复旦大学：《计算机网络 Computer Networking》课程教学资源（PPT课件讲稿）Hands On：Cutting and Connectorizing UTP

Hands on: Cutting and Connectorizing UTP Chapter 3a Panos Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book

Hands On: Cutting and Connectorizing UTP Chapter 3a Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book

Recap: 4-Pair Unshielded Twisted Pair Cable with rJ-45 Connector our pairs(each pair is twisted) are Single Twisted Pair enclosed in a jacket Jacket 3a-2

3a-2 Recap: 4-Pair Unshielded Twisted Pair Cable with RJ-45 Connector Single Twisted Pair Jacket Four pairs (each pair is twisted) are enclosed in a jacket

Recap: 4-Pair Unshielded Twisted Pair Cable with RJ-45 Connector. Continued The cord terminates in an 8-pin RJ-45 connector, which plugs into an RJ-45 jack in the NIc hub, or switch Pin 1 on this side Unshielded (no metal shielding around the 4 pairs) RJ-45 RJ-45 Connector Jack 3a-3

3a-3 Recap: 4-Pair Unshielded Twisted Pair Cable with RJ-45 Connector, Continued The cord terminates in an 8-pin RJ-45 connector, which plugs into an RJ-45 jack in the NIC, hub, or switch. Pin 1 on this side RJ-45 Jack RJ-45 Connector Unshielded (no metal shielding around the 4 pairs)

Recap: 4-Pair Unshielded Twisted Pair cable with rj-45 Connector. Continued RJ-45 Connector Pen 4 Pairs Separated 3a-4

3a-4 Recap: 4-Pair Unshielded Twisted Pair Cable with RJ-45 Connector, Continued RJ-45 Connector 4 Pairs Separated Pen

)RJ-45 Plug in Wall Jack Has push-in prong connectors for 8 wires in back ao Front Back RJ-45 Jack 8 Wire connectors 3a-5

3a-5 RJ-45 Plug in Wall Jack • Has push-in prong connectors for 8 wires in back Front: RJ-45 Jack Back: 8 Wire Connectors

Solid-Wire Versus Stranded-Wire UTP Solid-Wire UTP Each of the eight wires is a solid wire surrounded by insulation Solid wires have low attenuation and so can reach 100 meters Easy to connectorize(add connectors to Brittle and easy to break if handled roughly. not good for runs through open office areas 3a-6

3a-6 Solid-Wire Versus Stranded-Wire UTP • Solid-Wire UTP – Each of the eight wires is a solid wire surrounded by insulation – Solid wires have low attenuation and so can reach 100 meters – Easy to connectorize (add connectors to) – Brittle and easy to break if handled roughly. Not good for runs through open office areas

Solid-wire versus stranded -wire Utp Continued Stranded-Wire UTP Each of the eight "wires"is really several thin strands of wire surrounded by insulation Flexible and rugged: ideal for running around an office area Higher attenuation than solid-wire UTP so can only be used in short runs-up to about 10 meters 3a-7

3a-7 Solid-Wire Versus Stranded-Wire UTP, Continued • Stranded-Wire UTP – Each of the eight “wires” is really several thin strands of wire surrounded by insulation – Flexible and rugged: ideal for running around an office area – Higher attenuation than solid-wire UTP so can only be used in short runs—up to about 10 meters

Patch Cords Versus Bulk Wire Patch cords Cut to popular lengths and connectorized at the factory Tested for quality Use stranded-wire UTP, which is sufficiently rugged for open offIce areas TIAEIA-568 specifies patch cords for the run from the wall jack to the desktop because it is rugged and flexible 3a-8

3a-8 Patch Cords Versus Bulk Wire • Patch Cords – Cut to popular lengths and connectorized at the factory – Tested for quality – Use stranded-wire UTP, which is sufficiently rugged for open office areas – TIA/EIA-568 specifies patch cords for the run from the wall jack to the desktop because it is rugged and flexible

Patch Cords versus Bulk wire Continued Bulk wire Comes in spools of 50 meters or more Can be cut to precise lengths needed to connect devices Solid-wire UTP for longer distance and to make connectorization easier Cut, connectorized, and tested by the user, by the organization or by a lan installer Focus of this chapter 3a-9

3a-9 Patch Cords Versus Bulk Wire, Continued • Bulk Wire – Comes in spools of 50 meters or more – Can be cut to precise lengths needed to connect devices – Solid-wire UTP for longer distance and to make connectorization easier – Cut, connectorized, and tested by the user, by the organization, or by a LAN installer – Focus of this chapter

Cutting UTP Now do it Cut a desired length of UTP Make it a little longer than you need Adding a connector can take a few inches If the connectorization doesnt test well, you will have to cut the end and install a new connector UTP cord should never be pulled tautly; it can beak if subjected to pulls. Should be slack after installation 3a-10

3a-10 Cutting UTP • Cut a desired length of UTP • Make it a little longer than you need – Adding a connector can take a few inches – If the connectorization doesn’t test well, you will have to cut the end and install a new connector – UTP cord should never be pulled tautly; it can beak if subjected to pulls. Should be slack after installation Now do it!