Communications Specialties Pure Digital FIBERLINK 3800 Series Manuale d'uso - Pagina 10

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OPERATING POINTERS AND

OPTICAL FIBER:

GENERAL:

DATA CIRCUIT:

TROUBLESHOOTING

Versions of the Pure Digital Transmission System are

available to operate with most multimode (MM) and

single-mode (SM) optical fibers. Be certain that the

correct size fiber is being used for the particular trans-

mitter/receiver combination.

Also be certain that the attenuation and bandwidth of

the fiber optic cable being used is within the range of

the system's loss budget specifications.

The status of any of the LINK indicator LED should

provide the first clue as to the origin of any operation

failure. If this LED is off it usually means that the

fiber is broken or has too much attenuation.

Next, be certain that the input and output signal con-

nections are proper. Due to the number of positions,

it is possible that there may be wrong connections.

Finally, although multimode and single mode devices

may look the same, they will not operate properly to-

gether. Using the wrong device or fiber can easily add

more attenuation than specified, resulting in poor over-

all performance.

Even when installed exactly as directed, it is possible

that the data function may fail to operate properly

when using the Fiberlink units in either the RS-485

2-wire auto xmit/receive mode or the RS-485 4-wire