User Manual

ADCP-75-136 • Issue 1 • November 2002
Page 33
© 2002, ADC Telecommunications, Inc.
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 18) over each unused optical transceiver socket.
4.8 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 19. 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 19). 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 20. 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.
FCC ID: F8I-DISSMRAA, Partial User Manual, 3 of 4