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Optical Ethernet

Table of Contents:
Definition and Overview
1. Technology
2. History
3. Optical Ethernet Today
4. Recent Trends
5. Future Expectations
Self-Test
Glossary
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Self-Test
1. Which of these components of the original Ethernet specification has shown particular value?
a. Cat-5 unshielded twisted pairs
b. 10-megabit bandwidth
c. 1518-byte maximum packet size
d. 48-bit globally unique MAC addresses
e. half-duplex transmission
2. Which feature expanded the maximum span of an Ethernet beyond 3 km?
a. Cat-5 unshielded twisted pairs
b. bridge ports supporting full-duplex transmission
c. high-power lasers
d. 100-megabit (fast-Ethernet) transmission
3. When was Fast Ethernet over fiber optics first standardized?
a. in 1994, as part of the first Fast Ethernet standards
b. in 1990, as part of the 10BASE–T specification
c. in 2000, six years after Fast Ethernet over copper
d. it is still not a standard
4. Which feature of Gigabit Ethernet was not borrowed from fiber channel?
a. FC–0 fiber driver/receiver
b. FC–1 serializer/deserializer
c. 8B/10B encoding
d. 1.06-gigabit clocking rate
e. GBIC modules
5. All commercial Gigabit Ethernet implementations today are point-to-point, full-duplex links.
a. true
b. false
6. In current networking practices, optical Ethernet products are required to span distances greater than what?
a. 30 meters
b. 200 meters
c. 2 kilometers
d. 10 kilometers
e. 50 kilometers
7. Which feature is expected to accelerate the growth of optical Ethernet in the WAN?
a. fiber-channel compatibility
b. 10.000–Gbps speeds
c. SONET OC–192 speeds
d. improved optical fiber
8. A true all-optical Ethernet is expected in the near future.
a. true
b. false
9. Which of these are proposed 10-Gigabit Ethernet standards?
a. very-short-reach optics
b. coarse WDM—4 wavelengths at 2.5 gigabits each
c. serial 10.000 Gbps using 64B/66B encoding
d. serial SONET OC–192 compatible
e. all of the above
10. Which telecommunications services are possible using FTTB?
a. gigabit optical Ethernet
b. voice
c. video
d. circuit services
e. wavelength services
f. all of the above
11. The largest possible optical Ethernet can span what distance?
a. 10 kilometers
b. 100 kilometers
c. 1000 kilometers
d. global
12. Beyond 10 Gbps, the next logical step in Ethernet speeds is what?
a. 20 Gbps
b. 40 Gbps
c. 100 Gbps
d. 1 terabit per second
Glossary >>

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