Cisco Systems PA-POS-1OC3 Using loopback Commands, Configuring an Interface for Internal Loopback

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Chapter 4 Configuring the PA-POS-1OC3

Checking the Configuration

If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), and repeat the ping command.

Using loopback Commands

The loopback test allows you to troubleshoot, detect, and isolate equipment malfunctions by testing the connection between the OC-3 interface and a remote device. The loopback command places an interface in internal loopback (also called local loopback) or line loopback mode, which enables test packets that are generated from the ping command to loop through a remote device or a cable. If the packets complete the loop, the connection is good. If not, you can isolate a fault to the remote device or the cable in the path of the loopback test.

Note Engaging line loopback automatically switches the interface to loop timing. The interface switches back to the user-specified timing source once the loopback is disengaged.

Configuring an Interface for Internal Loopback

The default loopback setting is for no loopback. With internal (or local) loopback, packets from the router are looped back in the framer. Outgoing data gets looped back to the receiver without actually being transmitted. Internal loopback is useful for checking that the PA-POS-1OC3 is working.

Step 1 To configure an interface for internal loopback, enter the loop internal command:

Router(config)# interface pos 3/0

Router(config-if)# loop internal

Step 2 To disable internal loopback, enter the no loop internal command.

Router(config)# interface pos 3/0

Router(config-if)# no loop internal

Configuring an Interface for Line Loopback

Note Engaging line loopback automatically switches the interface to loop timing. It switches back to the user-specified timing source when the loopback is disengaged.

The default loopback setting is for no loopback. With line loopback, the receive (RX) fiber is logically connected to the transmit (TX) optical fiber cable so that packets from the remote router are looped back to it. Incoming data gets looped around and retransmitted to the remote end omitting the received part, which is of no significance.

PA-POS-1OC3 Single-Port Port Adapter Installation and Configuration Guide

 

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Contents Text Part Number OL-6514-04 Americas HeadquartersCopyright 2007 Cisco Systems, Inc. All rights reserved N T E N T S Cisco 7401ASR Router Cisco 7401ASR Router-Removing and Installing a Port Adapter OL-6514-03 Document Version History ObjectivesVersion Date Organization Related DocumentationSection Title Description Preface Related Documentation OL-6514-04 PA-POS-1OC3 Overview PA-POS-1OC3 OverviewSDH Equivalent SONET/SDH OverviewFeatures OC-3 Optical Fiber Specifications Interface SpecificationsNetwork Management Support LED Label Color State Function Using Statistics to Estimate Link Loss and Power BudgetLEDs Encapsulation Method SupportRCV Cables and ConnectorsCisco 7200 VXR Routers Slot Numbering Port Adapter Slot Locations on the Supported PlatformsCisco 7200 Series VXR Cisco 7201 Router Slot NumberingCisco 7304 PCI Port Adapter Carrier Card Slot Numbering Cisco 7301 Router Slot NumberingModule Slots on the Cisco 7304 Router Cisco 7401ASR Router Slot Numbering10 VIP Slot Locations Cisco 7500 Series Routers with VIP Slot NumberingRSP Cisco 7505 Router Slot NumberingVIP interface-slot RSP-slot Cisco 7507 Router Slot Numbering6 8 10 Cisco 7513 Router Slot NumberingSUPERVISOR2 Cisco 7603 Router Slot NumberingCisco 7606 Router Slot Numbering FAN Status Cisco 7609 Router Slot NumberingCisco 7613 Router Slot Numbering Platform Interface Address Format Numbers Syntax Identifying Interface AddressesCisco 7200 VXR Routers Interface Addresses Cisco 7201 Router Interface AddressesCisco 7301 Router Interface Addresses Cisco 7500 Series Routers VIP Interface Addresses Cisco 7401ASR Router Interface AddressesCisco 7600 Series Routers FlexWAN Module Interface Addresses OL-6514-04 Required Tools and Equipment Preparing for InstallationSoftware and Hardware Requirements Cisco 7200 VXR RoutersPlatform Recommended Minimum Cisco IOS Release Checking Hardware and Software Compatibility Safety Warnings Safety GuidelinesWarnung Wichtige Sicherheitshinweise Avvertenza Importanti Istruzioni Sulla SicurezzaAviso Instruções Importantes DE Segurança Guarde Estas Instrucciones GEM Disse Anvisninger OL-6514-04 Electrical Equipment Guidelines Preventing Electrostatic Discharge Damage Telephone Wiring GuidelinesFCC Class a Compliance Laser SafetyOL-6514-04 Handling Port Adapters Removing and Installing the PA-POS-1OC3Handling a Port Adapter Online Insertion and RemovalOIR Functional Description Port Adapter Removal and Installation Step Cisco Cisco 7201 Router-Removing and Installing a Port AdapterCisco 7301 Router-Removing and Installing a Port Adapter OL-6514-04 CC-PA Cisco 7401ASR Router-Removing and Installing a Port Adapter With the screw removed, grasp Screw TX RX Connecting PA-POS-1OC3 Interface CablesReplacing the SFP Optics Module Handling the SFP Optics ModuleRemoving the SFP Optics Module Installing the SFP Optics Module Inserting an SFP Optics Module Verifying the SFP Optics Module InstallationPage OL-6514-04 Using the Exec Command Interpreter Configuring the PA-POS-1OC3Parameter Configuration Commands Default Value Configuring the InterfacesShutting Down an Interface Platform Command ExampleSlot/port-adapter/port Show interfaces pos, followed by Show interfaces pos followed by Performing a Basic ConfigurationInterface pos, followed by Customizing the Configuration Setting the MTU Size Configuring FramingSetting the Source of the Transmit Clock Configuring Sonet Payload Scrambling Configuring Cyclic Redundancy ChecksBasic APS Configuration Configuring APSChecking the Configuration Using show Commands to Verify the New Interface StatusCommand Function Example Show controllers Using the show version or show hardware Commands Cisco 7201 Router-Example Output of the show version Command Router#show version Port adapter is analyzed Using the show diag CommandCisco 7201 Router-Example Output of the show diag Command Router#show diag Router# show interfaces pos 4/0 PE3#sh int pos4/1 Using the show interfaces CommandRouter# show interfaces Router# ping 10.0.0.10 Return Using the ping Command to Verify Network ConnectivityUsing loopback Commands Configuring an Interface for Internal LoopbackConfiguring an Interface for Line Loopback Push Mode Description First router PA-POS-1OC3 Error MessagesPA-POS-1OC3 Statistics Counters Making a Back-to-Back ConnectionConfiguring the PA-POS-1OC3 Making a Back-to-Back Connection

PA-POS-1OC3, PA-POS-2OC3 specifications

Cisco Systems has long been at the forefront of networking technology, providing solutions that empower organizations to enhance their connectivity and communication capabilities. Among its impressive lineup, the PA-POS-2OC3 and PA-POS-1OC3 modules stand out as significant components designed to optimize performance in service provider and enterprise environments.

The PA-POS-2OC3 and PA-POS-1OC3 modules are designed for use with the Cisco 7600 Series routers and are tailored for Packet Over SONET (POS) transport. Supporting the OC-3 speed of 155.52 Mbps, these modules provide reliable high-speed connectivity, enabling organizations to efficiently manage data traffic and ensure rapid data transfer across their networks. The PA-POS-2OC3 offers dual OC-3 capabilities, allowing for higher aggregate bandwidth and redundancy options, making it common in demanding network environments.

One of the main features of the PA-POS-2OC3 and PA-POS-1OC3 is their enhanced support for advanced networking protocols, including MPLS (Multiprotocol Label Switching). MPLS facilitates efficient data routing and improves bandwidth utilization by enabling multiple types of traffic to be consolidated over a single network. This is crucial for organizations looking to deploy services like VoIP, video conferencing, and other bandwidth-intensive applications.

The modules also offer robust error correction and monitoring capabilities, which are essential for maintaining service quality in mission-critical applications. Administrators can monitor performance and diagnose issues in real-time, enabling swift responses to potential concerns that could disrupt service.

Moreover, the PA-POS-2OC3 and PA-POS-1OC3 are designed with features that support enterprise-grade security and scalability. This is particularly beneficial for organizations expecting growth or requiring enhanced protection for sensitive data as it traverses the network.

In summary, Cisco's PA-POS-2OC3 and PA-POS-1OC3 modules represent essential building blocks for high-speed networking solutions. Their support for OC-3 connectivity, advanced routing protocols, and robust monitoring capabilities make them ideal for both service providers and enterprises. Through increased scalability, improved bandwidth management, and enhanced security, these modules allow organizations to adapt to the ever-evolving landscape of data communications effectively. With Cisco at the helm, businesses can trust in a networking solution that not only meets current demands but is also primed for future growth.
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