Burst Electronics MCG-3 - Manual (Page 16)

15 MCG-3 Color Micro Character Generator
The RJ11 cabling should be a direct connection from one MCG-3 unit
to the next. Do not use “Y” connectors or try to double up units. Also
the computer MUST be first in line on the network.
If the layout of a building is such that the computer should be in the
middle of the cabling, you might want to split the network between two
COM ports on the computer. See Figure Three.
Video Cabling
Video cabling is set up a bit different than the RJ11 cables. If multiple
MCG-3s will be using the same video source, then a video DA, such as
the Burst Model VDA-4 or VDA-8, must be used between the video
source and the MCG-3s. The MCG-3
VIDEO-OUT connecter is
connected to a video monitor. The monitor should be terminated in 75
ohms.
If the MCG-3 units will use separate video sources, then connect each
video source to its MCG-3 and the
VIDEO-OUT of the MCG-3 to its
video monitor.