User's Manual

ADCP-75-130 • Issue 3C • August 2006

Page 53

6.4 Test Procedures

6.4.1 Optical Loopback Test Procedure

Dirty optical connectors, a faulty optical transceiver, a break in an optical fiber, or a fault in

an optical connector will interrupt communications between fiber-linked components. Use the

following procedure to determine if a fault exists with an optical port or with an optical fiber:

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. Put on the IR filtering safety glasses.

2. At the DHU or supporting DEU, place the PORT ON/OFF switch for the fiber port or

fiber to be tested in the OFF position (press O).

3. Disconnect the optical connectors for the fiber port to be tested and place a dust cap over

each connector.

4. Plug a loopback into the optical port to be tested as shown in Figure 25.

17277-A

OPTICAL LOOPBACK

CONNECTION DETAIL

PORT 1

OPTICAL

TRANSCEIVER

OPTICAL

LOOPBACK

Figure 25. DHU/DEU Loopback Test

5. At the DHU or supporting DEU, place the PORT ON/OFF switch in the ON position

(press I).