Specifications

1-6
Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
Chapter 1 Understanding Interface Numbering and Cisco IOS Software Basics
Understanding Interface Numbering
Figure 1-6 Cisco 3631 Router Rear View
For the Cisco 3660 router (see Figure 1-3), the slots are numbered as follows:
• Slot 0 contains fixed FastEthernet ports and is located at the top of the chassis.
• Slot 1 is at the bottom right (as viewed from the rear of the chassis), near the power supply.
• Slot 2 is at the bottom left.
• Slot 3 is at the right, above slot 1.
• Slot 4 is at the left, above slot 2
• Slot 5 is at the right, above slot 3.
• Slot 6 is at the left, above slot 4.
For the Cisco 3620 and Cisco 3640 routers shown in Figure 1-4 and Figure 1-5, the slots are numbered
as follows:
• Slot 0 is at the bottom right (as viewed from the rear of the chassis), near the power supply.
• Slot 1 is at the bottom left.
• Slot 2 is at the top right, above slot 0.
• Slot 3 is at the top left, above slot 1.
For the Cisco 3631 router shown in Figure 1-6, the slots are numbered as follows:
• Slot 0 for all built-in interfaces like the FastEthernet port at the bottom center near the Console/AUX
ports
• Slot 0 for all WAN interface card (WIC) interfaces
• Slot 1 for network module interfaces at the bottom left.
• Slot 2 for network module interfaces at the top left, above slot 1.
68501
S
E
E
M
A
N
U
A
L
B
E
F
O
R
E
I
N
S
T
A
L
L
A
T
I
O
N
AL
CD
LP
RD
TD
S
E
E
M
A
N
U
A
L
B
E
F
O
R
E
I
N
S
T
A
L
L
A
T
I
O
N
D
S
U
5
6
K
E
N
A
IC
-6
4
CONN 2
S
T
A
T
CO
NN 4
CONN 1
CO
NN 3
E
N
A
S
Y
N
C
ASYNC 8-15
ASYNC 0-7
15
1
4
1
3
12
11
10
9
8
7
6
5
4
3
2
1
0
ASYNC 24-31
ASYN
C 16-23
3
1
30
2
9
28
2
7
2
6
25
24
2
3
2
2
21
2
0
1
9
18
17
1
6
W1Slot 2 W0
Console/AUX
ports
FastEthernet 0/0
Slot 1