Gain Maker

' 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1

Gainmaker 4-portSegmentable Node

Given by Uwe HasenfussSA Network Consulting Engineer

December 2009


Topics

Overview

Mechanical Install

Components

Powering

Balancing

Troubleshooting

Note: All following information can also be found in the Installation and Operation guide

Gainmaker 4-port segmentable Node


Overview

1 GHz Forward Path

High Output Gain Stages

4 splits (40/52, 42/54, 65/86, 55/70)

No Forward Segmentation

No Forward Redundancy

No AGC not applicable for nodes

Single Power Supply (No Dual AC Input Capability)


Reverse Transmitters FP, DFB, CWDM, DWDM available

Reverse Segmentation (left / right only)

Reverse Redundancy (if not segmented)

Input Pad and RF test point for each Reverse Input

Fiber Management tray

Optional Plug-In Status Monitor

Overview


Overview

Receiver wavelength 1310 / 1550 nm

Optical Input Range - 3 to +2 dBm (0.5 to 1.6 mW)

Pass Band 52 1002 MHz

Optical Input Testpoint 1V / mW

Operational gain 41 dB

Testpoints - 20 dB

Rev TX Optical Output 1310/CWDM 3 dBM / DWDM 7 dBm

Power Consumption 93 W


Housing -Dimensions

Weight: 10.2 kgWith 1 TX, 1RX, PS


Housing -Open and Closing


Housing -Open and Closing

Torque 6.8 Nm to 16.3 Nm


Housing -Connection ports

Fiber In/Out

Coax ports in the base

Optical port in the lid


Mounting

Due to the weight of the equipment and safety reasons, it is recommended to have two people available for mounting.! !

Strand - mounting


Mounting

Strand - mounting


Pedestal - mounting

Mounting


Mounting

Pedestal - mounting


Connecting CablesFiber Optic Cable



WARNING!

ALWAYS CHECK THE OPTICAL LEVEL BEFORE CONNECTING ANY

OPTICAL CABLES


Connecting CablesCoaxial Cable


Powering


Unit modules

Optical Receiver

Optical Reverse

Transmitter

Power Supply

4-port Amplifier

Return path configuration

plugin

Fiber Management Tray

Above Optical Modules


Optical componentsReverse - Transmitter


Optical componentsForward - Receiver


Installing / Replacing optical components


Installing / Replacing optical componentsExample: Transmitter The Receivers are treated equally


Installing / Replacing optical components

Example: Transmitter The Receivers are treated equally


RF Setup Components


Setup and BalancingBlock Diagramm


Setup and BalancingSignalflow Forward Path


Setup and BalancingSignalflow Reverse Path


Setup and BalancingReverse Path Configurations


Setup and BalancingEquipment


Setup and BalancingForward Path Balancing

WARNING!

ALWAYS CHECK THE OPTICAL LEVEL BEFORE CONNECTING ANY

OPTICAL CABLES


Setup and BalancingForward Path Balancing

To complete the balancing procedure the following steps are necessary

Check the optical Input level

Set the RF Output Level of the optical Receiver

Determine the Output Tilt

Set the Output Tilt

Set the Output Level


Setup and Balancing Forward Path

Check the optical Input Level

Check the optical Input level of the Receiver, using an optical Powermeter or Voltmeter

Ensure the optical Input level is within specificationof the Receiver (-3...+2 dBm)

Check the optical Input level versus the design If the level is out of tolerance, troubleshoot beforeproceeding with the setup

Note: The Amplifier cannot be balanced without the proper input signal



Note: Minimum Receiver RF output with optical input of 0 dBm



Verify the RF Input Level of the Amplifier


Setup and Balancing Forward PathDetermine the Output Tilt


Setup and Balancing Forward PathSet the Output Tilt



Set the Output Level


Setup and Balancing Reverse Path

Methods of Reverse Path Balancing

There are various possibilities how to setup the Measurement Equipment for balancing the Reverse Path.

The main issue is that the measurement has to be performed at a different location than the configuration.

e.g. Balancing the optical link between the Node and the Hub or HeadendThe configuration is done at the node but the measurement has to be done at the Headend.

These are two possible examples how to do it.




Adjustment w ith Spectrum Analyzer & Video Camera




Adjustment w ith Stealth Sweeper



To complete the balancing procedure the following steps are necessary

Verify optical Input Level of Receiver versus Design

Check the design for the calculated Pad values (Att, Tilt)

Inject Signal into Reverse Injection point

Check RF Output of Receiver in Headend

Adjust Receiver Output level

Balance Reverse Path on Amplifiers

Reverse Path Balancing

Note: Always balance the fiber link first, before balancing any Amplifiers in the plant



Verify optical Input Level of Receiver versus Design

!! Check Optical Input Level of Receiver versus Receiver Datasheet !!

Verify using an optical Powermeter the optical input level of the Optical Receiver in the Headend and compared with designed value.

Note: It is good practice to set up the link with the highest optical loss budget first



Check the design for the calculated Pad values (Att, Tilt)



Check RF Output of Receiver in Headend



Adjust the RF Output of Receiver in Headend


Troubleshooting

Equipment


TroubleshootingAC Power


Troubleshooting

AC Power


TroubleshootingDC Power


Troubleshooting

DC Power


Troubleshooting

Low RF Output


Troubleshooting

No Forward RF Signal


Troubleshooting

Low or Degraded Forward RF Signal


Troubleshooting

Carrier to Noise Problems


Troubleshooting

Miscellaneous Problems


LCM

Documents

Gain Maker