C-1
Appendix C
Glossary
10BASE2
An IEEE Standard for Thin Coax Ethernet networks: 10 Mb/s transmission, baseband
signaling, 185 meters per coax segment. Also known as Thinlan, Thinnet, or Cheapernet.
10BASE-T
An IEEE Standard for unshielded twisted pair Ethernet networks: 10 Mb/s transmission,
baseband signaling, unshielded twisted pair cable. Maximum cable length is 100 meters.
100BASE-TX
An IEEE Standard for twisted pair Ethernet networks: 100 Mb/s transmission; baseband
signaling; two-pair, category 5 twisted pair cable. Maximum cable length is 100 meters.
1000BASE-T
An IEEE Standard for twisted pair Ethernet networks, also known as Gigabit Ethernet:
1,000 Mb/s transmission; baseband signaling; four-pair, category 5 twisted pair cable.
Maximum cable length is 100 meters.
ACR
Attenuation to crosstalk ratio. The difference between NEXT in dB and attenuation in dB.
Good cable performance corresponds to high ACR values (in negative dB), which results
when NEXT is much higher than attenuation.
Anomaly
A location on a network cable where the cable’s impedance changes abruptly.
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