25-Mbps Port Adapters

This chapter describes the 25-Mbps port adapters that are supported in the following ATM systems:

• Catalyst 8510 MSR
  
  
• LightStream 1010
  
  
• Catalyst 5500
  
  

This chapter includes the following sections:

• About 25-Mbps Port Adapters
  
  
• Cabling 25-Mbps Port Adapters
  
  

About 25-Mbps Port Adapters

This section describes the 4-port and 12-port 25-Mbps port adapters.

Each port on the 25-Mbps port adapter is compliant with the ATM Forum PHY standard for 25.6 Mbps over twisted-pair cable and is ideal for workgroup links. The 25-Mbps port adapters have a 96-pin Molex connector and either a multileg 4 RJ-45 cable assembly or a 12 RJ-45 cable assembly.

Interface Ports Supported

The ATM switch router supports any port adapter combination required, up to a maximum of eight 25-Mbps port adapters. Table 4-1 identifies the maximum number of 25-Mbps interface ports supported in each system.

Figure 4-1 shows a four-port 25-Mbps port adapter with a 96-pin Molex connector.

Figure 4-1: Four-Port 25-Mbps Port Adapter with a 96-Pin Molex Connector

Figure 4-2 shows a 12-port 25-Mbps port adapter with a 96-pin Molex connector.

Figure 4-2: 12-Port 25-Mbps Port Adapter with a 96-Pin Molex Connector

ATM Connections Supported

The 25-Mbps port adapter provides UTP-5 interface connections from the desktop to the wiring closet. (See Figure 4-3.)

Figure 4-3: 25-Mbps Port Adapter ATM Desktop to Wiring Closet Connections

Cabling 25-Mbps Port Adapters

This section describes supported cabling configurations for the 25-Mbps ATM port adapters.

Note   All ATM interfaces are full duplex. You must use the appropriate ATM interface cable to connect the ATM UTP port adapter interface with an external ATM network.

25-Mbps Port Adapter Supported Interfaces

The 25-Mbps port adapters provide an interface to ATM switching fabrics for transmitting and receiving data at up to 25 Mbps bidirectionally over the interface ports on the port adapter.

Note   See Table B-1 for cabling requirements for 25-Mbps port adapters.

25-Mbps Port Adapter Connectors

Use the 96-pin Molex connector to connect the RJ-45 UTP to the end workstations. (See Figure 4-4.) For UTP traffic, use the RJ-45 connector to connect the 25-Mbps port adapter to the workstations. See "Connectors and Connector Pinouts," for more connector information.

Figure 4-4: 25-Mbps Port Adapter UTP Connections and LEDs

25-Mbps Port Adapter LEDs

The LEDs provide status information for the individual 25-Mbps interface connections. They are shown in Figure 4-4 and described in Table 4-2.