Cisco Systems PA-4R manual Token Ring Connection Equipment, Token Ring Distance Limitations

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Port Adapter Installation Prerequisites

Figure 1 Token Ring Network Physical Connections

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Token Ring Connection Equipment

You will need an 802.5 MAU or an MSAU to provide the interface between the 4R port adapter Token Ring interfaces and the external ring, and a Token Ring lobe cable between each 4R port adapter interface and the MAU or MSAU. Lobe cables connect each Token Ring station (4R port adapter interface) to the MAU or MSAU, and patch cables can connect adjacent MSAUs to form one large ring.

4R port adapter interfaces operate at either 4 or 16 Mbps. The default speed for all 4R port adapter interfaces is 4 Mbps, which you can change to 16 Mbps on any port using the ring-speedn configuration command, where n is the speed (4 or 16) in Mbps. The speed of each Token Ring port must match the speed of the ring to which it is connected. Before you enable the Token Ring interfaces, ensure that each is set for the correct speed, or it can bring down the ring.

Caution Each 4R port adapter interface must be configured for the same ring speed as the ring to which it is connected, either 4 or 16 Mbps. If the port is set for a different speed, it will cause the ring to beacon, which effectively brings the ring down and makes it inoperable.

Token Ring Distance Limitations

The maximum transmission distance is not defined for IEEE 802.5 (Token Ring) networks. Shielded twisted-pair (STP) cabling is most commonly used for rates of 4 and 16 Mbps. Twisted-pair cabling is more susceptible to interference than other types of cabling; therefore, the network length and repeater spacing should be planned accordingly.

PA-4R Half-Duplex Token Ring Port Adapter Installation and Configuration

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Contents Contents Port Adapter Installation Prerequisites Software and Hardware RequirementsList of Parts and Tools Safety GuidelinesChecking Hardware and Software Compatibility Safety Warnings Telephone Wiring Guidelines Electrical Equipment GuidelinesPreventing Electrostatic Discharge Damage Token Ring SpecificationsToken Ring Overview IBM Token Ring and Ieee 802.5 Comparison Token Ring Connection Equipment Token Ring Distance LimitationsWhat Is the 4R Port Adapter? Token Ring Speed ConsiderationsDram 4R Port Adapter LEDs Port adapter slot Blank port adapter4R Port Adapter Receptacles, Cables, and Pinouts 4R Port Adapter CablesVIP2 and the 4R Port Adapter 4R Port Adapter Receptacle PinoutInstalling or Replacing a Port Adapter on a VIP2 Location of Port Adapter Screw Partial Port Adapter View Aligning a Port Adapter in a Port Adapter Slot H3152 Attaching 4R Port Adapter Interface Cables Token Ring Interface Cable ConnectionsConfiguring the 4R Interfaces Using the Exec Command Interpreter At the Exec prompt for a router, enter the enable commandUsing the Setup Command Facility BracketsConfiguring Interfaces Using the configure Command Configuring interface parametersChange the default shutdown state and enable the interface Checking the Configuration Using show Commands to Verify the VIP2 StatusRouter# sh int tokenring 3/0/0 Using the ping Command Cisco 7200 Series and the 4R Port Adapter 4R port adapterRemoving a Port Adapter Replacing a Port Adapter Handling a Port AdapterPort adapter Handle Configuring the 4R Interfaces Cisco 7200 Series and the 4R Port Adapter Configuring Interfaces Routerconfig-if#ip address 1.1.1.10Using show Commands to Verify the New Interface Status Using show Commands to Display Interface Information Board revision A0 Serial number 2023868 Part number Router# ping 1.1.1.10 Return Type escape sequence to abort Related Documentation Obtaining Documentation, Obtaining Technical Assistance,Obtaining Documentation World Wide WebDocumentation CD-ROM Ordering DocumentationTechnical Assistance Center Obtaining Technical AssistanceCisco.com Cisco TAC Web Site Cisco TAC Escalation CenterOL-3589-01
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