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. |
