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This chapter describes the FDDI and Fast Ethernet cabling guidelines and several common Catalyst 2800 configurations using the Catalyst 2800 modules. The cabling guidelines and sample networks are divided according to the two groups of modules, FDDI and Fast Ethernet.
The following cabling guidelines apply to an FDDI network:
The FDDI modules can have one or two ports: an A port and a B port in a dual-attach configuration or an S port in a single-attach configuration. The valid port configurations for an FDDI module are described in Table 3-1.
Table 3-1 Valid FDDI Port Configurations
| Module Connection | Other Device | Description |
|---|---|---|
| A | B | Peer connection between FDDI Fiber DAS and another DAS device on trunk ring. |
| B | A | Peer connection between FDDI Fiber DAS and another DAS device on trunk ring. |
| S | M | Connection between FDDI Fiber SAS or UTP SAS and concentrator. |
| A | M | Connection between FDDI Fiber DAS and concentrator. Used for dual homing. |
| B | M | Connection between FDDI Fiber DAS and concentrator. Used for dual homing |
| S | S | Connection between FDDI Fiber SAS or UTP SAS and another SAS station. |
This section describes several common Catalyst 2800 network configurations:
Figure 3-1 shows multiple Catalyst 2800s connected to a trunk ring. Each Catalyst 2800 is configured with an FDDI Fiber DAS module and a 100BaseTX/1 module for a local server connection.
Figure 3-1 Catalyst 2800 Connected to a Trunk Ring via FDDI Fiber DAS
Figure 3-2 shows a Catalyst 2800 connected to a concentrator in a dual-homing configuration using a Fiber DAS module.
Figure 3-3 shows multiple Catalyst 2800s connected to a concentrator. Each Catalyst 2800 is configured with an FDDI Fiber SAS module and a 100BaseTX/1 module for a local server connection. This configuration also applies to a Catalyst 2800 connected to a server or router port.
Figure 3-3 Catalyst 2800 Connected to a Concentrator via FDDI Fiber SAS
Figure 3-4 shows a Catalyst 2800 connected to a server using a UTP SAS module. This configuration also applies to a Catalyst 2800 connected to a concentrator or router port.
Figure 3-4 Catalyst 2800 Connected to a Server or Router via FDDI UTP SAS
This section describes 100Base-T cabling guidelines and some common configurations for Catalyst 2800 modules. The following cabling guidelines apply to a 100Base-T network:
To determine your cable budget, use the following formula:
Table 3-2 lists the maximum cable length between two nodes in a 100Base-T network.
Table 3-2 Cabling Limits in a 100Base-T Network
| Number of Repeaters | Maximum Cable Length Between Two Nodes |
|---|---|
| 0 | 400 meters |
| 1 | 305 meters |
| 2 | 210 meters |
The maximum cable length between any two nodes in a one repeater 100Base-T network is 305 meters. Figure 3-5 illustrates this guideline. A Catalyst 2800 with a 100BaseFX/4 repeater module installed is connected to four other Catalyst 2800s via fiber. In this example, the total length of cable A plus cable B must be 305 meters or less.
Figure 3-5 100BaseT One Repeater Network
This section describes several common Catalyst 2800 network configurations:
Figure 3-6 shows a Catalyst 2800 connected to a high-performance client/server workgroup using the following:
The servers and workstations are configured with 100BaseT adapters.
Figure 3-6 High-Performance Client/Server Workgroup
Figure 3-7 shows a Catalyst 2800 connected to several 100BaseT servers via fiber using the following:
The servers in building 2 in this example are configured with fiber 100BaseT adapters.
Figure 3-7 Catalyst 2800 Connected to Servers via Fiber
Figure 3-8 shows multiple Catalyst 2800s connected via fiber in a high-rise building network environment using the following:
Figure 3-8 Catalyst 2800s Connected via Fiber in a High-Rise Building
Figure 3-9 shows multiple Catalyst 2800s connected via fiber in a campus network environment using the following:
Figure 3-9 Catalyst 2800s Connected via Fiber in a Campus Environment
Figure 3-10 shows two Catalyst 2800s with the CollisionFree option connected via fiber using two Catalyst 2800s with 100BaseFX/1 modules installed.
With fiber and full duplex operation, the cable distance between two Catalyst 2800s extends to two kilometers.
Figure 3-10 Two Catalyst 2800s Connected via a Fiber Full Duplex Link
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