← Back to Network Devices

Cisco Systems 2521

Router

Port configuration diagram

Port configuration diagram

Basic Information

Manufacturer
Cisco Systems
Model
2521
Device Type
Router
Release Year
1995

Rack Mounting

Rackmountable
Yes
Rack Units
1U

Power

Power Supply
Internal

Fixed Interfaces

Data Interfaces

Qty Speed Protocol / Signaling Interface Notes
1x 128 kbps ISDN BRI (S/T) RJ-45 (8P8C)
—
2x 115.2 kbps TIA-232 (RS-232)TIA-449 (RS-449)TIA-530 (RS-530)V.35X.21 Proprietary
—
1x 16 Mbps Token Ring DB-9 (DE-9)RJ-45 (8P8C)
—
2x 2.048 Mbps TIA-232 (RS-232)TIA-449 (RS-449)TIA-530 (RS-530)V.35X.21 Proprietary
—

Management Interfaces

Qty Type Interface Pinout Notes
1x Console RJ-45 (8P8C) —
—
1x Remote RJ-45 (8P8C) —
—

Change History

Updated TheSerialPort 2026-04-08 15:33
  • Network Interface: Changed Protocol / signaling
  • Network Interface: Changed Notes
  • Network Interface: Changed Interfaces
  • Network Interface: Changed Protocol / signaling
  • Network Interface: Changed Notes
  • Deleted Network Interface: 1x 16Mbps
Updated ben 2026-02-23 02:27
  • Release year: 1994 → 1995
Updated ben 2026-02-23 02:24
  • Model: 2520 #1 → 2521
  • Status: Draft → Published
  • Submitted by: (empty) → TheSerialPort
  • Added Network Interface: 1x 128kbps ISDN (S/T) RJ-45 (8P8C)
  • Network Interface: Changed Speed value
  • Network Interface: Changed Protocol
  • Network Interface: Changed Interface
  • Network Interface: Changed Speed value
  • Network Interface: Changed Protocol
  • Added Photo: Photo of Router: Cisco Systems 2521

Submitted by TheSerialPort on