User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 36

5. Insert the optical transceiver into the socket until it locks into place.

6. Replace the optical transceiver dust cap if it was removed for installation.

7. Repeat procedure for each optical transceiver that requires installation.

8. Install a port cover (see Figure 19) over each unused optical transceiver socket.

4.9 Ports 1–6 Optical Connections

The optical interface between the DHU and each DEU or DRU is supported by six optical

ports. Each of the six optical ports provides a duplex LC-type optical transceiver which is

mounted on the DHU front panel. One side of the transceiver provides the optical fiber

connection for the forward path (downlink) signal. The other side of the transceiver provides

the optical fiber connection for the reverse path (uplink) signal. Use the following procedure

to install the forward and reverse path optical fibers and to connect them to the DHU:

Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser

radiation can seriously damage the retina of the eye. Do not look into the ends of any optical

fiber. Do not look directly into the optical transceiver of any digital unit or exposure to laser

radiation may result. An optical power meter should be used to verify active fibers. A

protective cap or hood MUST be immediately placed over any radiating transceiver or optical

fiber connector to avoid the potential of dangerous amounts of radiation exposure. This

practice also prevents dirt particles from entering the transceiver or connector.

1. Obtain the required lengths of single- or multi-mode fiber optic cable.

2. Route the fiber optic cable between the DHU and the DEU or DRU (if not already

routed) and cut to required length. Allow sufficient slack for dressing and organizing the

cables at each unit. Maintain a minimum bend radius of 2 inches (50 mm).

Note: The maximum path lengths for the optical fibers are as follows: 500 meters (1,641

feet) for 62.5 micron core multi-mode fiber, 750 meters (2,461 feet) for 50 micron core

multi-mode fiber, and 10 km (32,808 ft) for 9 micron core single-mode fiber.

3. Terminate each optical fiber with a field-installable LC type fiber optic connector as

shown in Figure 20. Follow the instructions provided by the connector manufacturer for

installing the connector.

4. Test each fiber for optical loss as described in Subsection 6.4.2 of this manual.

5. Designate one of the fibers as the forward path fiber and the other as the reverse path

fiber and label both ends of each fiber with the path designation.

6. Use the plastic joiner provided with the LC connectors to join the DHU Port 1 forward

and reverse path connectors together (see Figure 20). Make sure the forward path and

reverse path connectors are oriented as shown.

Note: When viewing any Port 1-6 optical transceiver from the front, the forward path port is

on the left and the reverse path port is on the right as shown in Figure 21. In addition, single-

mode transceivers are colored blue and multi-mode transceivers are colored black or beige.

Both single- and multi-mode transceivers may be mounted on the same DHU.