Passive OLANs

A new type of local area network—passive optical local area networks (OLANs)—is becoming widely accepted because it costs less than half as much as traditional LANs. How much do you know about passive OLANs?

1. Passive OLANs are based on fiber-to-the-_______ technology.

Correct Answer: Home

2. Passive OLANs use _______ to provide the connection from one central data port on an optical line terminal (OLT) to many users.

Correct Answer: Optical splitters

3. Passive OLANs transmit bidirectionally over a single fiber using wavelength division multiplexing with different wavelengths going downstream and upstream.

Correct Answer: True

4. The splitter in the passive OLAN essentially replaces the _______ in a structured cabling network.

Correct Answer: Ethernet switch

5. The typical passive OLAN supports up to _______ optical network terminals (ONTs) from one central port on the OLT.

Correct Answer: 32

6. In a passive OLAN, ONTs at the user site generally consist of a _______.

Correct Answer: 4-port gigabit ethernet switch for unshielded-twisted pair cable

7. All passive OLANs use _______ fiber for all cabling connections.

Correct Answer: Single-mode

8. Because of the short cables in enterprise LANs and the type of fiber used, most passive OLANs use APC fiber optic connectors to prevent problems caused by _______.

Correct Answer: Connector reflectance

9. The passive OLAN should be tested for insertion loss with a light source and power meter in either or both directions through the passive optical splitter.

Correct Answer: True

10. The most confusing part of testing passive OLANs is using an OTDR, because it only gives usable data when _______.

Correct Answer: Testing upstream from the user’s ONT to the OLT