OC-48c Interface Modules

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

• About OC-48c Interface Modules
  
  
• Cabling OC-48c Interface Modules
  
  

About OC-48c Interface Modules

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:

• 1-port OC-48c single-mode long reach plus 4-port OC-12c single-mode fiber
  
  
• 2-port OC-48c single-mode long reach
  
  
• 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 fiber
  
  

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

Figure 9-1: OC-48c Interface Module Occupying Two Slots in the Catalyst 8540 MSR

Interface Ports Supported

The Catalyst 8540 MSR supports up to a maximum of four OC-48c interface modules. Table 9-1identifies 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.

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:

• OC-48c single-mode long reach interfaces provide ATM connections
  up to 80 km.
  
  
• OC-48c single-mode intermediate reach interfaces provide ATM connections up to 15 km.
  
  
• OC-12c single-mode intermediate reach interfaces provide ATM connections up to 15 km.
  
  
• OC-12c multimode short reach interfaces provide ATM connections up
  to 500 m.
  
  

The OC-48c interface module provides ATM connections as shown in Figure 9-2.

Figure 9-2: OC-48c Interface Module ATM Connections

Cabling OC-48c Interface Modules

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
  
  

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Note   See Table B-1 for cabling requirements.

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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. (See Figure 9-3.)

Note   See "Connectors and Connector Pinouts," for more SC-type connector information.

Figure 9-3: OC-48c Fiber-Optic Connections and LEDs

Caution   If you are attaching a short cable to the OC-48c or the OC-12c single-mode port adapter, you must add 10 dB of attenuation in the interface, or the transmitter overdrives the receiver and introduces 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 9-3 and described in Table 9-2.