SIGMA MRX Series - Manual (Page 7)

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To ensure that the SCI has power at all times, the control module is connected to every power
module output. This guarantees that if any functional power supply module is installed, the SCI will have
power supplied to it. In addition, as long as there is more than one operating power supply in the power
frame, the SCI has redundant power capability.
CONTROL BUS WIRING
The data bus connection is provided on the rear of each power frame at the SCI interface panel.
Ribbon cables with 15 Pin D-type connectors are used as Bus connectors. These Bus connectors are used
to transmit the control data from the SCI to all system frames. All systems will be provided with enough bus
cable assemblies to meet the requirements of the system plus an expansion connector. Frame placement
within the racks will determine the required length of the bus cable. If custom length cables are required for
a specific application, Sigma Electronics Inc can accommodate special cable requirements.
POWER MODULE
All power is supplied to the audio and video frames from the power frame through the supplied DC
power cables. Although all power modules are identical, some positions within the frame are dedicated to
supply power to digital audio or video frames and other positions are to supply analog frames. For
applications where redundancy is required, each power frame can hold two digital and two analog assigned
supplies.
After the power supply modules are plugged into the power frame’s slots, install the power cables
into the rear of each supply and then connect to the rear of the appropriate frame, analog or digital. Analog
power cables are terminated with 4-pin connectors and digital power cables are terminated with 6-pin
connectors. Ensure that an analog power supply is used to supply an analog frame and a digital power
supply is used to supply a digital frame.
Additional DC input power connectors are provided on each analog and digital frame. Redundant
analog or digital power supplies may be mounted in the power frame and connected to the audio or video
frames via this connector. The redundant connector on the rear of the analog frame is labeled DC2-I. The
redundant connector on the rear of the digital frame is labeled DC 2.
*NOTE: If one analog video frame and two analog audio frames are used, connect the power supply
cables as follows: Connect one 4-pin power supply cable from the power supply frame to the video frame
connector DC1-I. Connect one 4-pin power supply cable from the power supply frame to the audio frame
connector DC1-I. Connect one 4-pin power supply cable from the video frame connector DC1-O to the 2
nd
audio frame connector DC1-I.