JDSU NT850 User's Guide download pdf (Page 94)

Appendix A Glossary of Network Terms and Internet Protocols

Network Terms and Definitions

78 LanScaperPRO Network Tester User’s Guide

1-2, 3-6 pairs or the 4-5, 7-8 pairs in an RJ45 cable

depending on the location of the PSE. If the switch or

router at the end of an Ethernet cable run is the PSE, it is

termed an Endspan device, and it can safely use the 1-2,

3-6 pairs in the cable. Other PSE devices are designed to

be added to an existing wiring installation, and are

designed to be added Midspan and provide the power

using the 4-5, 7-8 pairs. Since in 10/100 MB Ethernet

installations, those pairs are not used by the Ethernet

devices, they can safely be used for power distribution.

The LanScaperPRO detects, tests, and reports any PSE

devices on the cable being tested which support either

IEEE or ILP protocols in both the Endspan and Midspan

configurations.

Straight-Through Cable

An Ethernet (CAT5/6) cable which connects all 4 pairs in

the cable straight through to the corresponding pairs in the

far end connector. This allows a NIC device to connect

directly to a hub device.

Switch

Similar to a hub, a switch is a multiple port Ethernet

connection device that allows for multiple Ethernet

devices to communicate between each other. Unlike a

hub, a switch has internal logic that determines which port

a specific MAC address is found on, and once it has deter-

mined that, it only forwards traffic destined for that

address to that port. This allows for fewer collisions on the

LAN by not re-transmitting every packet on every port.

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JDSU NT850 User's Guide Page 94