C.10 Option 20A: Four Fiber Optic Outputs 109
C.10 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
compatible with all available logic signals.
Option 20A may be installed in Auxiliary Slot of Model 1084A/B/C, in either Slot A or B of
the standard Model 1088A/B clock and in Auxiliarry Slot of Model 1093A/B/C clock.
Output Enable (JMP1) – Model 1088B Only
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
described in Table C.4 and illustrated in Figure C.7.
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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