Table Of Contents
Installing the 75-Ohm In-line Coaxial Attenuator on Cisco Port Adapters
Product Number: ATTEN-KIT-PA=
This document describes the installation of the 75-ohm in-line coaxial attenuator on any Cisco port adapter.
This document contains the following sections:
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
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