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NOTE: This is an unformatted excerpt from our online fire protection training library.

Central Station Fire Alarm Systems

In most cases today, the equipment uses some form of continuous multiplex transmission technology. Many central stations communicate with the subsidiary stations using high-speed, large-bandwidth data transmission equipment, such as a T-1 line.

When the communication path fails, there must be automatic switching to an alternate path between the subsidiary station and the central station. The use of the public switched phone network is allowed on an emergency basis, until technicians can restore the normal communications path. This connection has to be what is known as a "dial up, make good" connection through the phone network. This "dial up, make good" connection can't be the primary transmission path.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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