cabling 03 25

© 2000, Cisco Systems, Inc. 3-1

Chapter 3

Assembling and Cabling Cisco Devices

© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-2

Objectives

Upon completion of this chapter, you will be able to perform the following tasks:• Identify and connect necessary components

to enable connectivity between routers or switches• Identify and connect necessary components

to enable WAN connectivity over serial or ISDN BRI connections• Set up console connections between routers,

switches and a terminal


core_sw_a

ISDN Cloud Leased Line/Frame Relay

Cabling the Campus

LegendFastEthernet/EthernetISDNDedicated

Core_Server


Physical

Data Link(MAC layer)

LAN Physical Layer Implementations

• Physical layer implementations vary• Some implementations support multiple

physical mediaEt

hern

e t

100 b

aseT

X

10B

aseT

802.3

10B

ase5

10B

ase2

100 b

aseF

X

802.3 Specifications for 10MB Ethernet

802.3u Specifications for 100MB (Fast)

Ethernet

100b

aseT

4

10B

aseFDIX

Standard


Positioning Ethernet in the Campus

Access Layer

Distribution Layer

Core Layer

Ethernet 10BaseT Position

Fast Ethernet Position

Access Layer

Distribution Layer

Core Layer

Provides connectivty between the end user device and the access switch.

Not typically used at this layer.

Gives high-performance PC and workstations 100-Mbps access to the server.

Provides connectivity between access and distribution layers. Provides connectivity from the distribution to core layer. Provides connectivity from the server block to the core layer.

Provides inter-switch connectivity.Not typically used at this layer.


Comparing Ethernet Media Requirements

10Base5 100BaseTX10BaseT 100BaseFX

Media

Maximum Segment Length

Topology

Connector

50-ohm coax (thick)

500 meters

Bus

100 meters

Star Star Point-to-Point

EIA/TIA Cat3, 4, 5 UTP

2 pair

EIA/TIA Cat5 UTP2 pair

62.5/125 micron multi-

mode fiber

AUI ISO 8877 (RJ-45)

Duplex media-interface connector (MIC) ST

ISO 8877 (RJ-45)

400 meters100 meters


Differentiating between Connections

AUI connectors are DB15

ISO 8877 (RJ-45) connectors and jacks

are slightly larger than RJ-11 phone

connectors and jacks

Fiber Connector Port


UTP Device

The RJ-45 Connector

1

8

8 Pair 4 R4

1234567

Wire PairT is TipR is Ring

Pair 3 T2Pair 3 R2Pair 2 T3Pair 1 R1Pair 1 T1Pair 2 R3Pair 4 T4

Pin


UTP Implementation Straight-through

Wires on cable ends are in same order

Pin Label1 RD+2 RD-3 TD+4 NC5 NC6 TD-7 NC8 NC

Cable 10BaseT/100BaseTx Straight-through

Pin Label1 TD+2 TD-3 RD+4 NC5 NC6 RD-7 NC8 NC

Server/Router

8 1

wg

g bwo

wb

o brwbr

1

8

Straight-through Cable

81Hub/Switch

8 1

wg

g bwo

wb

o brwbr


UTP Implementation Crossover

Some wires on cable ends are crossed

8 1

wo

ob wg

wb

gbr wbr

Cable 10BaseT/100BaseT Crossover



Crossover Cable

18 1

8

8 1

wg

gwb

wo

b obr wbr

Hub/Switch Hub/Switch


UTP Implementation of Straight-through versus Crossover

Use a crossover cable when BOTH ports are designated with an x or neither port is designated with an x.

Use straight-through when only one port is designated with an X.

1x 2x 3x 4x

1x 2x 3x 4x 1x 2x 3x 4x


Cabling the Campus

• Determine the physical media used- 10MB or 100MBIndicates what type of CAT cable is required

• Locating interfaces on the chassis- determine if one or both ports have an X

Indicates if need crossover or straight-through cable

100 MbpsCat 5

Crossover

10 MbpsCat 3, 4, 5Crossover100 Mbps

Cat 5 Straight-through

10 MbpsCat 3, 4, 5

Straight-through10 Mbps

Cat 3, 4, 5Straight-through


Cabling the WAN

Core_Server

core_sw_a

ISDN Cloud

LegendFastEthernet/EthernetISDNDedicated

core_sw_b core_sw_b

ISL

Leased Line/Frame Relay


WAN Physical Layer Implementations

• Physical layer implementations vary• Cable specifications define speed of link

PPP

Fram

e R

elay

EIA/TIA-232EIA/TIA-449

X.21 V.24 V.35HSSI

ISDN BRI (with PPP)

RJ-45NOTE: Pinouts are different than RJ-45

used in campus

HD

LC


Differentiating Between WAN Serial Connectors

Router connections

Network connections at the CSU/DSUEIA/TIA-232 EIA/TIA-449 EIA-530V.35 X.21

CSU/DSU

End user device

DTE

DCE

Service provider


Data Terminal EquipmentEnd of the user’s deviceon the WAN link

Data Communications Equipment• End of the WAN provider’s

side of the communication facility• DCE is responsible for clocking

DCEDTE

ModemCSU/DSU

S S

SSS S

DTE DTEDCE DCE

Serial Implementation ofDTE versus DCE

DTE/DCE—The point where responsibility passes


Fixed Interfaces

2500 Router—rear view

Serial WAN ports can be fixed


Console


Ethernet AUIEthernet 10BaseT ISDN BRI S/T

Serial WAN ports can be modular


Modular Interfaces

Module

WAN Interface

Card


Cabling Routers for ISDN Connections

Determine if you need a BRI S/T or U InterfaceRouters have one or both types of ports

Note port Label


Cabling Routers for ISDN Connections (cont.)

!!!WARNING!!!Do not connect a cable into an ISDN port unless it is

from an ISDN switch or ISDN wall jack.If you connect a cable from any other device into the

BRI port, you will ruin the non-ISDN device.

Cisco Router

ISDN BRI port


• PCs require an RJ-45 to DB-9 or RJ-45 to DB-25 adapter• COM port settings are 9600 bps, 8 data bits, no parity,

1 stop bit, no flow control• This provides out-of-band console access• AUX switch port may be used for modem-connected

console

Setting up a Console Connection

Device with console


Visual Objective

core_ server

wg_sw_a

wg_sw_l

wg_pc_a

wg_pc_l

...LL/FR

wg_ro_a

wg_ro_l

e0/1(1x) e0/2 (2x)fa0/26 (Ax)

e0/2 (2x)

e0/1(1x)

e0

e0

s0

s0

bri0

bri0

fa0/26 (Ax)

fa0/1(1x)

fa0/12(12x)

fa0/23 (23x)fa0/24(24x) fa0/0

s1/0 - s2/3s3/0

consoleconsoleA/B

A/B consoleconsole

core_sw_a core_ro

...ISDN


Summary

After completing this chapter, you should be able to perform the following tasks: • Identify and connect necessary components to enable

connectivity between switches and routers• Identify and connect necessary components to enable

WAN connectivity between over serial or ISDN BRI connections

• Set up console connections on routers and switches


1. Discuss three standards on which Ethernet LAN implementations are based.

2. If you want to upgrade your switch to switch connectivity to 100BaseT, what category of cable do you need?

3. Does the following pinout scheme reflect a straight-through, rollover, or crossover cable?

4. What media can be used for each connector type?

Review Questions

A

B C

8 1

w0

o wb

wg

b g brwbr

81

wg

g wb

wo

b o brwbr

cabling 03 25

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