Agilent Technologies 100 User manual

User’s Guide
Publication number E2625-97001
January 2000
For Safety information, Warranties, and Regulatory information, see the pages
at the end of this manual.
© Copyright Agilent Technologies 1999-2000
All Rights Reserved
Infiniium Option 100 and
E2625A Telecommunications
Mask Template Kit

ii
In This Book
This Telecommunications Mask Template Kit User’s Guide contains the
following information:
Introduction to Option 100 and E2625A Telecommunications Mask
Template Kit
Chapter 1 introduces specific product information about the Mask Template
Kit. It also discusses the recommended oscilloscope configuration, and shows
an overview of the Mask Test Setup dialog box.
Getting Started and Using Masks
Chapter 2 describes Mask Testing and shows you ways to use the standard masks
to verify compliance of your instrument waveforms.
Standard Masks
Chapter 3 lists file names for the standard masks in the Telecommunications
Mask Template Kit, along with line impedances and bit rates. The templates
for each standard mask are also shown.

Contents
Contents-1
1 Introduction to Option 100 and E2625A Telecommunications
Mask Template Kit
Adding Option 100 to an existing Infiniium Oscilloscope 1-2
Supplied items 1-3
Recommended accessories 1-3
Things to know 1-4
What not to do 1-4
Oscilloscope models 1-4
To access the Mask Test Setup dialog box 1-5
Overview of the Mask Test Setup dialog box 1-6
2 Getting Started and Using Masks
Introduction to Mask Testing 2-2
Make a copy of the Mask Test disk 2-3
To install the Standard Masks 2-4
To calibrate the oscilloscope 2-5
To choose a proper probe for Mask Testing 2-6
To get your waveform on the oscilloscope display 2-7
To enable the Mask Test 2-8
To load a Mask 2-9
To align a Mask to the waveform 2-10
To start and stop the Mask Test 2-11
To understand the Mask Test tab description area 2-12
To run the Mask Test conditionally 2-13
To stop the Mask Test on the first failure 2-14
3 Standard Masks
ITU G.703 International Standard Masks 3-4
ANSI T1.102 North American Standard Masks 3-11
FCC Part 68.308 Options A, B, and C Masks 3-17
Pre-Compliance SONET Masks 3-19
IEEE 802.3 Masks 3-21

1
Introduction to Option 100 and E2625A
Telecommunications Mask Template
Kit

1- 2
Introduction to Option 100 and E2625A
Telecommunications Mask Template Kit
The Infiniium Oscilloscopes Option 100 Telecommunications Mask
Template Kit includes the materials necessary for you to verify that your
instrument waveforms comply with industry standards. Option 100
provides a quick method for you to certify waveform integrity during
early development and later during manufacturing tests.
This manual helps you use the standard masks supplied with Option 100.
It shows you how to load standard waveform masks into Infiniium
Oscilloscopes and use them to test the compliance of your waveforms.
All of the standard masks supplied are shown in Chapter 3.
Adding Option 100 to an existing Infiniium Oscilloscope
The Option 100 Telecommunications Mask Template Kit is orderable as
E2625A for customers who already have an Infiniium Oscilloscope.
Adding E2625A to any Infiniium Oscilloscope requires that you upgrade
the Infiniium application software to Version A.03.00 or later.

1-3
Introduction to Option 100 and E2625A Telecommunications Mask Template Kit
Supplied items
Supplied items
The Option 100 Telecommunications Mask Template Kit contains the
following items:
Recommended accessories
Other Agilent accessories recommended for use in mask testing include:
Mask Template
Kit Item
Description Separately Orderable
Agilent Part Number
Floppy disk Mask template library floppy disk
(Requires Version A.03.00 software or later.)
E2626A
Adapter 100/110/120 Ωdifferential impedance adapter
with bantam (f) connector, bantam (m) to
Siemens (f) adapter cable
E2621A
Adapter cable Bantam (m) to Siemens (f) adapter cable E2623A
Adapter 75 Ωsingle-ended impedance adapter with
BNC (f) connector
E2622A
Adapter cable Dual-bantam (f) to RJ48C (m) adapter cable E2624A
Adapter/coupler RJ48C (f) to RJ48C (f) E2627A
Adapter Bantam (m) to BNC (f); for system verification of
E2621A adapter and Infiniium oscilloscope
E2628A
Adapter BNC (m) to BNC (f) 50-to-75 ohm adapter; for
system verification of E2622A adapter and Infiniium
oscilloscope
E2629A
Cable BNC (m) to BNC (m) cable; 30 cm long 8120-1838
Storage case Hard-shell case for storage of all kit accessories E2625-45501
Agilent Part
Number
Accessory Item Description
E2630A Patch cable Bantam (m) to bantam (m) patch cable
E2632A Patch cable Siemens (m) to Siemens (m) patch cable

1- 4
Introduction to Option 100 and E2625A Telecommunications Mask Template Kit
Things to know
Things to know
If you are adding the Mask Test capability to an Infiniium Oscilloscope,
make sure that the system software is upgraded to Version A.03.00 or
later.
After installing a new version of system software, you should recalibrate
the oscilloscope. Calibrating the oscilloscope is explained in Chapter 2.
Standard masks supplied are shown in Chapter 3, including file names
and templates.
What not to do
You should not use the Mask Test master disk for daily use. Instead, you
should use a copy of the master disk, as described in Chapter 2.
Oscilloscope models
You can use the Telecommunications Mask Template Kit with these
Infiniium Oscilloscopes:
Agilent Model Channels Bandwidth Sample Rate Memory Depth
54810A 2 500 MHz 1 GSa/s 32k
54815A 4 500 MHz 1 GSa/s 32k
54820A 2 500 MHz 2 GSa/s 32k
54825A 4 500 MHz 2 GSa/s 32k
54835A 4 1.5 GHz 2 GSa/s — 4 ch
4 GSa/s — 2 ch
32k — 4 ch
64k — 2 ch
54845A 4 1.5 GHz 4 GSa/s — 4 ch
8 GSa/s — 2 ch
32k — 4 ch
64k — 2 ch

1-5
Introduction to Option 100 and E2625A Telecommunications Mask Template Kit
To access the Mask Test Setup dialog box
To access the Mask Test Setup dialog box
Select Analyze, then Mask Test... from the oscilloscope main menu, as shown
here, to access the Mask Test Setup dialog box:

1- 6
Introduction to Option 100 and E2625A Telecommunications Mask Template Kit
Overview of the Mask Test Setup dialog box
Overview of the Mask Test Setup dialog box
You will use the Mask Test Setup dialog box shown here to load and use
masks with the Infiniium Oscilloscope. Standard masks are shown in
Chapter 3. How to load and use a mask is described in Chapter 2.
Checkmark to
enable the
Mask Test.
Mask Test Setup
Dialog Box
Click to load a
Mask.
Click to align or
clear a Mask.
See the Infiniium help system to
use Scaling and Automask.
A Mask Test tab
will appear
when the
Mask Test
is enabled.
Click to start
and stop the
Mask Test.
Conditionallyrun
the Mask Test
and stop on the
first failure.
Checkoptions to invert a
mask, use the file setup
when aligning a mask, or
enable averaging to
reduce noise.

2
Getting Started and Using Masks

2- 2
Getting Started and Using Masks
Telecommunications (telecom) and data communications (datacom)
industries have established standards for equipment manufacturers.
One of these standards defines the electrical parameters for waveforms.
By applying these standards, both telecom and datacom equipment
manufacturers can ensure that their equipment will operate properly
together by first certifying waveform integrity.
To verify waveform integrity during the equipment manufacturing
phase, Infiniium Oscilloscopes have a feature called Mask Testing.
Within seconds, you know whether your equipment’s waveform complies
with the industry standard.
Introduction to Mask Testing
What is a Mask?
A mask is a template that you load into the oscilloscope used during mask
testing. The mask shows the acceptable electrical parameters of a waveform
by defining regions of the oscilloscope display where the waveform must not
intersect. If the waveform crosses the boundary of a region of the mask, it fails
the mask test.
The types of masks that you can use to test waveforms include:
• Industry standard masks
Industry standard masks are included in this Mask Template Kit.
• Automatically generated masks
• User-defined masks
When to use Mask Testing
You should use mask testing whenever your waveform must conform to an
industry standard. You can do mask testing during manufacturing to ensure
that your design meets the requirements of the telecom or datacom industries.

2-3
Getting Started and Using Masks
Make a copy of the Mask Test disk
How Infiniium does Mask Testing
When you start the mask test, Infiniium creates a database that has unique
locations for every pixel in the waveform viewing area. Each location in the
database has a 21-bit counter for a maximum count of 2,097,151.
Each time a data point from a channel memory illuminates a pixel in the
waveform viewing area, the counter for that pixel is incremented. During mask
testing, any data point that illuminates a pixel in the mask violation region
causes a mask test failure.
The oscilloscope’s database continues to build until the oscilloscope stops
acquiring data or until mask testing is deactivated.
The oscilloscope’s database is also used for histogram analysis and color grade
persistence. Refer to the Infiniium help system for detailed information about
these other waveform analysis features.
How to do Mask Testing
The remaining topics in this chapter show you how to do mask testing.
Chapter 3 shows the standard masks supplied in the Mask Template Kit.
Make a copy of the Mask Test disk
A disk containing the standard masks is shipped with Infiniium Option 100 and
E2625A. Before you install the Mask Test templates, you should make a copy
of the Mask Test master disk and use the copy of the Mask Test disk for the
installation.

2- 4
Getting Started and Using Masks
To install the Standard Masks
To install the Standard Masks
Use the copy of the Mask Test disk to install standard masks onto the Infiniium
hard drive. The Mask Test disk contains many of the available standard masks
that you may need to use during mask testing.
1Insert the copy of the Mask Test disk in the floppy drive.
2From the oscilloscope main menu, select Analyze, then Mask Test.
3In the Mask Test Setup dialog box, select the Enable Mask Test control.
4In the Mask Test Setup dialog box, click the Load Mask... button.
The Load Mask dialog box will resemble:
5Click the Install Masks from A: button.
This selects the disk
where the masks
are installed.
This selects the
directory where the
masks are installed.

2-5
Getting Started and Using Masks
To calibrate the oscilloscope
To calibrate the oscilloscope
Your Infiniium should be at optimum performance when performing mask
testing. If your Infiniium has not been calibrated in the last year or if the
Calibration ∆Temp is greater than ±5 °C, you should recalibrate the oscilloscope
before performing a mask test. You can find the Calibration ∆Temp in the
Calibration dialog box by clicking on the Utilities menu and selecting Calibration.
1Make sure Infiniium has warmed up for at least 30 minutes.
2From the oscilloscope main menu click Utilities, then Calibration.
3Make sure that the Cal Memory Protect check box is unchecked.
4Click Start.
Infiniium will display additional instructions and guide you through the step-
by-step calibration procedure.
Use a High-Quality Cable
When calibrating the oscilloscope, use a short, high-quality BNC-to-BNC coaxial
cable, such as the 8120-1838 cable.
Cal Memory Protect This option protects the oscilloscope’s calibration factors from
accidentally being changed.
Details When checked, this option displays a list of anything that has failed
during the calibration. You can use the failure information to helprepair
the oscilloscope.

2- 6
Getting Started and Using Masks
To choose a proper probe for Mask Testing
To choose a proper probe for Mask Testing
You can use any oscilloscope probe that fits your application. Depending on the
type of waveform you are testing, you may need to use one of the probe adapters.
Calibrating the probe adapter
Depending on the requirements of your Telecom or Datacom industrial
standard, you may need to use the E2622A 75 Ωprobe adapter or the E2621A
differential probe adaptor. Before performing a mask test, you should calibrate
the probe adapter using the following instructions:
1In the Channel Setup dialog box, click the Probes... button.
2In the Probes Setup dialog box, click the Calibration... button.
3Follow the step-by-step instructions to calibrate the probe.

2-7
Getting Started and Using Masks
To get your waveform on the oscilloscope display
To get your waveform on the oscilloscope display
When doing mask testing, you will try to fit the mask to your waveform. This
is how you will verify whether your waveform meets the acceptable electrical
parameters defined by the standard mask. By having your waveform displayed
on the oscilloscope screen before doing mask testing, when you load and use
the mask, you will know immediately if the waveform passes the mask test.
1Display the waveform you want to test on the oscilloscope screen.
2Begin mask testing using a standard mask, as described in the following
topics.

2- 8
Getting Started and Using Masks
To enable the Mask Test
To enable the Mask Test
1Click Analyze, then Mask Test to access the Mask Test Setup dialog box.
2In the Mask Test Setup dialog box, click Enable Mask Test to checkmark
the box.
When enabled, a Mask Test tab appears beneath the waveform viewing area.
Checkmark
to enable the
Mask Test.

2-9
Getting Started and Using Masks
To load a Mask
To load a Mask
1Click Analyze, then Mask Test to access the Mask Test Setup dialog box.
2Make sure the mask test is enabled.
3Click the Load Mask... button.
4In the Load Mask dialog box, click the Mask Test Source field to select an
oscilloscope channel for the mask test. The active channel is the
default.
5Click the Drive: field and select the drive where the mask you want to
load is located. In the List files of type: field, Mask Files will be displayed
by default.
6To load a standard mask from the Infiniium hard drive, make sure the
Folder: shows c:\scope\masks. Then view the list of standard masks by
scrolling them in the Files: field.
7When you find the standard mask that you want to load, double-click
the file in the Files: field. The mask file name will be entered and
highlighted in the File name: field, and Infiniium will load the mask.
Chapter 3 lists the standard mask file names and shows the mask waveforms.

2- 10
Getting Started and Using Masks
To align a Mask to the waveform
To align a Mask to the waveform
1Access the Mask Test Setup dialog box and make sure the mask test is
enabled.
2Locate the Use File Setup When Aligning option.
When aligning a mask to the waveform, these settings are used:
• Channel range and offset
• Time base range and position
• Trigger mode and level
• Mask test scaling source, position(s), and delay
You can either use the current oscilloscope settings, or you can use the standard
settings defined in the mask file.
3If you want to use the standard settings defined in the mask file,
checkmark the Use File Setup When Aligning option.
4If you want to use the current oscilloscope settings, do not checkmark
this box.
5Click the Align button to align the mask.
When aligning a
mask, you can use
the current settings
for the oscilloscope
setup, or use the
standard settings in
the mask file.