Specifications

44 Multivision® Pro Installation and Operation Manual
MULTIPLEXED VIDEO
TRANSMISSION
Two multiplexers can be employed to transmit video from
multiple cameras over a single video communication link. The
link may be coaxial cable, a microwave channel, or any other
medium that supports real-time video. Where two
communications links are available, simultaneous two-way
video communication is possible. Multiplexed video
transmission requires that one multiplexer be installed at each
location. See Figure 3 — One-Way Multiplexed Video
Transmission, for details.
A multiplexed video link allows users at one or both ends to
display local or remote cameras. Multiplexer operation is
normal except that you press function+tape to display the
remote cameras.
One-Way Video Transmission
One-way multiplexed video transmission requires two
multiplexers and one video quality communication link. The
link joins the vcr out connector at Site A to the vcr in connector
at Site B. Both Site A and Site B can view the cameras located
at Site A. Site B can view either local cameras (press live) or
the cameras located at Site A (press function+tape).
Two-Way Video Transmission
Two-way multiplexed video transmission requires two
multiplexers and two video quality communication links. The
communication links cross connect the multiplexer VCR
connectors at these sites: vcr out at Site A connects to vcr in
at Site B and vice versa. Both sites can view either local
cameras (press live) or the cameras located at the other site
(press function+ tape).
To establish a multiplexed video transmission link:
1. Connect two multiplexer units as described above.
2. Set VCR RECORD TIME on both multiplexer units to 001
HRS for NTSC/EIA units or 002 HRS for PAL/CCIR.
3. Press function+tape on each multiplexer. The multiplexer
enters the video transmission mode and displays all
remote cameras.
If you get a MISSING TAPE INPUT message, check the
connections and make sure that vcr in is connected to vcr out
on the other unit. Once the link is established, press the live
button to view local cameras, or press function+tape to view
remote cameras.