Table Of Contents
Installing the 75-Ohm In-line Coaxial Attenuator on Cisco Port Adapters
Installing the 75-Ohm In-line Coaxial Attenuator
Obtaining Technical Assistance
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:
•Installing the 75-Ohm In-line Coaxial Attenuator
•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
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Ordering Documentation
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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
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Technical Assistance Center
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•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
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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:
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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.
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