Specifications

2-16 Cisco Multiport Router Hardware Installation and Configuration Guide
Preparing to Connect to a Network
Ethernet Connections
The IEEE has established Ethernet as standard 802.3. The most common Ethernet
implementations are as follows:
• 10Base5 (AUI)—Ethernet on thick coaxial cable, also known as thick Ethernet. The
maximum segment distance is 1,640 feet (500 meters).
• 10Base2 (Thinnet)—Ethernet on thin coaxial cable, also known as thin Ethernet. The
maximum segment distance is 607 feet (185 meters).
• 10BaseT—Ethernet on unshielded twisted-pair (UTP) cable. The maximum segment
distance is 328 feet (100 meters). UTP cables look like the cables used for ordinary
telephones; however, UTP cables meet certain electrical standards that telephone cables
do not.
Your router includes an Ethernet AUI interface and a 10BaseT interface, which operates at
speeds up to 10 Mbps.
The cables and transceivers required to connect the router to an Ethernet network are not
included. For ordering information, see the section “Obtaining Service and Support” in the
“Overview of the Router” chapter.
Token Ring Connections
The two Token Ring ports are located on the rear panel of the Cisco 2521 and Cisco 2523
and are labeled TOKEN RING or UTP. The port labeled TOKEN RING uses a standard
9-pin Token Ring lobe cable and connects the multiport serial router directly to a media
attachment unit (MAU). The Token Ring port labeled UTP uses an RJ-45 Token Ring cable
and is connected through an adapter or directly to a MAU. Only one Token Ring port can
be used at a time.