The OC-48c Interface Module

This chapter describes the OC-48c interface modules that are supported in the
Catalyst 8540 MSR.

This chapter includes the following sections:

Overview of the OC-48c Interface Module

The OC-48c interface module is a full-width interface module that meets the high capacity requirements of large enterprise and service provider networks. The Catalyst 8540 MSR supports the following OC-48c interface modules:

2-port OC-48c single-mode intermediate reach
1-port OC-48c single-mode intermediate reach plus 4-port OC-12c single-mode
intermediate reach
1-port OC-48c single-mode intermediate reach plus 4-port OC-12c multimode

Each OC-48c interface module occupies two full-width card slots in the Catalyst 8540 MSR. For example, you can install an OC-48c interface module in slots 0 and 1, 2 and 3, 9 and 10, and 11 and 12. (See Figure 8-1.)

Figure 8-1: Side View of OC-48c Interface Module Occupying Two Slots in the Catalyst 8540 MSR

The Catalyst 8540 MSR supports up to a maximum of four OC-48c interface modules. Table 8-1 identifies the maximum number of OC-48c and OC-12c ports on the OC-48c interface module that the Catalyst 8540 MSR supports. All the OC-48c and OC-12c interface ports support the dual SC-type connector.

Table 8-1: Maximum Interface Ports Supported by System Type

System Type Max. No. of Interface Ports
Using the 2-Port OC-48c
Interface Module Max. No. of Interface Ports
Using the 1-Port OC-48c plus
4-Port OC-12c Interface Module

Catalyst 8540 MSR

8 OC-48c ports

4 OC-48c ports
16 OC-12c ports

System Type	Max. No. of Interface Ports Using the 2-Port OC-48c Interface Module	Max. No. of Interface Ports Using the 1-Port OC-48c plus 4-Port OC-12c Interface Module
Catalyst 8540 MSR	8 OC-48c ports	4 OC-48c ports 16 OC-12c ports

Note The Catalyst 8510 MSR, Catalyst 5500, and LightStream 1010 do not support the OC-48c interface module.

ATM Connections Supported

The OC-48c interface module provides 2.488 Gbps ATM connections for high-speed enterprise campus networks and service provider networks. The OC-48c interface module is the concatenated version of OC-48 in which the entire 2.488 Gbps link is managed as a single payload. The OC-48c interface module provides high-density aggregation of lower speed interfaces such as Gigabit Ethernet, OC-3c, T1 and E1, and DS3 and E3.

The OC-48c interface module provides the following ATM connections, as shown in Figure 8-2:

OC-48c single-mode interfaces provide intermediate reach ATM connections up to 15 km.
OC-12c single-mode connectors provide intermediate reach ATM connections up to 15 km.
OC-12c multimode interfaces provides short reach ATM connections up to 500 m.

Figure 8-2: OC-48c Interface Module ATM Connections

Cabling the OC-48c Interface Module

This section describes supported cabling configurations for the OC-48c interface module, which provides single-mode and multimode connections.

Note All ATM interfaces are full duplex and are composed of two fibers, one for each link direction. You must use the appropriate ATM interface cable to connect the ATM single-mode or multimode interface with an external ATM network. You should not mix single-mode or multimode ports or cables.

OC-48c Interface Module Supported Interfaces

The OC-48c interface module can support interfaces that connect to the following physical layers:

OC-48c single-mode fiber-optic---STS-48c/STM-16
OC-12c single-mode fiber-optic---STS-12c/STM-4c
OC-12c multimode fiber-optic---STS-12c/STM-4c

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

OC-48c Interface Module Connectors

To connect the OC-48c single-mode interface modules to other OC-48c or OC-12c equipment through an optical link, use a dual SC-type connector for multimode and single-mode fiber-optic traffic. (Figure 8-3.)

Note For a description of an SC-type connector, see the "ATM Connection Equipment Requirements" section. (See Figure 2-2.)

Figure 8-3: OC-48c Fiber-Optic Connections and LEDs

Caution If you are attaching a short cable to the OC-48c or the OC-12c port adapter, you must add 10 dB of attenuation in the interface or the transmitter can overdrive the receiver and introduce data errors.

OC-48c Interface Module LEDs

The LEDs provide status information for the individual OC-48c single-mode, OC-12c single-mode, and the OC-12c multimode fiber-optic connections. The LEDs are shown in Figure 8-3 and described in Table 8-2.

Table 8-2: OC-48c Interface Module LED Descriptions

LED State Description

LINK

Off
Green

Carrier detect signal not received
Carrier detect signal received

RX (receive)

Off
Flashing green
Red

Administratively down or LOS¹
Cells being received: pulse rate increases with data rate
Alarm (LOF², OCD³, AIS⁴, LOP⁵)

TX (transmit)

Off
Flashing green
Flashing yellow
Steady yellow

No transmit line activity and administratively down
Cells being transmitted: pulse rate increases with data rate
Loopback
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	State	Description
LINK	Off Green	Carrier detect signal not received Carrier detect signal received
RX (receive)	Off Flashing green Red	Administratively down or LOS¹ Cells being received: pulse rate increases with data rate Alarm (LOF², OCD³, AIS⁴, LOP⁵)
TX (transmit)	Off Flashing green Flashing yellow Steady yellow	No transmit line activity and administratively down Cells being transmitted: pulse rate increases with data rate Loopback RDI⁶

Table of Contents

The OC-48c Interface Module