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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 6
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 149.
*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 .
Terminal adaptor
A device used to connect various equipment
to a digital line. The device sits between the
equipment and the digital line and checks
that signals are correctly sent or received.