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Table of Contents

The 25-Mbps Port Adapters

The 25-Mbps Port Adapters

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

This chapter includes the following sections:

Overview of the 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 supports any port adapter combination required, up to a maximum of eight 25-Mbps port adapters. Table 3-1 identifies the maximum number of 25-Mbps interface ports supported in each system.


Table 3-1: Maximum Interface Ports Supported by System Type
System Type Max. No. of 4-Port 25-Mbps
Interface Ports 		Max. No. of 12-Port 25-Mbps
Interface Ports

Catalyst 8510 MSR

32

96

Catalyst 5500

32

96

LightStream 1010

32

96

Note The 25-Mbps port adapter is not supported in the Catalyst 8540 MSR.

Figure 3-1 shows a 4-port 25-Mbps port adapter with a 96-pin Molex connector.


Figure 3-1: 4-Port 25-Mbps Port Adapter with a 96-Pin Molex Connector


Figure 3-2 shows a 12-port 25-Mbps port adapter with a 96-pin Molex connector.


Figure 3-2: 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, as shown in Figure 3-3.


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


Cabling the 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 For descriptions of ATM cabling requirements, see the "ATM Connection Equipment Requirements" section.

25-Mbps Port Adapter Connectors

Use the 96-pin Molex connector to connect the RJ-45 UTP to the end workstations. (See Figure 3-4.)

For UTP traffic, use the RJ-45 connector to connect the 25-Mbps port adapter to the workstations.

Note For a description of these connectors, see the "ATM Connection Equipment Requirements" section. (Figure 2-10 shows a 96-pin Molex connector. Figure 2-4 shows an RJ-45 connector.)

Figure 3-4: 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 3-4 and described in Table 3-2.


Table 3-2: 25-Mbps Port Adapter LED Descriptions
LED State Description

(receive)

Off
Flashing green

Flashing yellow
Steady yellow
Red

No receive line activity
Cells being received: blinks every five seconds and
pulse rate increases with data rate
Loopback
Alarm FERF1
Alarm (Line Code Error or LCD2)

1FERF = far-end receive failure
2LCD = loss of cell delineation


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Posted: Fri Nov 5 09:22:58 PST 1999
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