Installation guide

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Cisco Interface Cards Installation Guide
OL-1919-12
Chapter 1 Overview of Cisco Interface Cards
Cisco 3600 Series Routers
For the Cisco 3620 and Cisco 3640 routers shown in Figure 1-5 and Figure 1-6,
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.
Some modules have two small slots, labeled W0 and W1, for interface cards.
Figure 1-7 shows the W0 and W1 slots of the 2-Ethernet 2-card slot (2E 2-slot)
module. You can install interface cards into the small module slots, and serial
interface cards can be installed into either slot W0 or W1.
Figure 1-7 Interface Card Slots
Unit Numbering
Cisco 3600 series routers have unit numbers that identify the interfaces on the
modules and interface cards installed in the router. Unit numbers begin at 0 for
each interface type, and continue from right to left and (if necessary) from bottom
to top. Modules and interface cards are identified by interface type, slot number,
followed by a forward slash (/), and then the unit number; for example,
Ethernet 0/0.
Note In the Cisco 3660 router, the fixed Fast Ethernet ports are located in chassis slot 0
and are identified by interface type chassis slot/unit number; for example,
Fast Ethernet 0/0.
2E
2W
W1
STP
ETHERNET 0ETHERNET 1
AUI
EN
ACT LNK
WO
ACT
ILNK
Slot W1 Slot W0
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