The 25-Mbps Port Adapters

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

Catalyst 8510 MSR
Catalyst 5500
LightStream 1010

This chapter includes the following sections:

Overview of the 25-Mbps Port Adapters

This chapter describes the following 25-Mbps port adapters:

The 4-port 25-Mbps port adapter
The 12-port 25-Mbps port adapter

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.

Interfaces Supported

The ATM switch supports any port adapter combination required, up to a maximum of 8 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 Maximum Number of
Interface Ports for the 4-Port
25-Mbps Port Adapter Maximum Number of
Interface Ports for the 12-Port
25-Mbps Port Adapter

Catalyst 8510 MSR

32

96

Catalyst 5500

32

96

LightStream 1010

32

96

Table 3-1: **Maximum Interface Ports Supported by System Type**
System Type	Maximum Number of Interface Ports for the 4-Port 25-Mbps Port Adapter	Maximum Number of Interface Ports for the 12-Port 25-Mbps Port Adapter
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: The 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: The 12-Port 25-Mbps Port Adapter with a 96-Pin Molex Connector

ATM Connections Supported

The 25-Mbps port adapter ports provides UTP5 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 2-6 shows a 96-pin Molex connector. Figure 2-3 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, and they are described in Table 3-2 and shown in Figure 3-4 .

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

(receive)

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

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

Table of Contents

The 25-Mbps Port Adapters