User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 21

15988-A

Figure 10. AC/DC Power Converter

3.4 Optical Options and Requirements

Each DHU and its associated DEU’s and DRU’s are connected over a pair of optical fibers.

One fiber transports the forward path optical signal and the other fiber transports the reverse

path optical signal. Either 62.5 or 50 micron core multi-mode optical fiber; or 9 micron core

single-mode optical fiber may be used for the optical transport connection. With 62.5 micron

core fiber, the optical path may be up to 500 meters in length. With 50 micron core fiber, the

optical path may be up to 750 meters in length. With 9 micron core cable, the optical path may

be up to 10 kilometers in length. Single- and multi-mode fibers may be used in the same

system. A diagram of the optical connections is shown in Figure 11.

Whenever possible, use conduit or a guideway such as the FiberGuide system to route the optical

fibers between the DHU, the DEU’s, and the DRU’s. Avoid routing optical fibers through ladder

type cable racks or troughs that do not provide sufficient support to limit bending or prevent

accidental damage. Tie-wrapping is not recommended as a means of securing fiber optic cables.

Provide sufficient slack at each unit for connecting each fiber to the required port. Fibers may be

pre-terminated or terminated on-site using field-installable LC type connectors.