| 2501 | On Board | Ethernet | Interface-type Number | ethernet0 (e0) |
| On Board | Serial | Interface-type Number | serial0 (s0) & s1 | |
| 2514 | On Board | Ethernet | Interface-type Number | e0 & e1 |
| On Board | Serial | Interface-type Number | s0 & s1 | |
| 1721 | On Board | FastEthernet | Interface-type Number | fastethernet0 (fa0) |
| Slot 0 | WAC (WIN Interface Card) (Serial) | Interface-type Number | s0 & s1 | |
| 1760 | On Board | Fast Ethernet | Interface-types 0/port | fa0/0 |
| Slot 0 | WIC/VIC (Voice Interface Card) | Interface-type 0/port | s 0/0 & s0/1 v0/0 & v0/1 |
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| Slot 1 | WIC/VIC | Interface-type 1/port | s1/0 & s1/1 v1/0 & v1/1 |
|
| Slot 2 | VIC | Interface-type 2/port | v2/0 & v2/1 | |
| Slot 3 | VIC | Interface-type 3/port | v3/0 & v3/1 | |
| 2610 | On Board | Ethernet | Interface-type 0/port | e0/0 |
| Slot 0 | WIC (Serial) | Interface-type 0/port | s0/0 & s0/1 | |
| 2611 | On Board | Ethernet | Interface-type 0/port | e0/0 & e0/1 |
| Slot 0 | WIC (Serial) | Interface-type 0/port | s0/0 & s0/1 | |
| 2620 | On Board | FastEthernet | Interface-type 0/port | fa0/0 |
| Slot 0 | WIC (Serial) | Interface-type 0/port | s0/0 & s0/1 | |
| 2621 | On Board | FastEthernet | Interface-type 0/port | fa0/0 & fa 0/1 |
| Slot 0 | WIC (Serial) | Interface-type 0/port | s0/0 & s0/1 | |
| 1841 | On Board | FastEthernet | Interface-type 0/port | fa 0/0 & fa 0/1 |
| Slot 0 | High Speed WAN Interface Card (HWIC)/WIC/VWIC | Interface-type 0/slot/port | s0/0/0 & s0/0/1 | |
| 1841 | Slot 1 | HWIC/WIC/VWIC | Interface-type 0/slot/port | s0/1/0 & s0/1/1 |
| 2801 | On Board | FastEthernet | Interface-type 0/port | fa0/0 & fa 0/1 |
| Slot 0 | VIC/VWIC (voice only) | Interface-type 0/slot/port | voice0/0/0 voice0/0/3 | |
| Slot 1 | HWIC/WIC/VWIC | Interface-type 0/slot/port | 0/1/0 0/1/3 (single-wide HWIC) 0/1/0 0/1/7 (double-wide HWIC) | |
| Slot 2 | WIC/VIC/VWIC | Interface-type 0/slot/port | 0/2/0 - 0/2/3 | |
| Slot 3 | HWIC/WIC/VWIC | Interface-type 0/slot/port | 0/3/0 0/3/3 (single-wide HWIC) 0/3/0 - 0/3/7 (double-wide HWIC) | |
| 2811 | Built into Chassis Front | USB | Interface-type port | usb0 & usb 1 |
| Built into Chassis Rear | FastEthernet Gigabit Ethernet | Interface-type 0/port | fa0/0 & fa 0/1 gi0/0 & gi0/1 |
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| Slot 0 | HWIC/HWIC-D/WIC/VWIC/VIC | Interface-type 0/slot/port | s0/0/0 & s0/0/1 fa0/0/0 & 0/0/1 |
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| Slot 1 | HWIC/HWIC-D/WIC/VWIC/VIC | Interface-type 0/slot/port | s0/1/0 & s0/1/1 fa0/1/0 & 0/1/1 |
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| NME Slot | NM/NME | Interface-type 1/port | gi1/0 & gi1/1 s1/0 & s1/1 |
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