© 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
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-4
core_sw_a
ISDN Cloud Leased Line/Frame Relay
Cabling the Campus
LegendFastEthernet/EthernetISDNDedicated
Core_Server
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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
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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.
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-7
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
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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
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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
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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
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UTP Implementation Crossover
Some wires on cable ends are crossed
8 1
wo
ob wg
wb
gbr wbr
Cable 10BaseT/100BaseT Crossover
Pin Label1 RD+2 RD-3 TD+4 NC5 NC6 TD-7 NC8 NC
Pin Label1 RD+2 RD-3 TD+4 NC5 NC6 TD-7 NC8 NC
Crossover Cable
18 1
8
8 1
wg
gwb
wo
b obr wbr
Hub/Switch Hub/Switch
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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
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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
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-14
Cabling the WAN
Core_Server
core_sw_a
ISDN Cloud
LegendFastEthernet/EthernetISDNDedicated
core_sw_b core_sw_b
ISL
Leased Line/Frame Relay
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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
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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
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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
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Fixed Interfaces
2500 Router—rear view
Serial WAN ports can be fixed
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Console
1603 Router—rear view
Ethernet AUIEthernet 10BaseT ISDN BRI S/T
Serial WAN ports can be modular
3640 Router—rear view
Modular Interfaces
Module
WAN Interface
Card
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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
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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
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• 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
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-23
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
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-24
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
© 2000, Cisco Systems, Inc. www.cisco.com ICND v1.0a—3-25
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