Sony PCS-1/1P - Manual (Page 207)

207
Glossary
App
end
ix
MCU
An abbreviation for Multipoint Control
Unit. When connecting a MCU, a multipoint
videoconference can be held.
MLP
Data communication is also available during
communication of video/audio signals
between the videoconferencing systems.
The MLP or HMLP is a protocol for data
communication such as NetMeeting. Using
the HMLP protocol allows faster data
transmission.
MPEG4
A video coding algorithm recommended by
the ISO/IEC based on the H.263+ standard.
Adding some tools provides some
improvement of picture quality compared
with the H.263+ standard. The MPEG4
format is commonly used for personal
computers, cellular phones, etc.
P in P
An abbreviation for “Picture in Picture.”
This is a function which allows you to
monitor your own party on a small window
on your TV monitor.
QCIF
An abbreviation for Quater CIF. The number
of pixels is a quarter than one of CIF format.
176 pixels × 144 lines
Secondary terminal
Normally, a multipoint videoconference is
not available unless the video and audio
modes and transmission rate of the
videoconferencing systems of all the sites
are the same.
*1
For a multipoint
videoconference the terminal that can be
connected in the same modes is called a
primary terminal, while a secondary
terminal is the terminal in which some of the
functions are restricted since the connection
is not enabled with the same modes. The
restriction on the functions depends on the
conditions described in “Notes on
Secondary Terminals” under “Chapter 8
Multipoint Videoconference”.
For example, this system does not transmit
video signals to a terminal that has no
common formats but can communicate via
audio signals. In this case, the terminal in
which picture viewing is not available is
regarded as a secondary terminal.
*2
A
terminal communicated via a normal phone
included in the multipoint videoconference
is also called a secondary terminal. For
details on secondary terminals, see “Notes
on Secondary Terminals” on page 172.
*1 Difference between the NTSC and PAL
color systems is permitted.
*2 Receiving the video signals from this
terminal may be available with the system.
SNMP
An abbreviation for Simple Network
Management Protocol. This protocol is for
management information between the
management station and the managed
terminals.
SPID
An abbreviation for Service Profile ID.
Sub-address
An identification number given to devices
sharing a common ISDN line .
TOS
Inputting the information data in the TOS
field of the IP address allows the
communication system to judge the packet
transmission priority, etc. It also enables
change of path according to the types of
service (Delay or Size).