Polycom 2000/4000 manual View or modify the following fields, 12-23

Polycom RMX 2000/4000 Administrator’s Guide

10View or modify the following fields:

Table 12-1Default IP Service – Conferencing – QoS Parameters

Field	Description
Enable	Select to enable configuration of the QoS settings.
	When un-checked, the system uses the default QoS
	settings.
Type	DiffServ and Precedence are two methods for
	encoding packet priority. The priority set here for
	audio and video packets should match the priority
	set in the router.
	• DiffServ: Select when the network router uses
	DiffServ for priority encoding.
	The default priority is 4 for both audio and video
	packets.
	Note: If you select DiffServ but your router does
	not support this standard, IP packets queue on
	the same communication links with data packets.
	This non-prioritized queuing greatly increases
	the latency and jitter in their delivery.
	• Precedence: Select when the network router
	uses Precedence for priority encoding, or when
	you are not sure which method is used by the
	router. Precedence should be combined with
	None in the TOS field.
	Note: Precedence is the default mode as it is
	capable of providing priority services to all types
	of routers, as well as being currently the most
	common mechanism.
Audio / Video	You can prioritize audio and video IP packets to
	ensure that all participants in the conference hear
	and see each other clearly. Select the desired
	priority. The scale is from 0 to 5, where 0 is the
	lowest priority and 5 is the highest. The
	recommended priority is 4 for audio and 4 for video
	to ensure that the delay for both packet types is the
	same and that audio and video packets are
	synchronized and to ensure lip sync.

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