8
Fiber Optic Port.
The fiber optic connectors are of ST type.
The quality of the signal very much depends on the attenuation of the fiber
optic cable and splices.
For example the optical jitter is due to optical attenuation and depends on quality
and length of fiber used. Optical jitter is 0ps for 1m and typically <100ps for 1km.
It is therefore essential to keep the attenuation low. Patch cables and splices should
be kept as few as possible. Connectors shall be kept clean. Use a dry clean cotton
cloth, or similar, for polishing . If alcohol or any other solution is used for
cleaning, always polish with a dry cloth, to make sure that there is no residue left.
If a small amount of jitter can be accepted the AGC can control up to 8dB in
link attenuation, which equals approximately 2km fiber.
Two or more DA-36 can be cascaded to extend link length.
Make sure that the source fiber optic transmitter, marked Tx, is connected to
the remote units fiber optic receiver, marked Rx.
Functional earth/ground.
Connect to the functional ground screw if DA-36 chassis needs to be referenced
to ground.
This connection must be low impedance also at RF-frequencies.
BNC-ports
All BNC-ports are referenced to DA-36 chassis at delivery. They can
individually be configured to be isolated.
This is done by:
Functional ground
