Panasonic KX-TDA0480 Getting Started Manual

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5.1 Preventing Problems36 Getting Started5.1 Preventing ProblemsAlthough the features of the IP Gateway Card go a long way toward assuring clear voicecommunications and error free fax transmission over digital data networks, some networkconditions can cause performance degradations.5.1.1 Voice VolumeIn some applications, voice volume may be either too low or too high. The gain control featureoperates on both the incoming and outgoing sides and is referred to as the PAD control. TheIP Gateway Card is able to optimize the gain or loss level of the voice signals.In most cases, it should not be necessary to modify the default PAD In (PAD value of the voicesignals coming in to the unit)/PAD Out (PAD value of the voice signals going out from the unit)settings. Indications that some adjustment is required are:Voice level too low: Increase gain by decreasing PAD level.Voice loud/distorted: Decrease gain by increasing PAD level.Excessive background noise: Decrease gain by increasing PAD level.To configure, please refer to Section 4.9.1 Configure Gateway Units (KX-TDA0480) of IPGateway Card Installation Manual.5.1.2 Transmission DelaysTransmission delays can cause delays and loss in voice communications and faxtransmissions. These conditions typically arise when there is a high traffic on the LAN/WAN,causing excessive packet collisions.One preventative measure is to install Hybrid IP-PBX so that the number of transmission hopsis kept to a minimum. In the figure below, the Hybrid IP-PBX is located as close to the WANinterface as possible.IP PBXRouterSwitchToo many HOPS!SwitchHubIP PBXRouterSwitchBetter!(IP PBX located nearest WAN access point)SwitchHub

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