| | Cisco 2520 Router Specifications |
| Processor Speed (type) | 20 MHz (68030) |
| Flash Memory | 8-MB dual Flash bank option (default) 16 MB (max) |
| DRAM Memory | 4 MB, upgrades to 8 or 16 MB |
| Power Supply | AC, with optional DC or redundant power supply (RPS) |
| Fixed LAN Ports (connections) | 1-port Ethernet |
| Fixed WAN Ports (connections) | 2-port high-speed sync serial 1-port ISDN BRI (S/T) 2-port low-speed sync/async serial |
| Slots | None |
| Dimensions (HxWxD) | 1.75 x 17.5 x 10.56 |
| Service Category | 4 |
| | Cisco 2521 Router Specifications |
| Processor Speed (type) | 20 MHz (68030) |
| Flash Memory | 8-MB dual Flash bank option (default) 16 MB (max) |
| DRAM Memory | 4 MB, upgrades to 8 or 16 MB |
| Power Supply | AC, with optional DC or redundant power supply (RPS) |
| Fixed LAN Ports (connections) | 1-port Token Ring |
| Fixed WAN Ports (connections) | 2-port high-speed sync serial 1-port ISDN BRI (S/T) 2-port low-speed sync/async serial |
| Slots | None |
| Dimensions (HxWxD) | 1.75 x 17.5 x 10.56 |
| Service Category | 4 |
| | Cisco 2522 Router Specifications |
| Processor Speed (type) | 20 MHz (68030) |
| Flash Memory | 8-MB dual Flash bank option (default) 16 MB (max) |
| DRAM Memory | 4 MB, upgrades to 8 or 16 MB |
| Power Supply | AC, with optional DC or redundant power supply (RPS) |
| Fixed LAN Ports (connections) | 1-port Ethernet |
| Fixed WAN Ports (connections) | 2-port sync serial 1-port ISDN BRI (S/T) 8-port sync/async serial |
| Slots | None |
| Dimensions (HxWxD) | 1.75 x 17.5 x 10.56 |
| Service Category | 4 |
| | Cisco 2523 Router Specifications |
| Processor Speed (type) | 20 MHz (68030) |
| Flash Memory | 8-MB dual Flash bank option (default) 16 MB (max) |
| DRAM Memory | 4 MB, upgrades to 8 or 16 MB |
| Power Supply | AC, with optional DC or redundant power supply (RPS) |
| Fixed LAN Ports (connections) | 1-port Token Ring |
| Fixed WAN Ports (connections) | 2-port sync serial 1-port ISDN BRI (S/T) 8-port sync/async serial |
| Slots | None |
| Dimensions (HxWxD) | 1.75 x 17.5 x 10.56 |
| Service Category | 5 |
| | Cisco 2524 Router Specifications |
| Processor Speed (type) | 20 MHz (68030) |
| Flash Memory | 8-MB dual Flash bank option (default) 16 MB (max) |
| DRAM Memory | 4 MB, upgrades to 8 or 16 MB |
| Power Supply | AC, with optional DC or redundant power supply (RPS) |
| Fixed LAN Ports (connections) | 1-port Ethernet |
| Fixed WAN Ports (connections) | None |
| LAN Modules | None |
| WAN Modules | 1-port ISDN BRI (S/T) or 1-port ISDN BRI (U) Plus any two of the following: 1-port 2-wire Switched 56 DSU/CSU 1-port 4-wire 56K/64K DSU/CSU 1-port fractional/full T1 DSU/CSU 1-port sync serial (5-in-1 cable adapter) |
| Dimensions (HxWxD) | 1.75 x 17.5 x 10.56 |
| Service Category | 5 |
| | Cisco 2525 Router Specifications |
| Processor Speed (type) | 20 MHz (68030) |
| Flash Memory | 8-MB dual Flash bank option (default) 16 MB (max) |
| DRAM Memory | 4 MB, upgrades to 8 or 16 MB |
| Power Supply | AC, with optional DC or redundant power supply (RPS) |
| Fixed LAN Ports (connections) | 1-port Token Ring |
| Fixed WAN Ports (connections) | None |
| LAN Modules | None |
| WAN Modules | 1-port ISDN BRI (S/T) or 1-port ISDN BRI (U) Plus any two of the following: 1-port 2-wire Switched 56 DSU/CSU 1-port 4-wire 56K/64K DSU/CSU 1-port fractional/full T1 DSU/CSU 1-port sync serial (5-in-1 cable adapter) |
| Dimensions (HxWxD) | 1.75 x 17.5 x 10.56 |
| Service Category | 5 |