Network Module Slots Available on Cisco Access Routers

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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 / Extendet duble-wite 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 3600 2 Single-wide Slot 0-slot 1 Does not support extension modules.
Cisco 3640 4 Single-wide Slot 0-slot 3 Does not support extension modules.
Cisco 3660 6 Single-wide / Double-wide Slot 1-slot 6 Slot 0 refers to the board carrying fixed interfaces at the top of the chassis.
Cisco 3725 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.
Cisco 3745 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.
Cisco 3825 routers 3 Single-wide / Extended single-wide / Extension voice Slot 1-slot 3 To install double-wide network modules, remove the slot divider. Only one extension module can be installed per chassis.
1 Double-wide / Extended double-wide Slot 2 To install double-wide network modules, remove the slot divider. Only one NM-36ESW network module bcan be installed per chassis.
Cisco 3845 routers 4 Single-wide /Extended single-wide / Extension voice Slot 1-slot 4 Only two extension modules can be installed per chassis.
2 Double-wide / Extended double-wide Slot 1, slot 3 Removing the slot divider changes slot numbering as follows: • Slot 1 and slot 2 becomes slot 1 • Slot 3 and slot 4 becomes slot 3 Tip To install double-wide or extended double-wide network modules, remove the slot divider. Only two NM-36ESW network modules can be installed per chassis.
Cisco MWR 1941-DC routers 1 Single-wide Slot 1 Cisco MWR 1941-DC routers support single-wide network modules only.