Cisco TelePresence 7010 Help Manual page 93

Endpoints and endpoint groups
Table 49: Network settings (continued)
Field Field description
Maximum Sets the maximum size (bytes) of video
transmitted packets sent by the TelePresence Server,
video including IP headers.
packet size
Note: In TelePresence Server 3.1 and
earlier versions, this setting did not include
IP headers. When upgrading to 4.0, the
TelePresence Server retains the previous
setting which effectively reduces the
maximum video data size by the size of the
IP headers.
If you want to set the maximum possible size
for the video packets, use 1428 for an IPv4
network or 1448 for an IPv6 network.
Table 50: Optimization settings
Field Field description
Optimization Clear the checkbox if you want to enable
the grayed-out Optimization settings.
Received Allows the TelePresence Server to request
video: flow that the endpoint or endpoint group send
control on lower speed video if it fails to receive all
video errors the packets which comprise the far end's
video stream.
Note that flow control is only supported for
some endpoints.
Received Allows the TelePresence Server to request
video: flow that the endpoint or endpoint group send
control lower speed video if the use of the video
based on from that endpoint does not require as
viewed size high a speed as the channel allows.
Note that flow control is only supported for
some endpoints.
Cisco TelePresence Server 7010 and MSE 8710 in Locally Managed Mode Printed Help (4.0)
Usage tips
This setting overrides the corresponding setting on
the Default endpoint settings
Video streams generally contain packets of
different lengths. This parameter only sets the
maximum size of the packet. The TelePresence
Server optimally splits the video stream into
payloads of this size or smaller, and most will not
reach this maximum size.
We recommend using the default (1400), or higher,
unless there is a known packet size restriction in
the path. This allows the TelePresence Server to
make the most efficient use of the available
bandwidth.
If the packets are too large for a network that
requires a smaller maximum transmission unit
(MTU), network elements may fragment and
reintegrate the packets which can impair
performance.
Usage tips
The checkbox is checked by default, which means
the endpoint uses the TelePresence Server's default
endpoint optimization parameters (on
> Default endpoint settings).
After clearing the box, any changes you make to the
optimization parameters will apply to this endpoint
only.
The TelePresence Server can send these messages
to endpoints requesting that the bandwidth of the
video that they are sending be decreased based on
the quality of video received by the TelePresence
Server.
If there is a bandwidth limitation in the path between
the endpoint/endpoint group and the TelePresence
Server, it is better for the TelePresence Server to
receive every packet of a lower rate stream than to
miss some packets of a higher rate stream.
Typically the TelePresence Server would send a
flow control message because of this setting if the
video from that endpoint was not being seen by
other conference participants.
page.
Configuration
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