Matrix boxes can come in two configurations.
The first is a closed chassis – where the number and type of connections are set and enclosed in shell. Products in this way insure a quality of operation for a specific duty and reduce intrusion of dust and any prying hands.
The second is the card cage model. This is where installers can add cards with the appropriate configuration of connectors and processing as needed for the job. Card cages tend to be a bit more expensive initially but the ability to add or replace cards as needed saves purchasing an entirely new unit or units.
Receiver Boxes
When the signal finally arrives at the destination monitor, or in electrical terms the sink, it must be converted from the compressed signal (if compressed) and signal type. Most video monitors do not come with a CAT 5 input as the number of standards is too overreaching to accommodate them all.
Receiver boxes are generally mounted in an electrical wall mount box just behind the video monitor, or more frequently attached to the rear of the unit. The twisted pair cable comes in one side and is processed to be broken out, error corrected and amplified as needed to the signal format required.
The sink end boxes insure that the signal received is optimal and reduces the need for intermediary booster boxes or signal amplifiers. This simple but effective technique helps ensure reliability and reduces cost of the system overall.
The essential concepts of media distribution systems are straightforward enough to grasp. Knowing what goes into designing and installing such a system requires a bit more digging. You are encouraged to read the technical documentation of the products from companies large and small, using this article as a base reference.
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