About Tram-Net - GE Medical Systems Solar 9500 Service Manual

About Tram-net

3-14
Installation: Acquisition Interfaces
The three 9-pin connectors on the processing unit make a Tram-net
network available for the acquisition devices.
Tram-net is a small network that offers ample flexibility, a high rate of
communication, and relatively inexpensive cabling. Data is transmitted
at the rate of 921.6K bits per second. It uses a star topology, sometimes
referred to as a rooted tree topology. This means that the wiring of the
network can be pictured as a star or a series of stars. The center of each
star is called a hub, and at the points of the star are called nodes. There
are cables between the nodes and the hubs, but no cables exist between
nodes.
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Do not confuse the internal hub or node with the Tram-net hub
assembly used with other GE modular monitors. The hub described
in these paragraphs refers to the electronic distribution point of data.
Data is acquired at a node, and is transmitted through a hub to all the
other nodes. Each node has an address so data will be received by the
node with the correct destination address. It is impossible for a node to
communicate with another node without the data going through a hub
somewhere along its journey. The hub controls all of the data 'traffic' in
the system.
In a Tram-net system, the head hub is contained in the patient monitor,
but there will be intermediate hubs in the Tram-rac housing and Tram
module as well.
Solar 9500 Information Monitor
2001085-061
020A
Revision A