Jitter Buffer; Voice Activity Detection (Vad) - Panasonic KX-NS500 Installation Manual

Note
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This VLAN feature complies with IEEE (Institute of Electrical and Electronics Engineers) 802.1Q.
•
The PBX receives VLAN settings only from the connected switching hub. Therefore, VLAN settings for
the PBX must be assigned at the switching hub.
•
When using the VLAN feature on the network, make sure that the main unit is connected to a layer 2
switch that is IEEE 802.1Q compliant, and that is configured for VLANs. In addition, the port of the
switching hub to which the card is connected must be set to "Untagged". Consult your network
administrator for details.
•
When using the VLAN feature on the network, make sure that the switching hub to be connected is
IEEE 802.1Q compliant and is configured for VLANs. In addition, the port of a switching hub that the
IP telephone is connected to must be set to "Trunk" port, to allow VLAN tagging. Consult your network
administrator for details.
•
Some PC LAN cards allow VLAN settings to be assigned. However, when using a PC connected to an
IP telephone with 2 ports, the VLAN settings for PC communications must be assigned only to the
secondary port of the IP telephone. Any VLAN settings assigned to the PC LAN card must be disabled.
These settings can usually be identified by "802.1Q", "802.1p", or "VLAN" in their name.
•
If you are using an IP telephone with a primary port only (e.g., KX-NT265), a PC cannot be connected
to the IP telephone.

8.1.4 Jitter Buffer

When voice signals are packetised and transmitted, individual packets can take different paths through the
network and arrive at the destination at varied timings. This is referred to as "jitter", and it can cause degradation
in speech quality. To compensate for jitter problems, the "jitter buffer" accumulates the packets temporarily for
processing.
To set the size of the jitter buffer, refer to "9.2.2 PBX Configuration—[1-1] Configuration—Slot—System
Property—Site—VoIP-DSP Options" in the PC Programming Manual.

8.1.5 Voice Activity Detection (VAD)

VAD conserves bandwidth by detecting silent periods during a call and suppressing the packets of silence from
being sent to the network. This feature can be enabled or disabled for codec G.711.
To configure the VAD feature, refer to the appropriate section in the PC Programming Manual.
8.1.5 Voice Activity Detection (VAD)
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