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Cisco Port Adapters

Installing the 75-Ohm In-line Coaxial Attenuator on Cisco Port Adapters

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Installing the 75-Ohm In-line Coaxial Attenuator on Cisco Port Adapters

Table Of Contents

Installing the 75-Ohm In-line Coaxial Attenuator on Cisco Port Adapters

Introduction

Product Description

Installing the 75-Ohm In-line Coaxial Attenuator

Obtaining Documentation

World Wide Web

Documentation CD-ROM

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Cisco.com

Technical Assistance Center

Cisco TAC Web Site

Cisco TAC Escalation Center


Installing the 75-Ohm In-line Coaxial Attenuator on Cisco Port Adapters


Product Number: ATTEN-KIT-PA=

Introduction

This document describes the installation of the 75-ohm in-line coaxial attenuator on any Cisco port adapter.

This document contains the following sections:

Product Description

Installing the 75-Ohm In-line Coaxial Attenuator

Obtaining Documentation

Obtaining Technical Assistance

Product Description

The 75-ohm in-line coaxial attenuator is purchased in a kit (ATTEN-KIT-PA=) containing five attenuators with fixed values ranging from 3-dB to 20-dB. The kit was designed for use with Cisco T3 port adapters when the port adapter is found to be experiencing line code violations (LCVs). LCVs occur when the far end equipment transmit signal saturates the front end receiver of the T3 port adapter. The attenuators are used to reduce the signal strength. Each kit contains a 3-dB, 6-dB, 10-dB, 15-dB, and 20-dB attenuator with standard BNC connectors (see Figure 1).

Figure 1 75-Ohm In-line Coaxial Attenuator

Installing the 75-Ohm In-line Coaxial Attenuator

The 75-ohm in-line coaxial attenuator kit contains five different fixed-value attenuators because signal strengths vary and the attenuation needed will differ from one installation to another. Use the following procedure to determine and install the correct value attenuator:


Step 1 Verify that the Cisco T3 port adapter and the device it is connected to at the far end are properly configured for short cable use and that the clocking is set correctly.

Step 2 Disconnect the cable from the receive port of the port adapter.

Step 3 Select the 3-dB attenuator and connect it to the receive port of the port adapter (see Figure 2).

Step 4 Connect the incoming signal cable to attenuator (see Figure 2).

Step 5 Use the show controller command to check for LCV errors.

Step 6 If the output of the show controller command shows LCV errors, repeat Steps 2 through 6 using the next highest value attenuator. Continue this process until the output of the show controller command shows zero LCV errors.


Figure 2 Connecting a 75-Ohm In-line Coaxial Attenuator to a T3 Port Adapter

Obtaining Documentation

These sections explain how to obtain documentation from Cisco Systems.

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at this URL:

http://www.cisco.com

Translated documentation is available at this URL:

http://www.cisco.com/public/countries_languages.shtml

Documentation CD-ROM

Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which is shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.

Ordering Documentation

You can order Cisco documentation in these ways:

Registered Cisco.com users (Cisco direct customers) can order Cisco product documentation from the Networking Products MarketPlace:

http://www.cisco.com/cgi-bin/order/order_root.pl

Registered Cisco.com users can order the Documentation CD-ROM through the online Subscription Store:

http://www.cisco.com/go/subscription

Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California, U.S.A.) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387).

Documentation Feedback

You can submit comments electronically on Cisco.com. In the Cisco Documentation home page, click the Fax or Email option in the "Leave Feedback" section at the bottom of the page.

You can e-mail your comments to bug-doc@cisco.com.

You can submit your comments by mail by using the response card behind the front cover of your document or by writing to the following address:

Cisco Systems
Attn: Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883
We appreciate your comments.

Obtaining Technical Assistance

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.

Cisco.com

Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.

Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you with these tasks:

Streamline business processes and improve productivity

Resolve technical issues with online support

Download and test software packages

Order Cisco learning materials and merchandise

Register for online skill assessment, training, and certification programs

If you want to obtain customized information and service, you can self-register on Cisco.com. To access Cisco.com, go to this URL:

http://www.cisco.com

Technical Assistance Center

The Cisco Technical Assistance Center (TAC) is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC Web Site and the Cisco TAC Escalation Center.

Cisco TAC inquiries are categorized according to the urgency of the issue:

Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration.

Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.

Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.

Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.

The Cisco TAC resource that you choose is based on the priority of the problem and the conditions of service contracts, when applicable.

Cisco TAC Web Site

You can use the Cisco TAC Web Site to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to this URL:

http://www.cisco.com/tac

All customers, partners, and resellers who have a valid Cisco service contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to this URL to register:

http://www.cisco.com/register/

If you are a Cisco.com registered user, and you cannot resolve your technical issues by using the Cisco TAC Web Site, you can open a case online by using the TAC Case Open tool at this URL:

http://www.cisco.com/tac/caseopen

If you have Internet access, we recommend that you open P3 and P4 cases through the Cisco TAC Web Site.

Cisco TAC Escalation Center

The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.

To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to this URL:

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml

Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled: for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). When you call the center, please have available your service agreement number and your product serial number.