NEC UNIVERGE SV9100 Manual page 45
Voice over ip
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Also See for UNIVERGE SV9100:
- Features and specifications (1403 pages) ,
- Programming manual (954 pages) ,
- Manual (766 pages)
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VoIP LAN Link Speed Information (Release 3)
The SV9100 can now display the LAN link information for duplex and speed of either the CPU or
VoIPDB interfaces.
Easy Edit –
Advanced Items/VoIP/General Settings/VoIP Configuration/VoIP LAN Link Speed Information
LAN Link Speed of CPU - Displays the duplex and speed of the LAN connection between the CPU interface
and network switch.
(PRG90-77-01)
LAN Link Speed of VoIP - Displays the duplex and speed of the LAN connection between the VoIP interface
and network switch.
(PRG90-77-02)
Modifying MTU Size (Release 3)
The MTU is the Maximum Transmission Unit. It means the size of the largest packet that a network
protocol can transmit. When the quantity of data to send from the system exceeds the MTU, it will
divide for each MTU and transmit in multiple steps.
Generally a larger MTU brings greater efficiency because each network packet carries more user
data. But in some environments of low communication quality, a smaller MTU brings better efficiency
since the resending of data by error decreases.
Therefore the MTU size for both the CPU and VoIPDB interfaces can be change depending on the
environment, in order to improve the communication efficiency.
Easy Edit –
Advanced Items/VoIP/General Settings/IP Addressing/CCPU IPL IP Network Setup
CCPU MTU - Allows the MTU size to be modified between 100-1500 bytes for the CCPU interface. Default
value is 1450.
(PRG10-12-18)
VoIPDB MTU - Allows the MTU size to be modified between 100-1500 bytes for the VoIPDB interface.
Default value is 1450.
(PRG10-12-19)
Service Condition
MTU is the maximum size of Layer 2 data. For IP packets, it is the total size of the IP header and IP
data. MTU of the system was 1500 bytes fixed (*), but it will be variable by referring to this system
data.
(*) If VLAN enabled, MTU was 1496 bytes fixed
This system data applies to packets sent from the IP addresses set in the PRG10-12-01 and
PRG10-12-09.
Because this system data applies to OS of main software, it does not apply to the RTP / RTCP
packets generated from DSP of VoIPDB.
Part 2: VoIP Manual
45
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Troubleshooting
