Maintenance Manual

Video format Sets the format for video transmitted by
the MCU.
■ NTSC
The MCU will transmit video at
30 frames per second (or a
fraction or multiple of 30, for
example: 15fps or 60fps)
■ PAL
The MCU will transmit video at
25 frames per second (or a
fraction or multiple of 25, for
example: 12.5fps or 50fps)
This option should be set to match your endpoints'
video configuration. If you set this incorrectly, the
smoothness of the video both to and from the endpoints
might suffer.
NTSC is typically used in North America, while PAL is
typically used in the UK and Europe.
Maximum
transmitted
video packet
size
Sets the maximum payload size (in
bytes) of the packets sent by the MCU
for outgoing video streams (from the
MCU to connected video endpoints).
We recommend that you use the default setting (1400
bytes) wherever possible. If you need to reduce the
maximum payload size, we recommend a value of at
least 1000 bytes; a maximum payload size that is too
low reduces the overall bandwidth efficiency and may
impact performance.
Video streams generally contain packets of different
lengths. This parameter only sets the maximum size of
a transmitted network datagram. The MCU optimally
splits the video stream into packets of this size or
smaller. Thus, most transmitted packets will not reach
this maximum size.
Interlaced
video
optimization
Controls whether the MCU restricts
video resolutions in order to reduce the
effect of interlacing artifacts.
You should only enable this option if you are seeing
video interlacing artifacts or on the advice of Customer
support. Note that all resolution restrictions imposed by
this setting apply only to video being sent from
endpoints to the MCU.
Video receive
bit rate
optimization
Enables the MCU to send bandwidth
control messages to optimize the video
bandwidth being used.
The MCU can send these messages to endpoints
requesting that the bandwidth of the video that they are
sending be decreased or increased, up to the maximum
bandwidth of the channel.
If the participant is very prominent, then the MCU will
ask the endpoint to send video at a high bandwidth. If
the participant is not being viewed at all (or only being
viewed in very small view panes), the MCU will request
that the video is sent at a lower rate to conserve
network bandwidth.
Note: When an HD-capable MCU is in one of the HD,
HD+, or Full HD modes, this option is automatically
enabled.
On the MCU 4500 Series and the MCU MSE 8510, the
optimizations are enabled in the HD modes but the
control to disable them is deactivated; however, on the
MCU 5300 Series, you can disable the optimizations
when the MCU is in one of the HD modes. For more
information, refer to Configuring media port settings.
158
Cisco TelePresence MCU Series Online Printable Help