Communications Specialties FIBERLINK XRD-8050 Gebruikershandleiding - Pagina 5

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Theory of Operation

The FIBERLINK XRD-8050 is user-configurable to one of two modes, MASTER

or LOCAL, and the block diagram below shows the signal flow in either of these

configurations. As will be noted from the diagram, the unit consists of two

optical transmitters and two optical receivers contained within the same housing.

Depending on the setting of an internal MASTER/LOCAL switch, the intercon-

nections between the transmitters and receivers are varied to properly input,

output and/or repeat the data signals as required.

In addition, an anti-streaming circuit is provided to monitor the RTS port. If any

traffic signal controller connected to the XRD-8050 reverts to a streaming

condition, the pre-set time-out of the anti-streaming circuit will be exceeded and

all further data from the faulty controller will be blocked thereby preventing

system lock-up.

A rechargeable internal battery is provided in the stand-alone version of the

XRD-8050. In typical traffic signal network communications, this battery can

provide up to 12 hours of operation during the loss of prime power.

Functional Block Diagram of XRD-8050 and XRD-8050/RK