Preventing Problems; Voice Volume; Transmission Delays - Panasonic KX-TDA0480 Getting Started Manual

5.1 Preventing Problems

5.1 Preventing Problems
Although the features of the IP Gateway Card go a long way toward assuring clear voice
communications and error free fax transmission over digital data networks, some network
conditions can cause performance degradations.

5.1.1 Voice Volume

In some applications, voice volume may be either too low or too high. The gain control feature
operates on both the incoming and outgoing sides and is referred to as the PAD control. The
IP 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 voice
signals 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 IP
Gateway Card Installation Manual.

5.1.2 Transmission Delays

Transmission delays can cause delays and loss in voice communications and fax
transmissions. 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 hops
is kept to a minimum. In the figure below, the Hybrid IP-PBX is located as close to the WAN
interface as possible.
Too many HOPS!
36 Getting Started
Router
Switch
Switch
Hub
IP PBX
Better!
(IP PBX located nearest WAN access point)
Router
Switch
Switch
Hub
IP PBX