Cisco Optical Reverse Transmitter Module for Compact Nodes Installation and Operation Guide
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Contents Important Safety Instructions ................................................................................................... v Preface .......................................................................................................................................... xi About this Guide ....................................................................................................................................... xi Purpose .........................................................
Contents, Continued To switch the Pilot Tone ON/OFF .............................................................................. 3-4 Chapter 4 Troubleshooting Transmitter signaling .............................................................................................................................. 4-2 To troubleshoot from the LEDs ................................................................................... 4-2 Further Assistance ..........................................................
Important Safety Instructions Read and Retain Instructions Carefully read all safety and operating instructions before operating this equipment, and retain them for future reference. Follow Instructions and Heed Warnings Follow all operating and use instructions. Pay attention to all warnings and cautions in the operating instructions, as well as those that are affixed to this equipment. Terminology The terms defined below are used in this document.
Important Safety Instructions Equipment Placement WARNING: Avoid personal injury and damage to this equipment. An unstable mounting surface may cause this equipment to fall. To protect against equipment damage or injury to personnel, comply with the following: Install this equipment in a restricted access location (access restricted to service personnel). Make sure the mounting surface or rack is stable and can support the size and weight of this equipment.
Important Safety Instructions, Continued This equipment may have two power sources. Be sure to disconnect all power sources before working on this equipment. If this equipment does not have a main power switch, the power cord connector serves as the disconnect device. Always pull on the plug or the connector to disconnect a cable. Never pull on the cable itself.
Important Safety Instructions, Continued If the plug still fails to fit, contact an electrician to replace the obsolete 2-terminal outlet. Grounding Terminal If this equipment is equipped with an external grounding terminal, attach one end of an 18-gauge wire (or larger) to the grounding terminal; then, attach the other end of the wire to a ground, such as a grounded equipment rack.
Important Safety Instructions, Continued General Servicing Precautions WARNING: Avoid electric shock! Opening or removing the equipment cover may expose you to dangerous voltages. Refer all servicing to qualified service personnel only. CAUTION: These servicing precautions are for the guidance of qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other than contained in the operating instructions unless you are qualified to do so.
Important Safety Instructions, Continued Fuse Replacement To replace a fuse, comply with the following: Disconnect the power before changing fuses. Identify and clear the condition that caused the original fuse failure. Always use a fuse of the correct type and rating. The correct type and rating are indicated on this equipment.
Preface About This Guide Purpose This guide provides instructions for installing, operation and troubleshooting the transmitter. Who Should Use This Document This document is intended for authorized service personnel who have experience working with similar equipment. The service personnel should have appropriate background and knowledge to complete the procedures described in this document.
Chapter 1 Introduction Overview Introduction This chapter provides an overview of this guide and of the Optical Reverse Transmitter (transmitter), including general description, overview and block diagram.
Description General Description The Reverse Optical Transmitter is a 5 – 300 MHz return path transmitter which plugs into the compact nodes. The module converts the upstream RF signals coming from the subscriber’s cable modem (CM) into an optical signal. To follow the evolving market requirements such as lower cost of ownership, reliability and performance it requires redesign of current module. Features The transmitter has the following features: 1-2 Bandwidth 5~300MHz.
Overview Product Overview The Reverse Optical Transmitter is a 5 – 300 MHz return path transmitter which plugs into many types of Node, like EGC FFDN and EGC Segmentation family, used for transmitting reverse signals from the node back to the headend. The transmitter features thermal compensation such that the drive level to the laser is held relatively stable over the full operating temperature range.
Overview, Continued Panel Illustration The following illustration shows panels of the optical reverse transmitter.
Overview, Continued Panel Functions The following table lists the functions of the front panel indicators on the optical reverse transmitter. Description MODE LED Function Green/OFF Indicator Green: Transmitter is working on the Burst mode OFF: Transmitter is working on the Normal mode OFF: Laser is switched off Green: Laser is switched on LASER LED OFF/Green/Yellow /RED Indicator Yellow: Laser aging - The laser is aged and uses more current than it did when it was installed.
Overview, Continued Fiber Tray The Fiber Tray secures any excess fiber and provides a location for storing SC fiber optical connector pairs.
Block Diagram The following is a block diagram of the optical reverse transmitter. Control & LEDs RTx Pilot Gen. µP O E Opt.
Chapter 2 Installation Overview Introduction This chapter provides instructions for installing the Optical Reverse Transmitter in the Compact Node.
Before You Begin Overview The procedures in this chapter assume that you have completed the following: Prepared the installation site Prepared the Cisco device to install the transmitter Install the device correctly Tools Before you start, make sure that you have the following tools: Torque wrench with a 1/2-inch socket Cross screwdriver Dimensions The following illustration shows dimensions of the optical reverse transmitter.
Installing and Remove Optical Reverse Transmitter To Install and Remove the Transmitter CAUTION: Make sure enough space is reserved for installing the transmitter. Remove any items both on the mainboard and on the lid if the node cannot be closed. Complete the following steps to install or remove the optical reverse transmitter to the optical section. 1. 2. Open the node housing. Open the fiber clip on the metal cover and wire the fiber in the fiber guide. 3.
Chapter 3 Operation Overview Introduction This chapter provides information on how to set up the Optical Reverse Transmitter.
Preparation Before You Begin The transmitter can be set up using the two push buttons and the mode switch on the transmitter. Setting Up The transmitter must be adjusted in order to ensure an optimal function. The adjustment of the mode takes place by means of the Mode Switch on the transmitter. The adjustment of the RF input level and the pilot tone level takes place by means of the keys (+) and (-) on the transmitter. A short press on the key will change the level in small steps.
Note: The level is including test point loss. The corresponding RF input value for RFoG mode is shown in the table at below. Optical Reverse level Min. level at Modulation measured on module input Index testpoint Attenuator = 0 dB 9% 61 71 10% 62 72 11% 63 73 13% 64 74 14% 65 75 18% 67 77 22% 69 79 32% 72 82 40% 74 84 79% 80 90 To set up the Pilot Level The level in the pilot tone can be changed ± 5 dB. The standard setting is 40 dBµV at the test point.
To switch the Pilot Tone ON/OFF The pilot tone is switched off by activating both keys (+) and (-) simultaneously twice. Then the pilot LED is switched off indicating that the pilot has been switched off. In order to switch on the pilot tone both keys (+) and (-) are pressed simultaneously only once. Thus the pilot LED flashes and the level can be changed. If the level is correct, the LED will flash quickly after 5 seconds and the current set-up is stored in the memory.
Chapter 4 Troubleshooting Overview This chapter describes the steps you may take to troubleshoot the Optical Reverse Transmitter for Cisco Compact Node.
Transmitter Signaling To Troubleshoot from the LEDs The following table lists the solutions with regard to the issues shown from the transmitter’s LED signaling. Problem Description The Laser LED is OFF Solution Verify the status of laser is off/on. Verify the power supply of the node. Verify that connectors of the transmitter are clicked into the interface connectors in the mainboard slot. Replace the transmitter in use with a new one in case it is broken.
Chapter 5 Customer Support Information If You Have Questions If you have technical questions, call Cisco Services for assistance. Follow the menu options to speak with a service engineer. Access your company's extranet site to view or order additional technical publications. For accessing instructions, contact the representative who handles your account. Check your extranet site often as the information is updated frequently.
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