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Technical Description 3-3
VisuaLink 128/384 General Description
System Control
The System Control circuit manages the many separate functions of
VisuaLink. This circuit provides control for the Codec and other
devices. Various control devices can be used for VisuaLink: VisuaLink
infrared remote control, any analog phone, an NEC VoicePoint+
speaker phone, and a Personal Computer (connected via the RS-232
serial ports).
System Control provides three videoconference control modes:
•
H.281
for multi-location and far-end camera control.
•
H.243 Multipoint Chairman
for multi-location chairman control
and browse functions.
•
T.120 Multipoint Data Sharing & Collaboration
compliance for
multi-location data conferencing.
Line Interface
This circuit provides the correct electrical and protocol connections for
ISDN-1 BRI line interface. VisuaLink 128 supports one NT-1 (Network
Terminal Devices) terminated ISDN-1 BRI line connection.
The VisuaLink 384 has an on-board IMUX (Inverse Multiplexer) which
supports ISDN BRI bonding calling. This allows users to connect up to
three NT1-terminated ISDN BRI line connections to VisuaLink. This
makes it possible to combine three signals from three separate BRI
lines into one contiguous data channel.