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Appendix A Glossary of Network Terms and Internet Protocols

Network Terms and Definitions

74 LanScaperPRO Network Tester User’s Guide

Network Terms and Definitions

10 Base-T

The earliest definition of Ethernet was for 10 Million Bits

per second, 10 Mbps. The Ethernet specification defined

several different cabling schemes, including CAT5 (4-

pairs of wire) and Coax wiring. The 10 in 10 Base-T

defines 10 Mbps and the Base-T defines CAT5 cabling. 10

Base-2 defines 10 Mbps over coax.

100 Base-Tx

A newer Ethernet specification that defines 100 Mbps

data rate as an upgrade for higher network bandwidth.

Several different cable schemes are defined for 100

Mbps. The 100 in 100 Base-Tx defines the data rate as

100 Million Bits per second. The Base-Tx defines the

cable scheme as 2-pairs of wires in a CAT5 cable.

1000 Base-T

The newest common Ethernet communication protocol,

1000 Base-T employs full duplex baseband transmission

over four pairs of Category 5 balanced cabling. The

aggregate data rate of 1000 Mb/s is achieved by transmis-

sion at a data rate of 250 Mb/s over each wire pair. The

use of hybrids and cancellers enables full duplex trans-

mission by allowing symbols to be transmitted and

received on the same wire pairs at the same time. Base-

band signaling with a modulation rate of 125 MBd is used

on each of the wire pairs. Note that the LanScaperPRO

active network modes work in 10 Base-T or 100 Base-Tx

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JDSU NT850 Betriebsanweisung Seite 90