The 155-Mbps Port Adapter

This chapter describes the 155-Mbps port adapter that is supported in the following systems:

Catalyst 8540 MSR
Catalyst 8510 MSR
Catalyst 5500
LightStream 1010

This chapter includes the following sections:

Overview of the 155-Mbps Port Adapter

The 155-Mbps Synchronous Optical Network (SONET) STS3C/SDH STM1 port adapter is used for intercampus or wide-area links. The 155-Mbps port adapter supports SC-type and unshielded twisted-pair (UTP) connectors.

Interface Ports Supported

The ATM switch supports any port adapter combination required. Table 4-1 identifies the maximum number of 155-Mbps interface ports supported in each system.

Table 4-1: Maximum Interface Ports Supported by System Type
System Type Maximum Number of 155-Mbps Interface Ports

Catalyst 8540 MSR

64

Catalyst 8510 MSR

32

Catalyst 5500

32

LightStream 1010

32

Table 4-1: **Maximum Interface Ports Supported by System Type**
System Type	Maximum Number of 155-Mbps Interface Ports
Catalyst 8540 MSR	64
Catalyst 8510 MSR	32
Catalyst 5500	32
LightStream 1010	32

Figure 4-1 shows a 155-Mbps port adapter that supports UTP connectors.

Figure 4-1: 155-Mbps Port Adapter with UTP5 Connectors

ATM Connections Supported

The 155-Mbps port adapter has four ports that provide the following ATM connections, as shown in Figure 4-2:

The 155-Mbps single-mode port provides WAN or intercampus ATM connections.
The 155-Mbps multimode port provides intercampus ATM connections.
The 155-Mbps UTP-5 port provides desktop-to-wiring-closet ATM connections.

Figure 4-2: 155-Mbps Port Adapter ATM Intercampus and WAN Connections

Cabling the 155-Mbps Port Adapter

This section describes supported cabling configurations for the 155-Mbps port adapter, which provides single-mode, multimode, mixed (one single-mode and three multimode), and UTP connections.

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

155-Mbps Port Adapter Supported Interfaces

The 155-Mbps port adapter provides an interface to ATM switching fabrics for transmitting and receiving data at up to 155 Mbps bidirectionally. The 155-Mbps port adapters can support interfaces that connect to the following physical layers:

SONET 155-Mbps multimode fiber-optic---STS-3C
SONET 155-Mbps single-mode fiber-optic---STS-3C
SONET 155-Mbps UTP-5---STS-3C

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

155-Mbps Port Adapter Connectors

To connect the 155-Mbps port adapter to the external ATM switch, use the following connectors. (See Figure 4-3 for UTP and single- and multimode fiber-optic connections. See Figure 4-4 for single-mode fiber-optic and long reach connections.)

For multimode, single-mode, and mixed single-mode traffic, use an SC-type connector.
For UTP traffic, use an RJ-45 connector.

Figure 4-3: 155-Mbps UTP, Multimode, and Single-Mode Connections and LEDs

Note For a description of these connectors, see the "ATM Connection Equipment Requirements" section. (Figure 2-2 shows an SC-type connector. Figure 2-3 shows an RJ-45 connector.)

Figure 4-4: 155-Mbps Single-Mode Connections and LEDs

155-Mbps Port Adapter LEDs

The LEDs provide status information for the individual 155-Mbps single-mode, multimode, and UTP interface connections. The LEDs are described in Table 4-2 and shown in Figure 4-3 and Figure 4-4.

Table 4-2: 155-Mbps Port Adapter LED Descriptions
LED Description

RX (receive)

Off---LOS¹ or shutdown
Flashing green---Cells being received: blinks every five seconds and pulse rate increases with data rate
Red---Alarm (LOF², OCD³, AIS⁴, LOP⁵)

TX (transmit)

Off---No transmit line activity and administratively down
Flashing green---Cells being transmitted: pulse rate increases with data rate
Flashing yellow---Loopback
Steady yellow---RDI⁶

¹LOS = loss of signal.
²LOF = loss of frame.
³OCD = out of cell delineation.
⁴AIS = alarm indication signal.
⁵LOP = loss of pointer.
⁶RDI = remote defect indicator.

**Table 4-2: 155-Mbps Port Adapter LED Descriptions**
LED	Description
RX (receive)	Off---LOS¹ or shutdown Flashing green---Cells being received: blinks every five seconds and pulse rate increases with data rate Red---Alarm (LOF², OCD³, AIS⁴, LOP⁵)
TX (transmit)	Off---No transmit line activity and administratively down Flashing green---Cells being transmitted: pulse rate increases with data rate Flashing yellow---Loopback Steady yellow---RDI⁶

Note Single-mode fiber-optic interface connectors are blue, while multimode connectors are black.

Table of Contents

The 155-Mbps Port Adapter