1-5
Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 1 Overview of Cisco Network Modules for Cisco Access Routers
Cisco Access Routers and Cisco Network Modules
Table 1-1
Network Module Slots Available on Cisco Access Routers
Cisco Router
Number
of Slots
Slot Type
Slot
Numbering
Installation Notes and Limitations
Cisco 2600 series
1
Single-wide
Slot 1
Does not support extension modules.
Cisco 2811 routers
1
Single-wide
Slot 1
Does not support extension modules.
Cisco 2821 routers
1
Single-wide
Extended
single-wide
Slot 1
Extension modules are not supported in standard network
module slots on this platform.
1
Extension
module
Slot 2
Extension module slots do not support other single-wide
network modules.
Cisco 2851 routers
1
Single-wide
Extended
single-wide
Double-wide
Extended
double-wide
Slot 1
Extension modules are not supported in standard network
module slots on this platform.
1
Extension
module
Slot 2
Extension module slots do not support other single-wide
network modules.
Cisco 3620 routers
2
Single-wide
Slot 0–slot 1
Does not support extension modules.
Cisco 3640 routers
4
Single-wide
Slot 0–slot 3
Does not support extension modules.
Cisco 3660 routers
6
Single-wide
Double-wide
Slot 1–slot 6
(see
Figure 1-5
)
Slot 0 refers to the board carrying fixed interfaces at the top
of the chassis.
Cisco 3725 routers
2
Single-wide
Slot 1–slot 2
Slot 2 accommodates double-wide network modules.
Tip
To install double-wide network modules, remove
the slot divider. (See the
“Removing Slot Dividers”
section on page 2-12
.)
Cisco 3745 routers
4
Single-wide
Slot 1–slot 4
Does not support extension modules.
2
Double-wide
Slot 2, slot 4
Removing the slot divider changes slot numbering as
follows:
•
Slot 1 and slot 2 become slot 2
•
Slot 3 and slot 4 become slot 4
Tip
To install double-wide network modules, remove
the slot divider. (See the
“Removing Slot Dividers”
section on page 2-12
.)