Polycom MGC-50 Getting Started Manual page 52

MGC-50/MGC-100 Getting Started Guide
3-28
Table 3-9: QoS of Ethernet Service Options (Continued)
Field
DiffServ and
Precedence
Audio and Video
TOS
c. Click OK to apply your settings and return to the Settings dialog
box.
Description
DiffServ and Precedence are two methods for
encoding the packet's priority in the packet header.
If you are not sure which QoS policy your router
supports, select Precedence combined with None
in the TOS field.
•
Select DiffServ when the network router uses
DiffServ for priority encoding).
Note: If you select DiffServ but your router does
not support this standard, IP packets queue on
the same communication links with data packets
greatly increasing the latency and jitter in their
delivery.
•
Select Precedence when the network router
uses Precedence for priority encoding, or when
you are not sure which method is used by the
router.
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 recommended priority for both audio and video
is 4 to ensure that the delay for both packets is the
same and audio and the video packets are
synchronized.
Type of Service (TOS) defines optimization tagging
for routing the conferences audio and video packets.
•
Delay – The recommended default for video
conferencing.
•
None – No optimization definition is applied.
Select None if you do not know which standard your
router supports.