Tektronix TDS3TMT User manual

User Manual
TDS3TMT
Telecom Mask Test
Application Module
071-0648-02
*P071064802*
071064802

Copyright ETektronix. All rights reserved. Licensed software
products are owned by Tektronix or its subsidiaries or suppliers,
and are protected by national copyright laws and international
treaty provisions.
Tektronix products are covered by U.S. and foreign patents,
issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and
price change privileges reserved.
TEKTRONIX, TEK, TEKPROBE, and TekSecure are registered
trademarks of Tektronix, Inc.
DPX, WaveAlert, and e*Scope are trademarks of
Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O. Box 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
HIn North America, call 1-800-833-9200.
HWorldwide, visit www.tektronix.com to find contacts in
your area.

1
Contents
Safety Summary 2.............................
Installing the TDS3TMT Application Module 5........
Telecom Mask Test Features 5...................
Accessing TDS3TMT: QuickMenu 6................
Accessing TDS3TMT: Utility Menu 7...............
Conventions 8...............................
TDS3TMT Menu 9.............................
Telecom Pass/Fail Mask Test Example 24............

2
Safety Summary
To avoid potential hazards, use this product only as
specified. While using this product, you may need to
access other parts of the system. Read the General Safety
Summary in other system manuals for warnings and
cautions related to operating the system.
Preventing Electrostatic Damage
CAUTION. Electrostatic discharge (ESD) can
damage components in the oscilloscope and its
accessories. To prevent ESD, observe these
precautions when directed to do so.
Use a Ground Strap. Wear a grounded antistatic wrist strap
to discharge the static voltage from your body while
installing or removing sensitive components.
UseaSafeWorkArea.Do not use any devices capable of
generating or holding a static charge in the work area
where you install or remove sensitive components.
Avoid handling sensitive components in areas that have a
floor or benchtop surface capable of generating a static
charge.

3
Handle Components Carefully. Do not slide sensitive
components over any surface. Do not touch exposed
connector pins. Handle sensitive components as little as
possible.
Transport and Store Carefully. Transport and store sensitive
components in a static-protected bag or container.
Manual Storage
The oscilloscope front cover has a convenient place to
store this manual.

4

5
Installing the TDS3TMT Application Module
Refer to the TDS3000, TDS3000B, and TDS3000C
Series Application Module Installation manual for
instructions on installing and testing the application
module.
Telecom Mask Test Features
The TDS3TMT application module adds waveform
mask testing capabilities to your oscilloscope. This
section provides an overview of these additional features.
Telecom Mask Test QuickMenu
Use the telecom mask test QuickMenu function to
display bottom and side menus that provide access to all
key mask test functions from one screen.
Predefined Telecom Industry Masks
The TDS3TMT application module provides compliance
masks for testing to ITU-G.703 and ANSI T1.102
telecommunications standards, up to STS-1 (52 Mb/s)
line rates.
Multiple Channel Testing
The TDS3TMT application module enables you to
perform multiple simultaneous testing on all active
oscilloscope channels.

6
Test Automation
You can connect the oscilloscope to do automated mask
testing by using the RS--232, GPIB, or LAN commu-
nication ports.
Accessing TDS3TMT: QuickMenu
1. Push the QuickMenu front-panel button to display
the quick menu items.
2. Push the Menu bottom screen button to select and
display the Telecom bottom and side menu items.
3. Push bottom and side menu buttons to select a mask,
set test control parameters, and test pass/fail
responses.

7
Accessing TDS3TMT: Utility Menu
1. Push the UTILITY front-panel button to display the
utility menu items.
2. Push the System bottom screen button to display
Apps.
3. Push the Module bottom screen button to select
Telecom. The screen displays the telecom bottom and
side menu items.
4. Push bottom and side menu buttons to select a mask,
set test control parameters, and test pass/fail
responses.

8
Conventions
The following conventions apply to all TDS3TMT
functions:
HYou can perform multiple waveform mask testing by
connecting signals to all oscilloscope input channels.
HWhile in Telecom Mask test mode, the AUTOSET
front-panel button automatically sets the oscilloscope
horizontal, vertical, and trigger parameters, and
positions the waveform in the selected mask.
HMask testing only works with live channels. It is
recommended that you turn off math and reference
waveforms while doing mask testing.

9
TDS3TMT Menu
Table 1: Utility Menu: Type = Apps, Module = Telecom
Bottom Side Description
Mask-
Type
(ITU-T)
None (Off)
DS-0 Single 64 kb/s
DS-0 Double 64 kb/s
DS-0 Data Contra-
directional 64 kb/s
DS-0 Timing 64 kb/s
Old ”DS1” Rate
1.544 Mb/s
G.703 DS1
1.544 Mb/s
E1 Symetric Pair
2.048 Mb/s
E1 Coaxial Pair
2.048 Mb/s
Clk Interface Symetric
Pair 2.048 Mb/s
Clk Interface Coaxial
Pair 2.048 Mb/s
”DS2” Rate Symetric
Pair 6.312 Mb/s
”DS2” Rate Coaxial
Pair 6.312 Mb/s
E2 8.448 Mb/s
32.064 Mb/s
E3 34.368 Mb/s
Old ”DS3” Rate
44.736 Mb/s
G.703 DS3
44.736 Mb/s
ITU-T standard masks. Each
mask sets the oscilloscope
vertical, horizontal, and
trigger controls to acquire
that standard’s waveform.
After selecting a standard,
push the AUTOSET front-
panel button to position the
waveform in the mask.
The oscilloscope is set to
edge trigger on waveforms
(per ITU-T G.703 standard).

10
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Mask
Type
(T1.102)
None (Off)
DS1 1.544 Mb/s
DS1A 2.048 Mb/s
DS1C 3.152 Mb/s
DS2 6.312 Mb/s
DS3 44.736 Mb/s
STS-1 Pulse
51.84 Mb/s
ANSI T1.102 standard
masks. Each mask sets the
oscilloscope vertical, hori-
zontal, and trigger controls to
acquire that standard’s
waveform.
Mask None (Off) Turns off user mask.
M
a
s
k
Type
(Custom) User Mask Sets the oscilloscope to use
the User mask.
Copy Std Mask To
User Mask
Copies the selected ITU-T or
T1.102 mask into the User
mask. Use the general pur-
pose knob to select the
standard mask to load.
Save/Recall User
Mask
Saves or recalls User
masks.

11
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Current
Mask
Status area that displays the
name of the currently se-
lected mask.
Mask
Control
Highlight Violations
On Off
Turnsonmaskviolation
highlighting. Waveforms that
violate mask parameters
leave highlighted points on
the mask that are the color
of the failing waveform.
Stop On Violation
On Off
When set to On, the oscillo-
scope stops mask testing on
the first occurrence of a
waveform violation. This
function overrules pass/fail
tests.
Lock Mask To
Waveform
On Off
Locks mask to waveform so
that the mask segments
move and redraw proportion-
ally when changing the
horizontal or vertical scale or
position settings.
Autofit Search Radius Autofit repositions the wave-
form using a spiral algorithm
to attempt to fit the wave-
form to a mask.

12
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Mask
Control
Vertical Margin
Percentage
(
U
s
e
r
m
a
s
k
o
n
l
y
)
When enabled, adjusts the
User mask vertical margins
a
s
a
p
e
r
c
e
n
t
o
f
t
h
e
n
o
m
i
n
a
l
(
User mask onl
y
) as a percent o
f
the nominal
waveform amplitude for the
mask standard.
Pass/
Fail
Mask
Pass/Fail Mask Test
On Off
When set to On, resets the
status information and starts
mask testing.
M
a
s
k
Tes t Status: Displays pass/fail test status
information: the number of
waveforms that have violated
the mask per number of
waveforms tested in the
current test, and the number
of failed tests per the total
number of tests run (if Re-
peat on Completion is On).
If the number of waveforms
that fail exceeds the violation
threshold setting, status text
changes from Passing to
Failing.

13
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Pass/
Fail
Mask
T
e
s
t
Repeat On
Completion
On Off
When set to On, repeats the
pass/fail test cycle using the
current settings. The status
a
r
e
a
F
a
i
l
u
r
e
s
/
T
e
s
t
v
a
l
u
e
s
Tes t
(cont.)
area Failures/
T
est
v
alues
show how many times the
test has repeated and how
many of those tests failed.
Number Of
Waveforms
Sets the number of wave-
forms to acquire for each
pass/fail test cycle. Use the
general purpose knob to set
the value. Any value above
100,000 sets the waveform
count to infinity.
If waveform averaging is on,
the actual number of wave-
forms acquired is the Num-
ber Of Waveforms value
times the waveform averag-
ing value.

14
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Pass/
Fail
Mask
Tes t
Violation Threshold
For Failure
Sets how many failed wave-
forms define a failed test.
Use the general purpose
knob to set the value.
T
e
s
t
(cont.) Pre-Test Delay Sets a time value that delays
the start of a pass/fail test.
Use the general purpose
knob to set the value.
Polarity Sets the polarity of all active
waveform channels. Values
are positive, negative, or
both. If set to Both, the
oscilloscope tests the first
half of all active channel
acquired waveforms in nor-
mal (uninverted) mode, and
then inverts all active chan-
nels and tests the second
half of acquired waveforms.
Beep On Completion
On Off
When On, causes the oscil-
loscope to emit a tone when
the pass/fail test is complete.
Beep On Failure
On Off
When On, causes the oscil-
loscope to emit a tone when
the pass/fail test status
changes from Passing to
Failing.

15
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Pass/
Fail
Mask
Tes t
(cont.)
Hard Copy On Failure
On Off
When On, causes the oscil-
loscope to send the screen
image to the hard copy
device when the pass/fail
test status changes from
Passing to Failing.
Save Failed Wfm To
Disk
On Off
When On, saves the failing
signal waveform(s) data to
the oscilloscope media drive
when the mask test fails.
Show
Results
Count Hits
On Off
When On, displays the
number of mask hits (fail-
ures) per channel and per
mask segment. Enabling
count hits slows down the
mask test rate; if mask test
speed is important, turn
Count Hits Off.

16
Table 1: Utility Menu: Type = Apps, Module = Telecom (cont.)
Bottom DescriptionSide
Show
Results
Violations/
Waveforms, ...
Displays pass/fail test status
information: the number of
waveforms that have violated
the mask per number of
w
a
v
e
f
o
r
m
s
t
e
s
t
e
d
i
n
t
h
e
wa
v
e
f
orms tested in the
current test, and the number
of failed tests per the total
number of tests run (if Re-
peat is On).
Segment 1 Hits
...
Segment 8 Hits
Status area that displays the
number of hits for each
channel on each mask seg-
ment.
Mask Testing and Pass/Fail Testing. Mask testing
means the detection and highlighting of mask segment
violations. Pass/Fail testing is setting conditions for mask
testing, such as the number of waveforms to test, how
many mask violations are allowed before failing a test,
whether to repeat testing upon completion, what action
to perform at the completion of a test, and so on.
Turn Off Mask Testing. To turn off mask testing and
remove the mask from the screen, set the mask standard
to None.

17
Standards and Pulse Amplitudes. For those cases
where a mask standard defines a valid pulse amplitude as
being within a range of values, the TDS3TMT mask is
drawn for the maximum permitted amplitude.
For those cases where a mask standard does not define
pulse amplitude, the TDS3TMT mask is drawn for a
nominal 1 V pulse.
Highlight Violations. Highlight Violations must be on in
order for the oscilloscope to perform mask comparisons.
If Highlight Violations is off, the oscilloscope will not
inform you of mask violations using highlighting or the
Stop On Violation command, and hits counting will not
count. Also, turning on pass/fail testing, Count Hits, or
Stop on Violation automatically turns on Highlight
Violations.
Pass/Fail Testing: Averaging. When averaging is on,
the oscilloscope first generates an averaged waveform,
then the averaged waveform is compared to the mask.
This means that the total number of waveforms acquired
is equal to the waveform averaging number times the
number of waveforms being tested. For example, if
pass/fail Number of Waveforms is set to 500, and
waveform averaging is set to 8, then the total number of
waveforms acquired for one pass/fail test cycle is
500x8=4,000.

18
Saving Waveforms to Disk. The default saved file name
is TEKnnnnn.fff, where nnnnn is an incrementing
number that usually starts at 00000, and fff is the file
format (Internal, Spreadsheet, or Mathcad file format) as
set in the SAVE/RECALL > Save Waveform to File
menu. For internal file format waveforms (.isf), if more
than one waveform is being tested, look at the .isf file
preamble information at the top of the file to determine
from which channel that waveform data came. Refer to
the TDS3000, TDS3000B, and TDS3000C Series
Programmer Manual for .isf file format information.
Proper Signal Termination. Make sure to correctly
terminate communication test signals. Tektronix offers
optional AMT75 adapters for correct communication
signal termination.
Pass/Fail Testing: Polarity. When polarity is set to both,
the oscilloscope tests the first half of all active channel
acquired waveforms with positive polarity, and then
inverts all active channels and tests the second half of
acquired waveforms.
Stop On Violation. If Stop On Violation is On, the
pass/fail status area displays Violation if there is a
violation, regardless of the pass/fail test settings. In other
words, Stop On Violation has a higher precedence than
pass/fail tests.