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Chapter 1
Understanding Interface Numbering and Cisco IOS Software Basics
Figure 1-1
SE RIA
L
A/ S
CN/L P
3
Serial 1/3
Figure 1-2
A WIC in each WIC slot (containing interfaces Serial 0/0 and Serial 0/1 in physical slot W0,
•
interface Serial 0/2 in physical slot W1, and interface BRI 0/0 in physical slot W2)
•
A 2-port T1 network module in slot 1 (containing the following ports: T1 1/0 and T1 1/1)
Two built-in Ethernet 10/100 interfaces—FastEthernet 0/0 and FastEthernet 0/1
•
Figure 1-2
OL-1957-03
Example of 1RU Router
Serial 0/1
RXC
RXD
TXC
TXD
CN/L P
2
RXC
RXD
TXC
TXD
CN/L P
1
RXC
RXD
TXC
W 1
TXD
CN/L P
0
RXC
RXD
TXC
TXD
EN
LIN K
TO KE N
Serial 1/1
Serial 1/2
Serial 1/0
Ethernet 0/1
below shows a router of 2 RU height with:
Example of a 2RU Router
Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
Serial 0/0
C is co 26
W 0
12
10 0- 24
W 0
0V – 1A
50 /6 0 Hz
W 0
47 W
RI NG 0/0
AC T
LIN K
ET HE RN
ET 0/0
AC T
CO NS OL
E
AU X
Ethernet
Auxiliary
0/0
port
Console
port
Understanding Interface Numbering
1-3
NM -H DV
BA NK 4
BA
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