Agilent 83491/2/3/4A
Clock Recovery Modules
User’s Guide
© Copyright 2000-2004
Agilent Technologies
All Rights Reserved. Reproduction, adaptation, or translation without prior written
permission is prohibit ed ,
except as allowed under copyright laws.
Agilent Part No. 83491- 90 01 4
Printed in USA
August, 2004
Agilent Technologies
Digital Signal Analysis
1400 Fountaingrove Parkway
Santa Rosa, CA 95403, USA
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Safety Symbols.
CAUTION
The caution sign denotes a
hazard. It calls attention to a
procedure which, if not correctly performed or adhered
to, could result in damage to
or destruction of the product.
Do not proceed beyond a caution sign until the indicated
conditions are fully understood and met.
WARNING
The warning sign denotes a
hazard. It calls attention to a
procedure which, if not correctly performed or adhered
to, could result in injury or
loss of life. Do not proceed
beyond a warning sign until
the indicated conditions are
fully understood and met.
The instruction manual symbol. The product is marked with this
warning symbol when
it is necessary for the
user to refer to the
instructions in the
manual.
The laser radiation
symbol. This warning
symbol is marked on
products which have a
laser output.
The AC symbol is used
to indicate the
required nature of the
line module input
power.
| The ON symbols are
used to mark the positions of the instrument
power line switch.
❍ The OFF symbols
are used to mark the
positions of the instrument power line
switch.
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This text denotes the
ISM1-A
instrument is an
Industrial Scientific
and Medical Group 1
Class A product.
ii
Contents
1 Getting Started
Introduction 1-2
General Safety Considerations 1-4
Installation 1-5
Returning the Instrument for Service 1-12
2Operation
Introduction 2-2
Front-Panel Features 2-3
Block Diagrams 2-6
To Display a S ignal 2-9
To Compensate for Module Insertion Loss 2-10
Using Probes with an 83491A 2-11
3 Reference
Front-Panel Optical Adapters 3-2
In Case of Difficulty 3-3
Error Messages 3-5
Electrostatic Discharge Infor m ati o n 3-7
Cleaning Connections for Accurate Measurements 3-9
4 Specifications and Regulatory Information
83491A Specifications 4-3
83492A Specifications 4-4
83493A Specifications 4-6
83494A Specifications 4-8
83491/2/3/4A Operating Specifications 4-10
Regulatory Information 4-11
Contents-1
1
Introduction 1-2
General Safety Consider ations 1-4
Installation 1-5
Step 1. Inspect the shipment 1-5
Step 2. Install th e module 1-7
Step 3. Connect the front-panel cables 1-8
Step 4. Connect a modulated signal 1-10
Returning the Instrument for Service 1-12
Contacting Agilen t Technologies 1-12
Getting Started
Getting Started
Introduction
Introduction
Agilent 83491/2/3/4A clock recovery modules are designed to operate in
86100-series infiniium Digital Communications Analyzers (DCA) and 83480A
DCAs. These modules recover clock and data information at standard telecom
and datacom rates. The resulting trigger signal is made available to the DCA
mainframe via a connector located on the module’s rear-panel. An external
front-pane l cable passes the data signal, with some insertion loss, to the
receiver modu le .
Table 1-1.Module Features
Agilent Module Input Connector Selectable Rates (Mb/s)
83491A
83492A
83493A
83494A
83494A Option 106
83494A Option 107
50
Ω electrical
Multimode fiber (62.5/125
Single-mode fiber (9/125
Single-mode fiber (9/125
Single-mode fiber (9/125
Single-mode fiber (9/125
µm)
µm)
µm)
µm)
155, 622, 1060, 1250, 2120, 2488, 2500
155, 622, 1060, 1250, 2120, 2488, 2500
µm)
155, 622, 1250, 2488, 2500
155, 622, 2488, 9953
155, 622, 2488, 2666, 10664
155, 622, 2488, 2666, 10709
WARNI NG Light energy can radiate from the front panel OUTPUT connectors on
83492A, 83493A, and 83494A modules. The light emitted from these
connectors is the slightly attenuated ligh t that is input to the frontpanel INPUT connector.
Online Help On 86100-series infiniium D C As, after installing the module as show n in this
chapter, you’ll find all user documentation (except programming) is located in
the instrument’s Help system. To access the Help system , complete th e installation steps, turn on the 86100C, and click Contents on the Help menu.
1-2
Getting Started
Introduction
83494A Auxiliary
Clock Output
The 83494A module’s front-panel auxiliary clock output provides the recovered clock signal, refer to “Auxiliary outpu ts” on page 2-4. To recover the
clock at data rates greater than 2.5 Gb/s, the DCA mainframe must have one of
the following trigger options installed:
• 86100C Option 001, Enhanced Trigger
• 86100A/B Option 001, Divided Trigger
• 83480A Option 100, Divided Tri g ge r
CAUTION Fiber-optic connectors are easily damaged when connected to dirty or
damaged cables and accessories. The 83492A, 83493A, and 83494A front-panel
input connectors are no exce pti o n. Whe n you use improper cleaning and
handling techniques , y o u ri sk expensive instrume nt repairs, damaged cables,
and compromised measurements. Before you connect any fiber-optic cable to
an 83492A, 83493A, or 83494A modu le, re fe r to “Cleaning Connec tions for
Accurate Measurements” on page 3-9.
CAUTION The circuits on electrical inputs and outputs can be dama g ed by electrostatic
discharge (ESD). Therefore, avoid applying static discharges to any front or
rear-panel electrical connector. Before connecting any coaxial cable to a frontpanel connector, momentarily short the center and outer conductors of the
cable together. Avoid touching the front-panel connectors without first
touching the frame of the instrument. Be sure that the instrument is properly
earth-grounded to prevent buildup of static charge. Refer to “Electros tatic
Discharge Information” on page 3-7.
Figure 1-1. An Agilent 83493A installed in an Agilent83480A mainframe
1-3
Getting Started
General Safety Considera tions
General Safety Considerations
This product has been designed and tested in accordance with the standards
listed on the Manufacturer's Declaration of Conformity, and has been supplied
in a safe condition. The documentation contains information and warni ng s
that must be followed by the user to ensure safe operation and to maintain the
product in a safe condition.
The 83491/2/3/4A modules work only with Agilent digital communication analyzer mainfram es. Refer to the mainframe documentation to ensure safe operation.
WARNI NG Light energy can radiate from the front panel OUTPUT connectors on
83492A, 83493A, and 83494A modules. The light emitted from these
connectors is the slightly attenuated ligh t that is input to the frontpanel INPUT connector.
WARNI NG If this instrument is not used as specified, the protection provided by
the equipment could be impaired. This instrument must be used in a
normal condition (in w hich all means for protection are intact) only.
WARNI NG To prevent electrical shock, disconnect the main frame from mains
before cleaning. Use a dry cloth or one slightly dampened with water
to clean the external case part s. Do not attempt to clean internally.
WARNI NG No operator serviceable parts inside. Refer servicing to qualified
personnel. To prevent electrical shock, do not remove covers.
CAUTION This product i s designed for use in In st allation Category II and Pollutio n
Degree 2 per IEC 10 10 and 664 re s pectively.
CAUTION Electrostatic discharge (ESD) on or near input connectors can damage circuits
inside the instrument. Repair of damage due to misuse is not covered under
warranty. Before connecting any cable to the electrical input, momentarily
short the center and outer conductors of the cable together. Personnel should
be properly grounded, and should touch the frame of the instrument before
touching any connector.
1-4
Getting Started
Installation
Installation
Although some of the figures in the following procedure show an 83480A DCA
mainframe, the procedures equal ly ap ply to installing th e m odule into an
86100-series DCA mainframe.
NOTE If an 83491/2/3/4A module is installed in an 83480A DCA , the DCA s fi rm war e
revision must be A.06.25 or later. If the module is installed in an Agilent 54750A
digitizing oscilloscope, you must first install the Agilent 83480K
communications firmware upgrade kit. To check the Agilent 83480A’ s firmware
revision code, pr ess the Utility key and then the System config softkey. The
firmware revision number is listed under the Frame sec tion of the display.
Step 1. Inspect the shipment
❒ Inspect the shipping container and instrument for damage. Keep the shipping
container and cushioning material until you have inspected the contents of the
shipment for completeness and have checked the instrument mechanically and
electrically.
❒ Locate the shipping list. Verify that you received all the accessories on this list,
and all the options that you ordered. Table 1-2 on page 1-6 shows the external
front-panel cables that are supplied for each module.
❒ Make sure that the serial number listed on the module’s rear-panel label match-
es the serial numbe r listed on the shipping document.
If your shipment is da m a g ed or incomplete, sav e the packing materi a ls and
notify both the shipping carrier and the ne a re st Agilent Technologies service
office. Agilent Technologies will arrange for repair or replacement of damaged
or incomplete shipments without waiting for a settlement from the transportation company. Notify the Agilent Technologies customer engin eer of any problems.
1-5
Getting Started
Installation
Table 1-2.Supplied External Front-Panel Cables
Supplied Cable
a
Agilent Part Number
83491A
RF cable, SMA-SMA, 9.75 cm 83491-20001
RF cable, SMA-SMA, 15.2 cm 83491-20002
83492A
Fiber-optic cable (semi-rigid), multimode, 14 cm 83492-20001
Fiber-optic cable (semi-rigid), multimode, 18.5 cm 83492-20002
83493A
Fiber-optic cable (semi-rigid), single-mode, 14 cm 83493-20001
83494A
Fiber-optic cable (semi-rigid), single-mode, 14 cm 83493-20001
a. Refer to “Step 3. Connect the front-panel cables” on page1-8 for the use of these c ables.
1-6
Getting Started
Installation
Step 2. Install the module
Up to two modules can be inserted into the 86100-series or 83480A DCA mainframe.
1 Install the 83491/2/3/4A module into the left slot on the mainframe. Install in g
the module into the left slot ensures that the supplied adapter cable will fit.
Finger-tighten the knur le d screw on the front panel of the plu g-in module to
ensure that the module is securely seated in the main f ra me.
Figure 1-2. Position of modules in the mainframe
2 Clean all optical interfaces as described in “Cleaning Connections for Accurate
Measurements” on page 3-9, before making measurements.
1-7
Getting Started
Installation
Step 3. Connect the front-panel cables
83491A Module Perform this step if you are installing an 83491A m odul e .
❒ Use the RF cable suppl ied with the module to conn ec t the Electrical Output
connector on the 83 491A to the input on the a dja cent measurement module.
Use the short (83491-20001) or long (83491-20002) cable depending on the location of the input on the adjacent measurement module.
Figure 1-3. The adapter cable
83493/4A Modules Perform the following steps if you are installing an 83493/4A module.
1 Because you’ll connect an FC-PC fiber-optic cable in this procedure, confirm
that the receiver module’s optical input connector has an FC-PC adapter.
Fiber-optic adapters can be removed by hand turning them in the counter-
clockwise direction. Refer to “Front-Panel Optical Adapters” on page 3-2 for a
description of available adapters.
2 If you changed the adapter in step one, you can connect the original adapter to
the 83493/4A module’s front-panel In put connector.
3 Use the FC-PC semi-rigid fiber-optic cable suppl ie d wi th the 83493/4 module
(83493-20001) to connect the Optical Output connector on the 83493/4A to the
input on the receiver module.
83492A Module Perform the following steps if you are instal ling an 83492A module.
1-8
Getting Started
Installation
On 83492A modules, the front-panel fiber-optic connectors reverse input and
output roles depending on the wavelength of the signal. This is shown in
Figure 1-4. Signals in the 750 nm to 860 nm wavelength range are input to the
left connector and output fr om the rig ht connector. Signals in the 1000 nm to
1600 nm wavelength range are input to the ri g ht connector and output from
the left connector.
1 Because you’ll connect an FC-PC fiber-optic cable in this procedure, confirm
that the receiver module’s optical input connector has an FC-PC adapter.
Fiber-optic adapters can be removed by hand turning them in the counter-
clockwise direction. Refer to “Front-Panel Optical Adapters” on page 3-2 for a
description of available adapters.
2 If you changed the adapter in step one, you can connect the original adapter to
the 83493/4A module’s front-panel input connector. See Figure 1-3 to identify
the input connector based on input wavelength.
3 Connect the supplied adapter cable as shown in Figure 1-3. Use the short cable
(83492-20002) when operating at 750 nm to 860 nm wavelengths. Use the long
cable (83492-20001) when operating at 1000 nm to 1600 nm wavelengths.
Figure 1-4. Input and output connections versus wavel ength
1-9
Getting Started
Installation
Step 4. Connect a modulated signal
WARNI NG Light energy can radiate from the front panel OUTPUT connectors on
83492A, 83493A, and 83494A modules. The light emitted from these
connectors is the slightly attenuated ligh t that is input to the frontpanel INPUT connector.
CAUTION 83491A Modules: T o prevent damage to the module, the maximum safe signal
input level is < ±5V. The input circuits can also be damaged by electrostatic
discharge (ESD). Before connecting any coaxial cable to the connectors,
momentarily short the center and outer conductors of the cable together. A void
touching the front-pa ne l input connectors without fir st touching the frame of
the instrument. Be su re that the instrument is p ro p erly earth-grounded to
prevent buildup of static charge.
CAUTION 83492/3/4A Modules: To prevent damage to the module, th e maximum signal
input level is < +3 dBm.
1 Turn on the mainframe and connect a modulated signal to the 83491/2/3/4A
module’s Input connect or.
2 If you are using an 83480A DCA, press the Trigger key and then the Source
softkey. Then, select trigger 2 (the 83491/2/3/4A module) for the trigger source.
3 On the 83491/2/3/4A module, re pe ate dl y press the SELECT key until a front-
panel light indicates the data rate of the signal. Avoid selecting a data rate that
is a multiple of the input signal. For example, don’t select a 622 Mb/s data rate
if the signal is really at 155 Mb/s.
4 Confirm that the Unlocked light is off. If using the 83494A, confirm that the
Trigger Loss light is off. If the UNLOCKED light is on (or TRIGGER LOSS light on the
83494A), clock recovery cannot be establis hed on the signal.
5 Observe the Clock and Data outputs on DCA. Waveforms should be present. The
instrument is now ready for you to begin making measurements. If you cannot
get the clock recovery module to lock on the signal, make sure th at yo u have
selected the correct data rate and that the mainframe trigger level is adjusted
appropriately.
Signals displayed using a data trigger are less reliable than using a recovered
clock. Signals triggered on data can also vary depending upon the trigger level.
1-10
Getting Started
Installation
Green and red data-rate lights
The data-rate indicator lights on the Agilent 83491/2/3A and Agilent 83494A Option 106
change color between red and green to show which data rate is selected. A red light
does not indicate a problem. A red light shows that the adjacent red data rate label is
selected. A green light shows that the adjacent green data rate label is selected.
Repeatedly pressing the SELECT key cycles through the selections in one color before
switching to the opposite color. On Agilent83491A modules for example, the first selection cycle shows 155 Mb/s selected. The second selection cycle shows 1062 Mb/s
selected.
Agilent 83494A modules use only the green data-rate indicator light to show which data
rate is selected. Repeatedly pressing the SELECT key cycles through the available data
rates, as well as the Trigger On Data bypass mode.
Figure 1-5. Front-panel lights
1-11
Getting Started
Returning the Instrument for Servi ce
Returning the Instrument for Service
The instructions in this section show you how to properly return the instrument for repair or calibration. Always call the Agilent Technologies Instrument
Call Center fir st to initiate serv ic e before returning your instrument to a service office. This ensures that the repair (or calibrati on) can be properly
tracked and that your instrument will be returned to you as quickly as possible. Call this number regardless of where you are located.
If the instrument is still unde r warranty or is covered by an Agilen t Technologies maintenance contract, it will be repaired under the terms of the warranty
or contract (the warranty is at the front of this manual). If the instrument is
no longer under warranty or is not covered by an Agilent Technologies maintenance plan, Agilent Technologies will notify you of the cost of the repair after
examining the unit.
When an instrument is returned to a Agilent Technologies service office for
servicing, it must be adequately packaged and have a complete des cri pti on of
the failure sympt o m s a ttached. When describing the failure, please be as sp ecific as possible about the nature of the problem. Include copies of additional
failure information (such as the instrument failure settings, data related to
instrument failure, and error messages) along with the instrument being
returned.
Contacting Agilent Technologies
Call Center For technical assistance, you can contact your local Agilent Call Center.
• In the Americas, call 1 (800) 829-4444
• In other regions, visit http://www.agilent .co m/fin d/assist
Service Center Before returning an instrument for service, you must first call the Agilent
Technologies Instrument Support Center.
• In all regions, call (800) 829-4444
1-12
Getting Started
Returning the Instrument for Service
Preparing the module for shipping
1 Write a complete description of the failure and attach it to the instrument.
Include any specific performance details related to the problem. The following
information should be returned with the instrument.
• Type of ser v ice required.
• Date instrument was returned for repair.
• Description of the problem:
• Whether problem is constant or intermittent.
• Whether instrument is temperature-sensitive.
• Wheth er instrument is vibr a tion-sensitive.
• Instrument settings require d to reproduce the problem.
• Performance data.
• Company name and return address.
• Name and phone number of technical contact perso n.
• Model number of returned instrument.
• Full serial number of returned instrument.
• List of any accessories returned with instrument.
2 Cover all front or rear-panel connectors that were originally covered when you
first received the instrument.
CAUTION Cover electrical connectors to protect sensitive components from electrostatic
damage. Cover optical connectors to protect them from damage due to physical
contact or dust.
CAUTION Instrument damage can result from using packaging materials other than the
original materials. Never use styrene pellets as packaging material. They do not
adequately cus hion the instrument or prevent it from shift ing in the carton.
They may also cause instrument damage by generating static electricity.
3 Pack the instrument in the original shipping containers. Original materials are
available through any Agilent Technologies office. Or, use the following
guidelines:
• Wrap the instrument in antistatic plastic to reduce the possibility of damage
caused by electrostatic discharge.
• For instruments weighing less than 54 kg (120 lb), use a double-walled, cor-
rugated cardboard carton of 159 kg (350 lb) test strength.
• The carton must be large enough to allow approximately 7 cm (3 inches) on
1-13
Getting Started
Returning the Instrument for Servi ce
all sides of the instrument for packing material, and strong enough to accommodate the weight of the instrument.
• Surround the equipment with approximately 7 cm (3 inches) of packing material, to protect the instrument and prevent it from moving in the carton. If
packing foam is not available, the best alternative is S.D-240 Air Cap™ from
Sealed Air Corporation (Commerce, Califor nia 900 01). Air Cap look s like a
plastic sheet filled with air bubbl es . U se the pink (antistati c ) Air Cap™ to
reduce static ele ctricity. Wrapping the instrument sev eral times in this material will protect the instrument and prevent it from moving in the carton.
4 Seal the carton with strong nylon adhesive tape.
5 Mark the carton “FRAGILE, HANDLE WITH CARE”.
6 Retain copies of all shipping papers.
1-14
2
Introduction 2-2
Front-Panel Features 2-3
Block Diagra m s 2-6
To Display a S ignal 2-9
To Compensate for Module Insertion Loss 2-10
Using Probes with an 83491A 2-11
Operation
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