4
Continuous-presence Mode With
Voice Activated Switching
The PCS-XG80 supports both four-screen and
six-screen continuous-presence modes in 720p HD
format, which provides clear images even on the
smaller sub screens. When using voice activated
switching in continuous-presence mode, the
far-end site that is actively speaking is displayed on
the largest of the six sub screens.
In addition, voice activated switching is available
when the unit is in full-screen mode. Plus, of course,
fi xed-site videoconferencing is available as well.
Six-site Continuous Presence Mode With Voice Activated Switching
Stable and Secure Videoconferencing
Enhanced Intelligent QoS™ (Quality of
Service) Functions to Achieve Stable
Transmission
To handle the transmission of large amounts of HD
video data while maintaining high-quality and stable
communication over an IP network, the PCS-XG80
incorporates the following advanced QoS functions:
• Adaptive FEC (Forward Error Correction)
• Real-time ARQ™ (Automatic Repeat reQuest)
• ARC (Adaptive Rate Control)
These functions work “harmoniously” for fast and
consistent data throughput during the transmission
of video signals by adapting to any changes in
the network condition and correcting any packet
loss. For more information on the intelligent QoS
mechanism, refer to the “Technical Note” insert.
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If FAR 5 is talking
If FAR 2 is talking
(simulated images)
With Enhanced Intelligent QoS
Without Enhanced Intelligent QoS
Advanced Encryption Standard (AES) for
High Security
Secure videoconferencing over a network is
possible because the PCS-XG80 supports 128-bit
AES encryption. The system’s encryption complies
with the ITU-T H.233/H.234/H.235 standards,
which allows encrypted communication with
other compliant systems. When the encryption
mode is active, video, audio, and presentation
data are encrypted for the duration of the
videoconference.
Technical Note – Intelligent QoS Functions
Sony has implemented a number of QoS
functions in all of its currently available visual
communication systems. However, conventional
QoS methods used with SD systems are
inadequate when handling large amounts of
data associated with high-defi nition (HD) video.
Therefore, Sony has designed and implemented
enhanced intelligent QoS functions in its HD
visual communication systems.
Two major improvements have been made
on the previous methods. First, the system
intelligently allocates the amount of ARQ, FEC,
and video data based on the bandwidth
available, which is determined by the ARC
function. Second, FEC is performed with larger
FEC blocks and the number of parity packets
are adjusted as required. This combination
is both effi cient and effective for transmitting
large amounts of data over IP networks to help
maintain high picture quality.
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SONY54390_PCS Sec1:4
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8/19/08 10:32:13 AM
8/19/08 10:32:13 AM
