C.13 Option 20A: Four Fiber Optic Outputs 141
C.13 Option 20A: Four Fiber Optic Outputs
Purpose
When installed into the standard Model 1093A/B/C, 1084A/B/C or 1088B, Option 20A provides
four individually selectable fiber-optic outputs with Type ST connectors and 820-nm transmitters
compatible with multimode fiber.
Specifications
Each fiber-optic output is jumper-configurable to each of the standard digital (CMOS) signal out-
puts. Analog signals, IRIG-B Modulated, and ±5 V Recorder are not selectable.
Option 20A provides an optical power output of -15 dBm minimum (-12 dBm typical) into 62.5/125-
µm fiber.
The optical signal is ON whenever the selected logic signal is HI. Transmitter bandwidth is com-
patible with all available logic signals.
Option 20A may be installed in Slot A of Model 1084A/B/C, in either Slot A or B of the standard
Model 1088A/B clock and in Slot A of Model 1093A/B/C clock.
Output Enable (JMP1)
This jumper is used at the factory for setting the output enable for the optical transmitters. For
normal operation, set jumper to position “A”. With two clocks containing Option 18 and configured
for redundant operation, this jumper may be set to position “B”, allowing the optical outputs to
be externally paralleled and driven by the on-line clock. Normally, this jumper will be configured
as required when delivered from the factory.
Output Jumper Enable (JMP2 – JMP5)
The standard digital (CMOS) output signals can be selected for output via one of the fiber-optic
output transmitters by setting jumpers JMP2 through JMP5 on the Fiber-Optic Option Board as
illustrated in Figure C.14.
The following tables provide a list of jumper to corresponding output transmitter and a list digital
signals available for configuration to a fiber-optic output connector. The same signals are available
via each jumper (JMP2 - JMP5) and corresponding setting.
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