The 16-Port OC-3c Interface Module

This chapter describes the 16-port OC-3c interface module that is supported in the
Catalyst 8540 MSR.

This chapter includes the following sections:

Overview of the OC-3c Interface Module

The OC-3c multimode interface module is used for intercampus or wide-area links. The OC-3c interface module supports MT-RJ duplex optical media connectors.

Interface Ports Supported

The Catalyst 8540 MSR supports up to eight OC-3c interface modules with a maximum of 128 OC-3c interface ports.

Note The Catalyst 8510 MSR, Catalyst 5500, and LightStream 1010 do not support the 16-port OC-3c interface module.

Figure 5-1 shows a 16-port OC-3c multimode interface module.

Figure 5-1: OC-3c Interface Module

ATM Connections Supported

The 16-port OC-3c multimode interface module provides short-reach intercampus and WAN ATM connections up to 500m. (See Figure 5-2.)

Figure 5-2: OC-3c Interface Module ATM Intercampus and WAN Connections

Cabling the OC-3c Interface Module

This section describes supported cabling configurations for the OC-3c interface module, which provides multimode connections.

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

OC-3c Interface Module Supported Interfaces

The OC-3c interface module provides an interface to ATM switching fabrics for transmitting and receiving data bidirectionally at up to 155 Mbps. The OC-3c interface module can support interfaces that connect to the OC-3c multimode fiber-optic---STS-3C/STM1 physical layer.

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

OC-3c Interface Module Connectors

To connect the OC-3c interface module to the external ATM switch, use MT-RJ connectors. See Figure 5-3 for multimode fiber-optic connections with MT-RJ connectors.

Figure 5-3: OC-3c Multimode Fiber-Optic Connections and LEDs

Note For a description of the MT-RJ connector, see the "ATM Connection Equipment Requirements" section. (See Figure 2-3.)

OC-3c Interface Module LEDs

The LEDs provide status information for the individual OC-3c multimode interface connections. The LEDs are described in Table 5-1 and shown in Figure 5-3.

Table 5-1: OC-3c Interface Module LED Descriptions
LED Description

LINK

Off---Carrier detect signal not received
Green---Carrier detect signal received

RX (receive)

Off---Administratively down or LOS¹
Flashing green---Cells being received: 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.

LED	Description
LINK	Off---Carrier detect signal not received Green---Carrier detect signal received
RX (receive)	Off---Administratively down or LOS¹ Flashing green---Cells being received: 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

Table of Contents

The 16-Port OC-3c Interface Module