Cisco Prisma HDRx Reverse Optical Receiver Platform & Power Supply System Technical References

Prisma II HDTx RF Output Level
Jump Issue Technical Bulletin

Overview

Purpose

The purpose of this document is to inform Prisma II

™

High Density Transmitter

(HDTx) users of a possible issue that receiver RF output level increases about 3~5

dB when the automatic gain control (AGC) is turned from OFF to ON.

Audience

This document is written for system engineers and managers, who are responsible

for operating and/or maintaining the Prisma II equipment.

Situation

We have received customer comments regarding issues that receiver RF output

level may increase 3~5 dB when the AGC feature of the HDTx is turned from OFF

to ON. An analysis was conducted by us. This analysis indicated that the problem

is associated with 3 dB offset in RF AGC set point between CW ON and OFF

mode in the unit.

Customer Exposure

A few customers may experience this kind of issue if they have HDTxs

manufactured in or before January 2006 (A06) and with serial number beginning

with “MM”.