Harmonic MAXLink HOA 7100 Series, Product Manual

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Connecting the Alarm Relay
HOA 7100 MAXLink Optical Amplifier Product Manual Rev C (4/05) 3–9
5. Verify that the HOA 7100 optical connector has not been exposed to any
contamination. If you suspect that the connector may have been exposed
to contamination (for example, by a dirty fiber cable connector), follow the
cleaning procedure outlined in Section
6.1.2 Cleaning MAXLink Amplifier
Optical Connectors on page 6-2.
NOTE: Any contamination of either the fiber cable or HOA 7100 receiver
connector can significantly degrade optical link performance. This
degradation will most likely manifest itself as poor signal-to-noise
(SNR) performance.
6. Note the key characteristics of the mating connectors and align them
accordingly. Gently insert the fiber cable connector into that of the
HOA 7100 until the connector clicks into place.
7. Move the fibers into the groove in the edge of the fiber tray, as shown in
Figure 3-2 on page 3-3.
8. Close the fiber tray.
9. Screw the locking screw to secure the fiber tray.
NOTE:
The amplifier ships with the lasers turned off. The Laser Off switch
on the rear panel is in the Off position.
3.9 Connecting the Alarm Relay
The HOA 7100 has a 5-pin alarm relay that provides the amplifier with
redundant switching capability. The alarm relay is located on the rear panel,
as shown in Section
3.4 Rear Panel Diagrams on page 3-3.
Table 3-1 shows the pin definitions.
When operating normally with no alarm present, Pin 2 and Pin 3 make
electrical contact, while Pin 1 is left open. When an alarm occurs, electrical
contact is made between Pin 1 and Pin 3, while Pin 2 is left open. This remains
until the alarm condition is removed.
Table 3-1: Alarm Relay Pins
Pin Label Function
Pin 1 NO Normally open
Pin 2 NC Normally closed
Pin 3 COM Common
Pin 4 GND Ground
Pin 5 +24 +24 V source for A/B switch