Network Module Slots Available on Cisco Access Routers

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.