Cisco TelePresence 7010 Help Manual page 46

Configuration
Table 28: Default advanced endpoint settings (continued)
Field Field description
Maximum Sets the maximum size (bytes) of video
transmitted video packets sent by the TelePresence Server,
packet size including IP headers.
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.
Received video: Allows the TelePresence Server to request
flow control on that the endpoint or endpoint group send
video errors lower speed video if it fails to receive all the
packets which comprise the far end's video
stream.
Note that flow control is only supported for
some endpoints.
Received video: Allows the TelePresence Server to request
flow control that the endpoint or endpoint group send
based on viewed lower speed video if the use of the video
size from that endpoint does not require as 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 can be overridden by the
corresponding setting on an individual
endpoint's Advanced 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.
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.
The default is enabled.
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.
The default is enabled.
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