Four-Port OC-12c Interface Modules

This chapter describes the four-port OC-12c interface module that is supported in the Catalyst 8540 MSR. This chapter includes the following sections:

• About OC-12c Interface Modules
  
  
• Cabling OC-12c Interface Modules
  
  

About OC-12c Interface Modules

The OC-12c interface module is used for intercampus or wide-area links. The OC-12c interface module supports a dual SC-type connector.

The following OC-12c interface modules are described in this chapter:

• OC-12c multimode interface module
  
  
• OC-12c single-mode interface module
  
  

Interface Ports Supported

The Catalyst 8540 MSR supports up to a maximum of eight OC-12c interface modules with a maximum of 32 OC-12c interface ports. The four ports are available in either multimode or single-mode connectors. (See Figure 8-1.)

Figure 8-1: The OC-12c Interface Module

ATM Connections Supported

The OC-12c interface module has four ports that provide the following ATM connections, as shown in Figure 8-2:

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

Figure 8-2: OC-12c Interface Module Short and Intermediate Reach ATM Connections

JATE Approval

The OC-12c interface module with multimode and single-mode connections meets the Japan Approvals Institute for Telecommunications Equipment (JATE) approval. See Table 8-1 for JATE approval details for the OC-12c port adapter.

Cabling OC-12c Interface Modules

This section describes supported cabling configurations for the OC-12c interface module, which provides multimode and single-mode 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. Do not mix single-mode or multimode ports or cables.

OC-12c Interface Module Supported Interfaces

The OC-12c interface module can support interfaces that connect to the following physical layers:

• OC-12c multimode fiber-optic—STS-12c/STM-4c
  
  
• OC-12c single-mode fiber-optic—STS-12c/STM-4c
  
  

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Note   See Table B-1 for cabling requirements.

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OC-12c Interface Module Connectors

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

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

Figure 8-3: OC-12c Fiber-Optic Connections and LEDs

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

OC-12c Interface Module LEDs

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