Installation guide

Chapter 1 Overview of Cisco Interface Cards
Cisco 3700 Series Routers
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Cisco Interface Cards Installation Guide
OL-1919-12
A Cisco 3745 router includes four slots in which you can install network modules.
Each pair of slots can be combined to accommodate a double-width network
module. The slot numbers are as follows:
• 1 for interfaces in the lower-right network module slot
• 2 for interfaces in the lower-left network module slot
• 3 for interfaces in the upper-right network module slot
• 4 for interfaces in the upper-left network module slot
• 2 for interfaces in the lower double-width slot
• 4 for interfaces in the upper double-width slot
Port Numbering
Port numbers begin at 0 for each slot, and continue from right to left and (if
necessary) from bottom to top. Network modules and interface cards are
identified by interface type, slot number, a forward slash (/), and the port number;
for example, Fast Ethernet 0/0.
Figure 1-3 shows an example of interface numbering on a Cisco 3725 router with
the following configuration:
• A WAN interface card (WIC) in each WIC slot
• A 2-port T1 network module in slot 1 (containing the following ports: T1 1/0
and T1 1/1)
• A 36-port Ethernet switch network module in slot 2 (containing the following
ports: Fast Ethernet 2/0 through 2/35, and Gigabit Ethernet 2/0 and 2/1)
• Two built-in Ethernet 10/100 interfaces—Fast Ethernet 0/0 and Fast Ethernet
0/1