Panasonic KX-TDA0490 Getting Started

Also see for KX-TDA0490: Programming guide Getting started

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Panasonic KX-TDA0490 Getting Started Manual pdf 53 page image

A1 VoIP RequirementsGetting Started 53Are layer 2 or higher switches used?Use of repeater hubs can increase the network load, and therefore will result in degradation in speechquality.To ensure high speech quality, use only layer 2 or higher switches.NoteAlso note that the port of the switch that connects to the card should be set to operate under"Auto Negotiation" mode. This will help assure error-free communication between the card andthe switch.Are Category 5 (CAT5) cables used?When connecting network devices, make sure to use CAT5 cables. If other types of cables are used,communications may not be carried out normally.A1.4 QoS (Quality of Service)Some routers permit the configuration of priority control features. This allows the router to give higherpriority to voice packets and lower the rate of loss and delays during transmissions, hence improvingspeech quality. It is strongly recommended that you use this feature, especially in networks wheretraffic is heavy.Typically, a router identifies what packets to pass in priority by checking the value in the ToS field ofthe header of IP packets. The VoIP Gateway Card has the ability to set the ToS field of outgoing voicepackets (see "2.2.3 Voice Communication Parameters" in the VoIP Gateway Card ProgrammingGuide). When the card is appropriately configured, the router can give voice packets from the cardhigher priority.Consult your network administrator when setting the ToS field, as the setting value must conform tothe router's specifications.NoteSome switches also permit the configuration of priority control features. For more information,consult your network administrator.*2 For the actual setting values, refer to "2.2.2 H.323 Parameters" in the VoIP Gateway CardProgramming Guide.