Arbiter Systems 1073A, Руководство по эксплуатации

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3.5 Fiber Optic Input (Option 01) 13
Channel Coupling Jumper Output Connector
A JMP3 J2
A JMP4 J3
A JMP5 J4
A JMP6 J5
B JMP10 J7
B JMP11 J8
B JMP12 J9
B JMP13 J10
C JMP17 J12
C JMP18 J13
C JMP19 J14
C JMP20 J15
Table 3.4: Output Jumper List
3.5 Fiber Optic Input (Option 01)
When Option 01 is installed, the Model 1073A also has a fiber-optic receiver which is connected in
parallel with channel-A input, DC-coupled optocoupler’s output. To use the fiber-optic receiver,
connect an optical signal meeting the requirements listed in Section 3.5.1, and follow the instructions
above for a DC-coupled input on channel A. All of the same features and restrictions apply, including
an upper frequency limit of 5 MHz and the bussing features.
With Option 01 installed, the normal DC-coupled input may still be used. The signals from the
optical input and the DC-coupled optocoupler are wire-OR’ed. To ensure proper operation, and to
protect the fiber input connector from damage, make sure that the protective cover supplied with
the optical receiver is installed whenever the optical receiver is not being used.
3.5.1 Optical Input Characteristics
The optical input has a type-ST connector compatible with 820 nm, multi-mode fiber, such as
50/125 or 62.5/125 um. An optical power input of -25.4 to -9.2 dBm is required to generate a logical
‘1,’ i.e. +5 volts at a (DC-coupled) output. An optical input of -40 dBm or less will guarantee
a logical ‘0.’ These characteristics are compatible with the multi-mode fiber outputs available for
the Arbiter Systems satellite-controlled clock products. The optical receiver is compatible with any
signal up to 5 MHz.