Mission-Specific Routers
'Mission-specific' models contained less memory and less hardware functionality, and were tailored to support only a subset of protocols. A 'Mission-specific' model could be upgraded to full router capability by installing a full featured IOS image and (if necessary) adding memory. There routers were mainly intended to be frame relay access devices.
The software images installed on these devices intentionally crippled the hardware (for example on-board ethernet port on the 2501CF was disabled, and the 2503I disabled both on-board serial ports).
'Mission-specific' models included 2501CF, 2501LF, 2502CF, 2502LF, 2503I, 2504I, 2520CF, 2520LF, 2521CF, 2521LF, 2522CF, 2522LF, 2523CF and 2523LF.
The 'CF' in the model number stood for CFRAD software (Cisco Frame Relay Access Device), and the 'LF' stood for LAN FRAD (Local Area Network Frame Relay Access Device - i.e. Ethernet/Token ring to Frame Relay). 'I' referred to an ISDN access device.
Pricing (Circa 1995) - 2520CF US$1,595 to 2523LF US$3,995
Read more about this topic: Cisco 2500 Series