Overview of ATM Port Adapters and Interface Modules

This chapter briefly describes ATM port adapters and interface modules, and includes the following sections:

Supported Port Adapters and Interface Modules

ATM port adapters and interface modules described in this publication are supported by the following systems:

Catalyst 8540 multiservice ATM switch router (MSR)
Catalyst 8510 MSR
Catalyst 5500
LightStream 1010

The matrix in Table 1-1 shows system support for each ATM port adapter and interface module.

Table 1-1: System Support for ATM Port Adapters and Interface Modules
Port Adapters and
Interface Modules Catalyst 8540 MSR Catalyst 8510 MSR Catalyst 5500 LightStream 1010

25-Mbps
Port Adapter

x

x

x

155-Mbps
Port Adapter

x

x

x

x

OC-3c
Interface Module

x

622-Mbps
Port Adapter

x

x

x

x

OC-12c
Interface Module

x

T1 and E1
Port Adapters

x

x

x

x

CE1 Frame Relay
Port Adapter

x

x

x

x

CES
Port Adapter

x

x

x

x

DS3 and E3
Port Adapters

x

x

x

x

CDS3 Port Adapter

x

x

x

Table 1-1: **System Support for ATM Port Adapters and Interface Modules**
Port Adapters and Interface Modules	Catalyst 8540 MSR	Catalyst 8510 MSR	Catalyst 5500	LightStream 1010
25-Mbps Port Adapter		x	x	x
155-Mbps Port Adapter	x	x	x	x
OC-3c Interface Module	x
622-Mbps Port Adapter	x	x	x	x
OC-12c Interface Module	x
T1 and E1 Port Adapters	x	x	x	x
CE1 Frame Relay Port Adapter	x	x	x	x
CES Port Adapter	x	x	x	x
DS3 and E3 Port Adapters	x	x	x	x
CDS3 Port Adapter	x	x		x

Note The Catalyst 5500 systems support additional port adapters not described in this guide.

Product Description

ATM port adapters and interface modules provide ports for connection to network services. You can install up to two half-width port adapters in one slot of the ATM switch. Interface modules are full-width and occupy the entire slot in the ATM switch.

You can install up to two half-width port adapters in a carrier module in the
Catalyst 8540 MSR, Catalyst 8510 MSR, Catalyst 5500, and LightStream 1010. Carrier modules used in Catalyst 8510 MSR, Catalyst 5500, and LightStream 1010 are interchangeable. Carrier modules used in Catalyst 8540 MSR are designed for use specifically for the Catalyst 8540 MSR and are not interchangeable with the other systems. Full-width interface modules supported by the Catalyst 8540 MSR do not require installation via a carrier module.

Table 1-2 shows which slots are reserved for port adapters and interface modules in each system.

Table 1-2: Slot Assignment for Port Adapters and Interface Modules
System Chassis Type Port Adapters and Interface Modules

Catalyst 8540 MSR

13 Slots

Slots 0 to 3 and Slots 9 to 12

Catalyst 8510 MSR

5 Slots

Slot 0, Slot 1, Slot 3, and Slot 4

Catalyst 5500

13 Slots

Slots 9 to 12

LightStream 1010

5 Slots

Slot 0, Slot 1, Slot 3, and Slot 4

**Table 1-2: Slot Assignment for Port Adapters and Interface Modules**
System	Chassis Type	Port Adapters and Interface Modules
Catalyst 8540 MSR	13 Slots	Slots 0 to 3 and Slots 9 to 12
Catalyst 8510 MSR	5 Slots	Slot 0, Slot 1, Slot 3, and Slot 4
Catalyst 5500	13 Slots	Slots 9 to 12
LightStream 1010	5 Slots	Slot 0, Slot 1, Slot 3, and Slot 4

Figure 1-1 shows an ATM port adapter.

Figure 1-1: Typical ATM Port Adapter

The ports on each adapter and interface module can be configured as redundant links using the ATM switch routing protocols. Each port has receive and transmit LEDs that provide port status and operation information.

Figure 1-2 shows an interface module.

Figure 1-2: Typical Full-Width Interface Module

Note The ATM switch powers up automatically. All configuration information for port adapters and interface modules is saved between hot swaps and switch reboots, while interface types are discovered automatically by the switch. This eliminates mandatory manual configuration.

Common Features

ATM port adapters and interface modules share the following common features:

ATM Port Addresses

Each interface (or port) in the switch is designated by several different types of addresses. The physical interface address is the actual physical location (card/subcard/port) of the interface connector within the chassis. The system software uses the physical addresses to control activity within the switch and to display status information. These physical card/subcard/port addresses are not used by other devices in the network; they are specific to the individual switch and its internal components and software.

Port IDs

In the ATM switch, port IDs specify the actual physical location of each port on the front of the switch. (See Figure 1-3.) The address is composed of a three-part number in the format card/subcard/port.

Figure 1-3: Port ID Address Examples (LightStream 1010 shown)

The first number identifies the slot in which the module is installed. Module slots are numbered from top to bottom starting with slot 0 at the top of the chassis. The second number identifies the subcard or port adapter number. The port adapters are numbered 0 and 1, with 0 being the left port adapter facing the front of the switch. The third number identifies the physical port number on the module. The port numbers always begin at 0 and are numbered from the left port to the right port, facing the front of the switch. The number of additional ports (/1, /2, and so on) depends on the number of ports available on the module.

Interface ports maintain the same port ID regardless of whether other modules are installed or removed. However, when you move a module to a different slot, the first number in the address changes to reflect the new slot number.

For example, on a four-port 155-Mbps UTP port adapter in chassis slot 1 in port adapter slot 0, the address of the left port is 1/0/0 and the address of the right port is 1/0/3. If you remove the four-port 155-Mbps UTP port adapter from slot 1 and install it in slot 4, the addresses of those same ports become 4/0/0 and 4/0/3.

Displaying Port Interface Information

You can identify module ports by physically checking the card/subcard/port location on the front of the switch. You can also use software commands to display information about a specific interface, or all interfaces, in the switch. To display information about every interface, use the show interface command without parameters. To display information about a specific interface, use the show interface command with the interface type and port address in the format show interface atm card/subcard/port. This command is described in your command reference publication.

Port Adapter and Interface Module Clocking Options

Each port on the ATM port adapter and interface module can be configured to support the following clocking options:

Self-timing based on a Stratum 4-level clock
Loop timing from the received data stream---ideal for public network connections
Timing synchronized to a selected master clock port, required to distribute a single clock across a network

Note The 25-Mbps port adapter supports single, local clocking only.

Traffic Pacing

Traffic pacing allows you to set the aggregate output traffic rate on any port to a rate below the interface rate. This feature is useful when communicating with a slow receiver or when connected to public networks with peak-rate tariffs.

Note The chapters that follow describe features specific to each port adapter and interface module.

Table of Contents

Overview of ATM Port Adapters and Interface Modules