High Quality Content by WIKIPEDIA articles! The Cisco 2500 series of routers are a series of 19" rack mount access routers typically used to connect Ethernet or token ring networks via ISDN or leased serial connections (ie. Frame Relay, T1 etc). The routers are based on a Motorola 68EC030 CISC processor. This line of routers is no longer sold or supported by Cisco Systems. Token ring local area network (LAN) technology is a local area network protocol which resides at the data link layer (DLL) of the OSI model. It uses a special three-byte frame called a token that travels around the ring. Token ring frames travel completely around the loop. Token-possession grants the possessor permission to transmit on the medium.

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