Items/VoIP/Networking/NetLink/NetLink DT700 Registrar Ports
This is a list of port numbers to define the Registrar and Session UDP port numbers on a per node basis.
These are the port numbers that SIP MLT extensions use for registration and session communication.
There is normally no need to change these from default.
Configuration Examples
Example 1
The example below shows the basic programming required for a three node NetLink network. Each
system is on a separate network. They are configured using the Top Priority Primary System method with
system A being the preferred Primary System. Automatic Primary Integration is enabled and the NetLink
keep alive timer is set to the recommended 20 seconds.
No other advanced options are included here.
System A
(PRG51-09)
System B
Part 2: VoIP Manual
(PRG51-17)
127
(PRG51-11)
System C