Find It - Fluke Networks
TM
DSP-FTA420/30/40
Fiber Test Adapter
Users Manual
English
PN 1570398
July 2000
© 2000 Fluke Networks. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship
under normal use and service. The warranty period is one year and begins on the date of
shipment. Parts, product repairs, and services are warranted for 90 days. This warranty
extends only to the original buyer or end-user customer of a Fluke authorized reseller,
and does not apply to fuses, disposable batteries, or to any product which, in Fluke’s
opinion, has been misused, altered, neglected, contaminated, or damaged by accident or
abnormal conditions of operation or handling. Fluke warrants that software will operate
substantially in accordance with its functional specifications for 90 days and that it has
been properly recorded on non-defective media. Fluke does not warrant that software will
be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to
end-user customers only but have no authority to extend a greater or different warranty
on behalf of Fluke. Warranty support is available only if product is purchased through a
Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke
reserves the right to invoice Buyer for importation costs of repair/replacement parts when
product purchased in one country is submitted for repair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price,
free of charge repair, or replacement of a defective product which is returned to a Fluke
authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a
description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke
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INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF
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Since some countries or states do not allow limitation of the term of an implied warranty,
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Fluke Networks
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
11/99
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
Table of Contents
Title
Introduction ..........................................................................................
Unpacking ............................................................................................
Safety Information................................................................................
Fiber Test Adapter Features .................................................................
Getting Started......................................................................................
Cleaning the Fiber Connections .......................................................
Verifying Operation..........................................................................
Summary of Fiber Test Settings ...........................................................
Setting Up for Fiber Tests ....................................................................
Selecting a Test Standard and Fiber Type ........................................
Setting the Remote End Configuration.............................................
Selecting the Adapter Type ..............................................................
Setting the Number of Adapters and Splices ....................................
Setting a Reference...........................................................................
Setting a Reference for Smart Remote Mode ...................................
Setting a Reference for Loopback Mode ..........................................
Setting a Reference for Far End Source Mode .................................
Changing the Index of Refraction.....................................................
Running an Autotest.............................................................................
Saving Autotest Results........................................................................
Autotest Results for Smart Remote Mode ............................................
Pass/Fail and Headroom Results for Smart Remote Mode ...............
Loss for Smart Remote Mode...........................................................
Length Results for Smart Remote Mode ..........................................
Bi-Directional Testing ..........................................................................
Swapping Connections .....................................................................
Bi-Directional Autotest Results........................................................
Autotest Results for Loopback Mode ...................................................
Pass/Fail and Headroom Results for Loopback Mode......................
Loss Results for Loopback Mode .....................................................
Length Results for Loopback Mode .................................................
i
Page
1
2
3
4
5
6
6
8
9
9
10
10
11
11
12
14
15
16
16
21
22
22
22
24
25
25
25
26
26
26
27
Contents (continued)
Autotest Results for Far End Source Mode...........................................
Single Tests...........................................................................................
Single Tests for Smart Remote Mode ...............................................
Single Tests for Loopback Mode ......................................................
Single Test for Far End Source Mode...............................................
Monitoring Optical Power ....................................................................
Using the Talk Mode ............................................................................
™
Using the FindFiber Feature .............................................................
Configuring a Custom Fiber Test..........................................................
Fiber Test Reports.................................................................................
Maintenance..........................................................................................
Calibration ........................................................................................
Repair................................................................................................
Contacting Fluke Networks ..................................................................
Replacement Parts and Accessories ......................................................
Specifications........................................................................................
General Specifications ......................................................................
Optical Transmitter ...........................................................................
Optical Receiver................................................................................
Fiber Troubleshooting Guide................................................................
Glossary ................................................................................................
Index
ii
28
30
30
31
31
32
34
34
38
39
39
40
40
40
40
42
42
42
43
45
47
List of Tables
Table
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Title
Settings for Testing Fiber...................................................................
Loss Results for Smart Remote Mode................................................
Length Results for Smart Remote Mode............................................
Loss Results for Loopback Mode ......................................................
Length Results for Loopback Mode...................................................
Loss Results for Far End Source Mode .............................................
Main Unit Results for the FindFiber Test (Smart Remote Mode .......
Smart Remote LED Results for the FindFiber Test ...........................
Replacement Parts and Accessories ...................................................
Common Problems in Fiber Links .....................................................
iii
Page
8
23
24
27
27
29
35
35
41
46
Contents (continued)
iv
List of Figures
Figure
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Title
Standard Equipment...........................................................................
Features of the DSP-FTA4XX Fiber Test Adapter ............................
Attaching a DSP-FTA4XX ................................................................
Connections for a Self Test................................................................
Setting a Reference for Smart Remote Mode.....................................
Setting a Reference for Loopback Testing .........................................
Setting a Reference for Far End Source Mode...................................
Test Connections for Smart Remote Mode ........................................
Test Connections for Loopback Mode...............................................
Test Connections for Far End Source Mode ......................................
Monitoring Optical Power .................................................................
Using FindFiber with a Smart Remote...............................................
Using FindFiber with a Loopback Cable ...........................................
v
Page
2
4
5
7
13
14
15
18
19
20
33
36
37
Contents (continued)
vi
Introduction
The DSP-FTA420/30/40 Fiber Test Adapters (hereafter referred to as the DSPFTA4XX) lets you use a DSP-4000 CableAnalyzer test tool to test and
certify fiber optic cable installations. The fiber test adapter includes the
following features:
•
Autotest function measures optical power loss and length on dual-fiber
multimode (DSP-FTA420/440) and singlemode (DSP-FTA430) links.
Provides pass/fail results based on common fiber test standards.
•
Includes built-in support for SFF (Small Form Factor) link testing.
•
Monitors power at 850 nm, 1300 nm, 1310 nm, and 1550 nm from optical
sources, such as test equipment and optical interface cards.
•
Transmits or receives light for performing quick continuity checks.
•
Graphic Help screens show you how to make the proper fiber
connections.
•
FindFiber™ feature helps you verify optical connectivity.
•
Allows two-way voice communication over the fiber under test (using a
pair of the same model DSP-FTA4XX units and the headsets supplied with
the DSP-4000 test tool).
•
Saves fiber test results for printing or uploading to a PC.
Note
When reading this manual, DSP-FTA4XXS refers to a set of two
adapters with identical model numbers.
DSP-FTA4XX refers to a single adapter. When referring to only
specific model number, that model number is given in full, e.g. DSPFTA420S or DSP-FTA420.
1
DSP-FTA420/30/40
Users Manual
Unpacking
The DSP-FTA4XXS Fiber Test Option Set includes the following items, which
are shown in Figure 1:
•
Two DSP-FTA4XX Fiber Test Adapters
•
Two ST/ST adapters
•
•
Four SC/ST patch cords
FTA-420 – 62.5 µm multimode
FTA-430 - singlemode
FTA-440 – 50.0 µm multimode
Two ST/ST patch cords
FTA-420 – 62.5 µm multimode
FTA-430 - singlemode
FTA-440 – 50.0 µm multimode
DSP-FTA4XX Users Manual (not shown)
•
Warranty registration card (not shown).
•
If anything is damaged or missing, contact the place of purchase immediately.
DSP-FTA4XX (2)
IN
OU
TP
PU
T
UT
ST/ST Adapters (2)
ST/ST
Patch Cords (2)
SC/ST
Patch Cords (4)
agp14f.eps
Figure 1. Standard Equipment
2
Fiber Test Adapter
Safety Information
Safety Information
*WWarning
To avoid possible eye damage caused by hazardous
radiation:
•
Never look directly into optical output connectors (see
Figure 2). Some sources produce invisible radiation
that can permanently damage your eyes.
•
Do not open the case; no user-serviceable parts are
inside.
•
Do not modify the source.
•
Do not use magnification to view the optical outputs
without proper filtering.
•
Use of controls, adjustments, or procedures not stated
herein might result in hazardous radiation exposure.
•
Read the safety information given in Chapter 2 of the
DSP-4000 Users Manual.
3
DSP-FTA420/30/40
Users Manual
Fiber Test Adapter Features
Figure 2 describes the features of the DSP-FTA4XX Fiber Test Adapter.
1
OUTPUT
2
INPUT
3
4
agp11f.eps
A
SC output connector. Transmits multimode or singlemode optical
signals.
B
SC input connector. Receives multimode or singlemode optical
signals.
C
DB60 connector and latches for attaching the DSP-FTA4XX unit
to a DSP-4000 test tool.
D
Slide mechanism for locking the DSP-FTA4XX unit to a
DSP-4000 test tool or remote unit.
Figure 2. Features of the DSP-FTA4XX Fiber Test Adapter
4
Fiber Test Adapter
Getting Started
Getting Started
This section describes how to connect the DSP-FTA4XX units and verify their
operation.
Attach a DSP-FTA4XX unit to your DSP-4000 test tool, as shown in Figure 3.
Attach the matching DSP-FTA4XX unit to the DSP-4000 remote unit. The
DSP-FTA4XX units with the same model number are identical, so either one
can be attached to the remote.
Notes
The DSP-FTA4XX Fiber Test Adapters are compatible only with
DSP-4000 test tools and remote units.
Do not mix the model types of the Fiber Test Adapters at the main
and remote units. While no damage will result, the units will not
operate when mixed.
This manual assumes that you have used the DSP-4000 test tool to
test copper cable. If you need more detailed instructions about using
the DSP-4000 test tool, refer to the DSP-4000 Users Manual.
tt02f.eps
Figure 3. Attaching a DSP-FTA4XX
5
DSP-FTA420/30/40
Users Manual
Cleaning the Fiber Connections
Always clean the fiber endfaces before making connections. Use any of the
following:
•
Lint-free swabs or wipes moistened with optical grade isopropyl alcohol
•
Pre-moistened swabs or wipes approved for use on fiber connectors
•
Cassette-style cleaning devices designed for use on fiber connectors
(follow the manufacturer’s instructions for use)
Canned air approved for use on fiber connectors is also useful for dislodging
contamination. Protect all connectors with dust caps when not in use.
Verifying Operation
Use the DSP-4000 test tool’s self-test feature to verify that the DSP-FTA4XX
units are working properly, as follows:
1.
Clean all fiber connections.
2.
Connect as shown in Figure 4.
3.
Run the self test from the test tool’s SPECIAL FUNCTIONS mode.
4.
If the self test fails, verify that your patch cords are good, clean the fiber
endfaces; then run the self test again. If it continues to fail, contact Fluke
Networks as described under "Contacting Fluke Networks".
6
Fiber Test Adapter
Getting Started
Patch cords of the same type as the fiber
to be tested and SC at test tool ends
Adapters
OUTPUT
DSP-4000
INPUT
OUTPUT
INPUT
DSP-4000
CABLE ANALYZER
SMART REMOTE
PASS
TESTING
1
2
3
4
EXIT
FAULT
INFO
TEST
Test tool
with fiber test
adapter
FAIL
Remote
with fiber test
adapter
TALKING
LOW BATTERY
TALK
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
ON
SPECIAL
FUNCTIONS
OFF
agp03f.eps
Figure 4. Connections for a Self Test
7
DSP-FTA420/30/40
Users Manual
Summary of Fiber Test Settings
Table 1 briefly describes the settings required for testing fiber links. See the
descriptions under "Setting up for Fiber Tests" for more details on each setting.
Table 1. Settings for Testing Fiber
Setting
Description of Options
TEST STANDARD,
CABLE TYPE
In SETUP, select the test standard and cable type
(multimode or singlemode) that applies to the fiber
under test.
REMOTE END
CONFIGURATION
In SETUP, select Smart Remote, Loopback,
or Far End Source Mode.
Smart Remote Mode uses a pair of DSP-FTA4XX
units.
Loopback Mode uses one DSP-FTA4XX unit.
Far End Source Mode requires a separate optical
source, such as the Fluke FOS-850/1300, FS-150
multimode sources or the Fluke LS-1310/1550
laser source.
Figures 8, 9, and 10 show the three
configurations.
NUMBER OF
ADAPTERS
NUMBER OF
SPLICES
8
If required, in SETUP set the numbers of adapters
and splices added to each fiber path since the
reference was set.
ADAPTER TYPE
In SETUP, select the type of adapter. The graphic
Help screens show how to connect the test unit
with different adapter types.
SET FIBER
REFERENCE
In SPECIAL FUNCTIONS, set the reference power
level for the power loss test. Figures 5, 6, and 7
show the reference connections for the three
remote end configurations.
Fiber Test Adapter
Setting Up for Fiber Tests
Setting Up for Fiber Tests
This section tells you how to configure your test tool for testing fiber links.
Selecting a Test Standard and Fiber Type
Fiber test standards define limits for losses in adapters and splices, the length
of fiber optic links, and other parameters. When you select a standard, the test
tool also prompts you to select a cable type.
Note
The DSP-4000 test tool is programmed with the standards available
when the unit leaves the factory. When new standards emerge, they
will be included with DSP-4000 software upgrades available from
Fluke. Refer to the DSP-4000 Users Manual for information on
upgrades or contact Fluke Networks on the World Wide Web at
www.flukenetworks.com.
Select a fiber test standard and cable type as follows:
1.
Attach a DSP-FTA4XX unit to the DSP-4000 test tool. Turn the DSP4000 test tool’s rotary switch to SETUP; then press E.
2.
Select the TEST STANDARD,CABLE TYPE menu item and then
press E or the Choice softkey !.
3.
Use the arrow keys to highlight the desired test standard; then press E.
4.
Use the arrow keys to select the appropriate fiber type; then press E.
9
DSP-FTA420/30/40
Users Manual
Setting the Remote End Configuration
In the SETUP mode, select the remote end configuration that matches your test
configuration (usually, you will use Smart Remote Mode):
•
Smart Remote Mode uses a pair of DSP-FTA4XX units: one on the
DSP-4000 main unit and one on the remote unit. (Refer to Figure 8.)
•
Loopback Mode uses just one DSP-FTA4XX unit on the DSP-4000 main
unit. (Refer to Figure 9.) You can use this mode to test a single fiber or a
spool of fiber. In this case, you would connect the fiber ends to the patch
cords on DSP-FTA4XX output and input ports.
•
Far End Source Mode is used with a laser source, such as the
Fluke LS-1310/1550 Laser Source, to test singlemode fiber. You can also
use Far End Source Mode with a separate multimode source, such as the
Fluke FOS-850/1300 Fiber Optic Source. (Refer to Figure 10.)
Selecting the Adapter Type
The test tool provides graphic help screens to show you how to make the
proper fiber connections for testing. Since the connections are not the same for
all types of adapters, you will want to select the adapter type to match the
connectors on the fiber links you will be testing. Selecting the adapter type will
be particularly helpful when you are testing Small Form Factor (SFF) fiber
links.
In the SETUP mode, press the $ Page Down softkey until you find the
adapter type setting. To modify the setting, press E. The default setting for
the adapter type is General. Use this setting if you are not sure what type of
adapter you are testing.
10
Fiber Test Adapter
Setting Up for Fiber Tests
Setting the Number of Adapters and Splices
Some test standards use a calculated limit for the loss test. This limit includes
the number of adapters and splices in the link. In the test tool’s SETUP mode,
enter the number of adapters and number of splices added in each direction of
the fiber path since the reference was set. For example, the reference
connections in Figure 5 show one adapter in each path. When power loss is
measured as shown in Figure 8, there are three adapters in each path. You have
added two adapters in each path, so you would enter "2" for the "Number of
Adapters" count in SETUP.
The test tool uses the number of adapters and splices you enter and the
measured length of the fiber to calculate the loss limit for the link. If the
measured loss is greater than the calculated limit allows, the link fails.
The insertion loss allowed for each adapter or splice depends on the selected
test standard. If necessary, you can change the insertion loss used for adapters
or splices by creating a custom test as described on page 38.
Setting a Reference
The reference is used for power loss and delay measurements. Setting a
reference lets your DSP-4000 test tool automatically subtract out the losses or
delays due to patch cords or the DSP-FTA4XX units. The loss and delay for a
fiber under test is automatically calculated as the difference between the
reference loss and delay and those values measured with the fiber inserted.
For the most accurate test results, you should set the reference at these times:
•
Anytime you start using a different DSP-FTA4XX unit or other optical
source.
•
Anytime you reconnect a or change the patch cord used on the DSPFTA4XX OUTPUT port or other source.
Note
For the most accurate test results, set the reference at the beginning
of each day using the test configuration (Figure 5, 6, or 7) you will be
using that day.
The test tool stores separate reference values for each remote end
configuration.
11
DSP-FTA420/30/40
Users Manual
Setting a Reference for Smart Remote Mode
1.
Turn on the test tool and the remote. Let the DSP-FTA4XX units warm up
for five minutes. Set the remote end configuration to Smart Remote Mode.
2.
Choose four known-good SC/ST patch cords of fiber type matching the
cables to be tested, e.g., 50 µm multimode; 62.5 mulitmode, or
singlemode. Clean all fiber endfaces.
Note
If the fiber to be tested does not use ST adapters, select patch cords
with SC adapters on one end and the appropriate adapters on the
other end. Mate the cables with the appropriate adapters.
3.
Make the connections shown in Figure 5.
4.
Turn the rotary switch to SPECIAL FUNCTIONS. Select Set Fiber
Reference; then press E.
12
Fiber Test Adapter
Setting Up for Fiber Tests
Patch cords of the same type as the fiber
to be tested and SC at test tool ends
Adapters
OUTPUT
DSP-4000
INPUT
OUTPUT
INPUT
DSP-4000
CABLE ANALYZER
SMART REMOTE
PASS
TESTING
1
2
3
4
EXIT
FAULT
INFO
TEST
Test tool
with fiber test
adapter
FAIL
Remote
with fiber test
adapter
TALKING
LOW BATTERY
TALK
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
ON
OFF
agp03f.eps
Figure 5. Setting a Reference for Smart Remote Mode
13
DSP-FTA420/30/40
Users Manual
Setting a Reference for Loopback Mode
1.
Turn on the test tool. Let the DSP-FTA4XX units warm up for five
minutes. Set the remote end configuration to Loopback Mode.
2.
Choose two known-good SC/ST patch cords of fiber type matching the
cables to be tested, e.g., 50 µm multimode; 62.5 mulitmode, or
singlemode. Clean all fiber endfaces.
Note
If the fiber to be tested does not use ST adapters, select patch cords
with SC adapters on one end and the appropriate adapters on the
other end. Mate the cables with the appropriate adapters.
3.
Make the connections shown in Figure 6.
4.
Turn the rotary switch to SPECIAL FUNCTIONS. Select Set Fiber
Reference; then press E.
Patch cords of the same type as the fiber
to be tested and SC at test tool ends
Adapter
INPUT
OUTPUT
DSP-4000
1
CABLE ANALYZER
2
3
4
EXIT
FAULT
INFO
TEST
Test tool
with fiber test
adapter
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
agp04f.eps
Figure 6. Setting a Reference for Loopback Mode
14
Fiber Test Adapter
Setting Up for Fiber Tests
Setting a Reference for Far End Source Mode
1.
Turn on the test tool and the optional source. Set the remote end
configuration to Far End Source Mode. Let the DSP-FTA4XX units warm
up for five minutes. Let the optional source warm up as required.
2.
Choose two known-good patch cords of fiber type matching the cables to
be tested, e.g., 50 µm multimode; 62.5 mulitmode, or singlemode with the
appropriate connector types. Clean all fiber connectors.
3.
Make the connections shown in Figure 7.
4.
Turn the rotary switch to SPECIAL FUNCTIONS. Select Set Fiber
Reference; then press E.
Optical patch cords
(SC at test tool end)
Adapter
INPUT
OUTPUT
CW
MOD
CAUTION
1310 OFF 1550
SOURCE ACTIVE
LOW BATTERY
DSP-4000
1
CABLE ANALYZER
2
3
4
EXIT
FAULT
INFO
TALK
TEST
ENTER
SAVE
Test tool
with fiber test
adapter
Optical source
(such as
Fluke LS-1310/1550
or FOS-850/1300)
LS-1310/1550
LASER SOURCE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
agp05f.eps
Figure 7. Setting a Reference for Far End Source Mode
15
DSP-FTA420/30/40
Users Manual
Changing the Index of Refraction
The index of refraction, n, is the ratio of the velocity of light in free space to
the velocity of light in a fiber. This value is used with the measured
propagation delay to determine fiber length.
The test tool can store n values for 50 µm multimode, 62.5 µm multimode and
singlemode cable types. One set is for the standard tests and eight sets are used
for custom tests.
If you need to change the factory setting for n to match the fiber you are
testing, proceed as follows:
1.
Turn the rotary switch to SETUP. Use $ Page Down and E to
find and highlight the index of refraction setting.
2.
Use DU and LR to adjust the setting to the desired value; then press
E.
If you change n for a custom test setup, this n value will be used only for that
custom test. If you are not setting up a custom test, the new n value will be used
for all tests except custom tests.
Running an Autotest
The Autotest certifies dual-fiber links based on the fiber standard you select.
An Autotest can be used to check optical power loss, fiber length, and
propagation delay.
You can also use the Autotest in Far End Source Mode to measure loss on a
single fiber. Using Autotest, rather than a Single Test, gives the option of
saving the test results. If you use an optional multimode source, such as the
Fluke FOS-850/1300 source, Autotest measures optical power loss only.
16
Fiber Test Adapter
Running an Autotest
Run an Autotest as follows:
1.
Turn the test tool’s rotary switch to AUTOTEST and turn on the remote (if
used). Let the DSP-FTA4XX units warm up for five minutes.
2.
Verify that the Autotest display shows the correct test standard, cable type,
and remote end configuration. You can change these selections in the
SETUP mode.
3.
Select patch cords of the same type as the fiber to be tested. Refer to
Figures 8, 9, and 10 for the number of patch cords required for your
remote end configuration. Clean all fiber endfaces.
4.
If you wish, you can press @ Help to show how to make the fiber
connections. You can select the type of adapter in the SETUP mode. This
will be particularly helpful when testing Small Form Factor (SFF) links.
5.
Set the reference level if it has not already been set. (See "Setting a
Reference" on page 11.)
6.
Connect the test tool to the fiber cable as appropriate. Refer to Figures 8,
9, and 10.
7.
To start the Autotest, press E.
If you are using Far End Source Mode, select the wavelength that matches
the source; then press E. For other modes, the DSP-4000 test tool
automatically switches wavelengths during the Autotest.
8.
If bi-directional testing is enabled, the test tool stops halfway through the
bi-directional Autotest and prompts you to swap the fiber connections.
Swap the connections at the patch panel or link connector, not at the
DSP-FTA4XX ports.
17
DSP-FTA420/30/40
Users Manual
Optical patch cord
Fiber Link
Optical patch cords
(SC at test tool ends)
INPUT
OUTPUT
INPUT
OUTPUT
Optical patch cords
(SC at test tool ends)
Optical
Connections
DSP-4000
DSP-4000
CABLE ANALYZER
SMART REMOTE
PASS
TESTING
FAIL
TALKING
LOW BATTERY
1
2
3
4
EXIT
FAULT
INFO
TEST
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
Test tool
with fiber test
adapter
Remote
with fiber test
adapter
TALK
ON
OFF
agp07f.eps
Figure 8. Test Connections for Smart Remote Mode
18
Fiber Test Adapter
Running an Autotest
Optical patch cord
Optical patch cords
(SC at test tool ends)
OUTPUT
Fiber
under
test
INPUT
Optical
Connections
DSP-4000
1
CABLE ANALYZER
2
3
4
EXIT
FAULT
INFO
TEST
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
Test tool
with fiber test
adapter
agp06f.eps
Figure 9. Test Connections for Loopback Mode
19
DSP-FTA420/30/40
Users Manual
Optical patch cord
(SC at test tool end)
Optical patch cord
Fiber link
Optical patch cord
INPUT
OUTPUT
Optical
connections
CW
MOD
CAUTION
DSP-4000
1
LOW BATTERY
CABLE ANALYZER
2
3
4
EXIT
FAULT
INFO
TALK
ENTER
TEST
1310 OFF 1550
SOURCE ACTIVE
SAVE
Test tool
with fiber test
adapter
Optional laser
source
OFF
LS-1310/1550
LASER SOURCE
MONITOR
SINGLE
TEST
AUTO
TEST
SETUP
PRINT
SPECIAL
FUNCTIONS
agp08f.eps
Figure 10. Test Connections for Far End Source Mode
20
Fiber Test Adapter
Saving Autotest Results
Saving Autotest Results
To save the results of the last Autotest, press S. Use the test tool’s
alphanumeric display to enter one or two fiber names, depending on which
remote end configuration was used:
•
In Smart Remote Mode, the test tool saves two reports for each Autotest:
one for the fiber connected to the output port and one for the fiber
connected to the input port.
Enter a name for the fiber connected to the DSP-FTA output port; then
press S. Next, enter a name for the fiber connected to the input port;
then press S again.
•
In Loopback Mode and Far End Source Mode, the test tool saves one
report for each Autotest. Enter a name for the fiber; then press S.
You can edit the fiber identification assigned to a saved report as follows:
1.
Turn the rotary switch to SPECIAL FUNCTIONS; select
View/Delete Test Reports, then press E.
2.
Select the desired report, then press ! View Result twice (for the
Far End Source Mode you only need to press ! View Result
once).
3.
Press Rename Report. Use the alphanumeric display to edit the fiber
identification; then press S.
You can edit a custom header, operator name, or site name in the PRINT mode
under Edit Report Identification.
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DSP-FTA420/30/40
Users Manual
Autotest Results for Smart Remote Mode
This section describes the DSP-FTA4XX fiber tests and the results produced
when you run an Autotest using Smart Remote Mode. The descriptions of loss
and length tests also apply to Single Tests using Smart Remote Mode.
To see the complete results for a test, press ! View Result on the first
Autotest display, use D to highlight the desired test, then press E.
Pass/Fail and Headroom Results for Smart Remote
Mode
The pass/fail result shown on the first Autotest display tells you if the fiber link
tested within the limits of the selected test standard.
Headroom is the smallest margin found between the measured power loss and
the loss limit. Headroom indicates how much more loss you could have in the
link without exceeding the limits of the selected test standard. If you tested two
fibers, you can determine which fiber produced the smallest margin by viewing
the loss results of the output and input fibers.
Loss for Smart Remote Mode
Loss is the optical power lost through the fiber, adapters, splices, and other
components in a fiber link. The test tool determines power loss by calculating
the difference between the received power and the reference power level. The
loss is compared to the limit allowed by the selected test standard to produce a
pass or fail result.
Table 2 describes the loss results for Smart Remote Mode.
22
Fiber Test Adapter
Autotest Results for Smart Remote Mode
Table 2. Loss Results for Smart Remote Mode
Result
Fiber
Description
The fiber (output or input) that corresponds to the
test results.
If bi-directional testing is enabled, the output fiber
is the fiber you connected to the output port of the
main unit after swapping the fibers.
Direction
(A-B or B-A):
Direction A-B runs from the main unit to the
remote; B-A runs from the remote to the main unit.
Only displayed if Bi-directional testing is enabled.
Result
PASS means the power loss is less than allowed
for the link.
FAIL means the loss exceeded the limit.
Loss (dB)
The measured power loss. Loss is automatically
measured at wavelengths.
Limit (dB)
The maximum loss allowed by the selected test
standard. For some standards, the limit is
calculated using the numbers of adapters and
splices you entered and the losses allowed for
these by the test standard.
Margin (dB)
The difference between the limit and the measured
loss. This number is negative if the link failed.
23
DSP-FTA420/30/40
Users Manual
Length Results for Smart Remote Mode
The test tool determines fiber length by measuring the propagation delay
through the fiber, then using the index of refraction to calculate the length.
Table 3 describes the length results for Smart Remote Mode.
Table 3. Length Results for Smart Remote Mode
Result
Description
Length
The length of each fiber.
Limit
The maximum length the test standard allows for one fiber.
Result
Pass means the measured length is less than the limit.
Fail means the length exceeds the limit.
Note
When there is too much loss to determine length, the length is
reported as a question mark.
24
Fiber Test Adapter
Bi-Directional Testing
Bi-Directional Testing
When you need to test fibers in both directions, the DSP-FTA4XX units can
perform bi-directional testing and save the bi-directional results for each fiber.
You enable this feature in the SETUP mode under BI-DIRECTIONAL
TEST.
Swapping Connections
To get bi-directional results for Smart Remote Mode, the test tool stops
halfway through a bi-directional Autotest and prompts you to swap the fiber
connections. Swap the connections on both the main and remote units.
Note
To avoid disturbing the connections to DSP-FTA4XX output ports,
always swap the connections at the patch panel or adapter, not at the
DSP-FTA4XX connectors.
The test tool does not support bi-directional testing in Loopback Mode.
In Far End Source Mode, the test tool does not prompt you to swap
connections. If you need bi-directional results in this mode, swap the locations
of the test tool and the source; change the direction of the test (select A-B or
B-A under @ Options on the Far End Source Autotest display); then run
a second Autotest.
Bi-Directional Autotest Results
Bi-directional Autotest results list the test directions as A-B and B-A. In Smart
Remote Mode, "A-B" runs from the main unit to the remote; "B-A" runs from
the remote to the main unit. “Output Fiber” refers to the fiber that you
connected to the main unit’s OUTPUT port after you swapped the fibers.
25
DSP-FTA420/30/40
Users Manual
Autotest Results for Loopback Mode
This section describes the Autotest results for Loopback Mode. The
descriptions of loss, length, and propagation delay tests also apply to Single
Tests using Loopback Mode.
To see the complete results for a test, press ! View Result on the first
Autotest display, use D to highlight the desired test, then press E.
Pass/Fail and Headroom Results for Loopback Mode
The pass/fail result shown on the first Autotest display tells you if the fiber link
tested within the limits of the selected test standard. Headroom indicates how
much more loss you could have in the link without exceeding the limits of the
selected test standard.
Loss Results for Loopback Mode
Table 4 describes the loss results for Loopback Mode.
26
Fiber Test Adapter
Autotest Results for Loopback Mode
Table 4. Loss Results for Loopback Mode
Result
Description
Result
PASS - the power loss is less than allowed for the
link.
FAIL- the loss exceeded the limit.
Loss (dB)
The combined loss of all fibers in the link under
test. Loss is automatically measured at both
wavelengths.
Limit (dB)
The maximum loss allowed by the selected test
standard. For some standards, the limit is
calculated using the numbers of adapters and
splices you entered and the losses allowed for
these by the test standard.
Margin (dB)
The difference between the limit and the
measured loss. This number is negative if the link
failed
Length Results for Loopback Mode
Table 5 describes the length test results for Loopback Mode.
Table 5. Length Results for Loopback Mode
Result
Description
Length
The measured length. The result shows the combined
length of all fibers between the output port and the input
port.
Limit
The maximum length the test standard allows for a fiber.
Result
Pass means the measured length is less than the limit.
Fail means the length exceeds the limit.
Note
When there is too much loss to determine length, the length is
reported as a question mark.
27
DSP-FTA420/30/40
Users Manual
Autotest Results for Far End Source Mode
An Autotest using Far End Source Mode measures loss for singlemode or
multimode fibers.
The Autotest runs continuously until the e key is pressed. Table 6 describes
the results.
The results display also features softkeys that are available only for Far End
Source Mode:
•
Options: Lets you set the direction of the test (A-B or B-A).
•
Power: Lets you measure optical power at the selected wavelength.
28
Fiber Test Adapter
Autotest Results for Far End Source Mode
Table 6. Loss Results for Far End Source Mode
Result
PASS/FAIL
Description
Pass means the power loss is less than allowed
by the limit.
Fail means the loss exceeded the limit.
Loss (dB)
The measured optical power loss.
Limit (dB)
The maximum allowable loss for the selected
standard.
Cable length and
wavelength
The fiber type and wavelength selected before the
Autotest was performed.
A-B or B-A
The direction of the test. To set the direction,
press
@ Options; then select the desired direction.
Reference
The current reference value. See the earlier
section “Setting a Reference for Far End Source
Mode” for information.
Date and time
The date and time the reference was set.
29
DSP-FTA420/30/40
Users Manual
Single Tests
The SINGLE TEST mode on the DSP-4000 rotary switch lets you run
individual fiber tests. Single Tests are useful for quick checks of continuity,
length, or loss, and for isolating faults and testing repairs. Single Tests run
continuously, so you can make adjustments to a link and watch the results as
they happen.
Single Tests for Smart Remote Mode
If an Autotest fails, you can use these tests to isolate problems on one of the
fibers in a link. To connect for a Single Test in Smart Remote Mode, refer to
Figure 8.
•
Loss (Output Fiber or Input Fiber): Measures optical
power loss on the fiber connected to the main unit’s output or input port.
•
Length: Measures fiber length, as done during an Autotest.
•
Propagation Delay: Determines the propagation delay of each
fiber.
•
Near End Power or Far End Power: Measures the optical
power received by the main unit (near end) or the remote unit (far end).
•
Send (850 nm, 1300 nm, 1310 nm, 1550 nm,
VCSEL 850 nm,or FP 1300 nm ): The possible wavelengths
displayed depend on the type of Fiber Test Adapter installed. The FTA420 allows 850 nm or 1300 nm (multimode). The FTA-430 allows 1310
nm or 1550 nm singlemode. The FTA-440 allows VCSEL 850 nm or FP
1300 nm laser. The main unit continuously transmits light of the selected
wavelength from its output port.
30
Fiber Test Adapter
Single Tests
Single Tests for Loopback Mode
Use these tests to troubleshoot fiber links, test patch cords, and check spools of
fiber before installation.
•
Total Loss: Measures the optical power loss between the output and
input ports of the DSP-FTA4XX unit. If two fibers are connected end-toend with a loopback cable, the total loss of both fibers is displayed.
•
Total Length: Measures the total length of the fiber between the
output and input ports of the DSP-FTA4XX unit. If two fibers are
connected end-to-end with a loopback cable, the total length of all fibers is
displayed.
•
Propagation Delay: Measures the total propagation delay of the
of the fiber between the output and input ports of the DSP-FTA4XX unit.
•
Power: Measures the optical power received at the input port on the
main unit. Power is measured at 850 nm and 1300 nm.
•
Send (850 nm, 1300 nm, 1310 nm, 1550 nm,
VCSEL 850 nm, or FP 1300 nm): The possible wavelengths
displayed depend on the type of Fiber Test Adapter installed. The FTA420 allows 850 nm or 1300 nm (multimode). The FTA-430 allows 1310
nm or 1550 nm singlemode. The FTA-440 allows VCSEL 850 nm or FP
1300 nm laser. The main unit continuously transmits light of the selected
wavelength from its output port.
Single Test for Far End Source Mode
The Receive test, which requires a separate multimode or singlemode
source at the far end, continuously measures optical power at the main unit.
With a multimode selected, you can measure power at 850 nm, 1300 nm,
VCSEL 850 nm, or FP 1300 nm laser. With a singlemode selected, you can
measure power at 1310 nm, 1550 or 1625 nm.
31
DSP-FTA420/30/40
Users Manual
Monitoring Optical Power
You can use the MONITOR position of the DSP-4000 rotary switch to monitor
the output power produced by a source such as an optical network interface
card or optical test equipment. You can also monitor the power received at the
end of a fiber link.
To monitor optical power, proceed as follows:
1.
Select a known-good patch cord of fiber type matching the fiber type used
during normal systme operation. Clean all fiber connectors.
2.
Connect the test tool to the optical source as shown in Figure 11.
3.
Turn the rotary switch to MONITOR.
4.
Select Optical Power; then press E.
5.
Select the appropriate multimode or singlemode wavelength to monitor;
then press E.
6.
To switch between measurements in dBm and µW (microwatts), press
!.
32
Fiber Test Adapter
Monitoring Optical Power
Optical patch cord
(SC at test tool end)
OUTPUT
INPUT
OUTPUT
DSP-4000
1
CABLE ANALYZER
2
3
4
Test tool
with fiber test
adapter
Optical network interface card
or optical power source
EXIT
FAULT
INFO
TALK
ENTER
TEST
SAVE
MONITOR
SINGLE
TEST
SETUP
AUTO
TEST
PRINT
SPECIAL
FUNCTIONS
OFF
Monitoring optical power at a source
Optical patch cord
(SC at test tool end)
OUTPUT
Optical
connections
INPUT
DSP-4000
Optical
patch cord
Fiber link
CABLE ANALYZER
OUTPUT
1
2
3
4
EXIT
FAULT
INFO
TEST
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
Test tool
with fiber test
adapter
Optical network interface card
or optical power source
SETUP
PRINT
SPECIAL
FUNCTIONS
Monitoring optical power at the end of a link
agp09f.eps
Figure 11. Monitoring Optical Power
33
DSP-FTA420/30/40
Users Manual
Using the Talk Mode
With a pair of DSP- FTA4XX Fiber Test Adapters, you can use the DSP-4000
headsets for two-way voice communication over the two fibers under test.
To use the Talk mode, connect the main and remote units for Smart Remote
Mode, then press V on either unit. (Refer to Figure 8 for connections.)
To adjust the volume at the main unit, use the U D keys. On the remote unit,
press V to cycle through the volume settings.
To exit Talk mode, press e on the main unit.
The Talk mode turns off automatically when you start a fiber test or turn the
rotary switch to a new position.
Using the FindFiber™ Feature
The FindFiber feature lets you quickly check fiber connectivity and can help
you determine which fibers go to which connectors at a patch panel.
Note
The FindFiber feature is not available in Far End Source Mode.
Use the FindFiber feature as follows:
1.
For Smart Remote Mode, make the connections shown in Figure 12. For
Loopback Mode, make the connections shown in Figure 13.
2.
Turn the rotary switch to SPECIAL FUNCTIONS; then press E. Turn
on the remote unit if you using Smart Remote Mode.
3.
Press E to start the FindFiber test.
4.
For Smart Remote mode, try various connections to the patch panel with
the main unit’s INPUT fiber until the Receiving Near End result
shows PASS. Then, try various connections with the main unit’s
OUTPUT fiber until the Receiving Far End result shows PASS.
Tables 7 and 8 show the main unit results and remote unit LED results for
Smart Remote Mode.
34
Fiber Test Adapter
Using the FindFiber™ Feature
For Loopback Mode, try various connections with the main unit’s INPUT
fiber until the Receiving Near End result shows PASS.
Table 7. Main Unit Results for the FindFiber Test (Smart Remote Mode)
Results
Description
Receiving Near End: FAIL
The main unit’s INPUT fiber path is not
complete. The main unit cannot determine
the state of the OUTPUT fiber path.
Receiving Far End: ?
Receiving Near End: PASS
Receiving Far End: FAIL
The main unit’s INPUT fiber path is
complete. The main unit’s OUTPUT fiber
path is not complete.
Receiving Near End: PASS
Both fiber paths are complete.
Receiving Far End: PASS
Table 8. Smart Remote LED Results for the FindFiber Test
Results
No LEDs flash
Description
The remote unit’s INPUT fiber path is not
complete.
Only the TEST LED flashes
The remote unit’s INPUT fiber path is complete.
TEST and PASS LEDs flash
Both fiber paths are complete.
35
DSP-FTA420/30/40
Users Manual
Fiber Link
OUTPUT
OUTPUT
INPUT
DSP-4000
INPUT
DSP-4000
CABLE ANALYZER
SMART REMOTE
PASS
TESTING
FAIL
TALKING
LOW BATTERY
1
2
3
4
EXIT
FAULT
INFO
TEST
TALK
SAVE
ENTER
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
Test tool
with fiber test
adapter
Remote
with fiber test
adapter
TALK
ON
OFF
agp12f.eps
Figure 12. Using FindFiber with a Smart Remote
36
Fiber Test Adapter
Using the FindFiber™ Feature
Fiber Link
INPUT
OUTPUT
DSP-4000
1
CABLE ANALYZER
2
3
4
EXIT
FAULT
INFO
TEST
TALK
ENTER
SAVE
MONITOR
SINGLE
TEST
AUTO
TEST
OFF
SETUP
PRINT
SPECIAL
FUNCTIONS
Test tool
with fiber test
adapter
agp13f.eps
Figure 13. Using FindFiber with a Loopback Cable
37
DSP-FTA420/30/40
Users Manual
Configuring a Custom Fiber Test
In some cases, you might want to create your own custom test, rather than use
the standard tests stored in your test tool. The test tool’s Configure Custom Test
function lets you define up to four custom fiber standards.
You can set the following parameters for fiber tests:
•
Custom test name
•
Test standard for default test values (To save time when creating a custom
test, you can base your custom test on a test standard or another custom
test.)
•
Multimode (50 µm or 62.5 µm) or singlemode cable type
•
Maximum length of the fiber if applicable
•
Maximum loss or loss/km at:
850 nm and 1300 nm for FTA-420
1310 nm and 1550 nm for FTA-430
850 nm and 1300 nm for FTA-440
•
Maximum loss per connector
•
Maximum loss per splice
•
Index of refraction (n) if applicable
38
Fiber Test Adapter
Fiber Test Reports
Configure a Custom Test as follows:
1.
On the last page of the SETUP mode, CONFIGURE CUSTOM TEST,
select a Custom Cable from the list; then press E.
2.
If you want to edit the name of the custom test, press E; then use the
alphanumeric display to enter a new name. Press SAVE when the name
change is completed.
3.
Set the initial values for your custom test by selecting the desired standard
and cable type under USE DEFAULT VALUES FROM:.
4.
To see and change other parameters use Page Down, Page Up and
the cursor up and down keys to select the desired item. Press E, make
the change, press E again to retain the desired change. Pressing
EXIT discards the change.
Press e to exit the custom fiber test screens.
Press ! ABORTto exit the custom fiber test setup screens without
saving any changes.
Press @ Set to Default to reset a value to the initial value for
the selected standard.
Fiber Test Reports
Fiber test reports can be saved, viewed, printed, and uploaded to a PC in the
same way as other DSP-4000 test reports. See Chapter 5 in the DSP-4000
Users Manual for more information.
Maintenance
Clean the case with a soft cloth dampened with water or a mild detergent. Do
not use abrasives or solvents.
Clean the optical connectors as described under "Cleaning the Fiber
Connections". Always cover the connectors with a dust cap when not in use.
39
DSP-FTA420/30/40
Users Manual
Do not open the DSP-FTA4XX case. There are no user-serviceable parts
inside.
Calibration
Have the DSP-FTA4XX units calibrated at an authorized Fluke Service Center
every 12 months.
Repair
If a DSP-FTA4XX unit requires service, pack it in the original shipping
container and send it, postage paid and insured, to the nearest Fluke Service
Center. Include a written description of the problem. Fluke assumes no
responsibility for shipping damage. Refer to the warranty for warranty repair
terms. Contact the nearest service center for post-warranty repair terms and
prices.
Contacting Fluke Networks
To contact Fluke Networks, call one of the following telephone numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-678-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
Or, visit the Fluke Networks Web site at www.flukenetworks.com.
Replacement Parts and Accessories
Table 9 shows the replacement parts and accessories available for the
DSP-FTA4XXS Fiber Test Option Set.
Fluke may make additional accessories available. For a current list, contact
Fluke Networks or visit www.fluke Networks.com.
40
Fiber Test Adapter
Replacement Parts and Accessories
Table 9. Replacement Parts and Accessories
Description
Fluke Part Number
or Model Number
SC/ST patch cord, multimode, 62.5 µm
FOC-ST/SC
ST/ST patch cord, multimode, 62.5 µm
NF230
SC/ST patch cord, multimode, 50.0 µm
NF500
ST/ST patch cord, multimode, 50.0 µm
NF510
SC/ST patch cord, singlemode
ST/ST patch cord, singlemode
NF110SM
NF101SM
ST/ST adapter
NF300SM
SC/SC adapter
NF310SM
Dust cap for the SC connector on the DSP-FTA4XX
Fiber Test Adapter
LC Accessory Kit, 62.5 um, multimode
669991
NFK1-LC
MT-RJ Accessory Kit, 62.5 um, multimode
NFK1-MTRJ
VF-45 Accessory Kit, 62.5 um, multimode
NFK1-VF45
Fiber Jack Accessory Kit, 62.5 um, multimode
850/1300 Multimode Fiber Optic Source
NFK1-FJ
FS-150
LS-1310/1550 Singlemode Laser Source
LS-1310/1550
FOS-850/1300 Multimode Fiber Optic Source
FOS-850/1300
DSP-FTA420/30/40 Users Manual, English
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DSP-FTA420/30/40
Users Manual
Specifications
General Specifications
Power supply: ±6 V supplied by the DSP-4000 test tool.
Temperature range: Operating: 0 ºC to +40 ºC; Storage: -10 ºC to +60 ºC
Warm-up time: 5 minutes
Humidity range: Operating: 0 % to 75 % RH, non-condensing
Storage: 0 % to 95 % RH, non-condensing
Certifications:
Dimensions: 3.3” x 4.6” x 1.9” (8.3 cm x 11.6 cm x 4.7 cm)
Weight: 7.6 oz (215 g)
Optical Transmitter
Connector: SC, multimode
Emitter type:
FTA420 - Multimode LED
FTA430 - Singlemode laser
FTA440 - 850 nm Vertical Cavity Surface Emitting Laser (VCSEL);
1310 nm FP laser
Wavelengths:
FTA420 - 850 nm and 1300 nm
FTA430 - 1310 nm and 1550 nm
FTA 440 - 850nm and 1310 nm
Power output:
FTA420 -20 dBm (10 µW), typical (into 62.5/125 µm fiber)
FTA430 and FTA440 -10 dBm
Power output stability (8 hours): ±0.25 dB at 23 °C
42
Fiber Test Adapter
Specifications
Optical Receiver
Power measurement accuracy: ±0.25 dBm at 23 °C, 45 % RH to 75 % RH, -20
dBm for 850 nm and 1300 nm, -10 dBm for 1550 and 1625 nm
Connector: SC, multimode or singlemode
Detector type: InGaAs
Calibrated wavelengths: 850 nm, 1300 nm, 1310 nm, 1550 and 1625 nm.
Power measurement range: +3 dBm to -50 dBm
Power measurement linearity: ±0.25 dB at 23 °C
Length Measurement:
Measured in Loopback Mode with included SC/ST patch cables and
one pair of ST/ST adapters.
FTA420 - 5000 meters of 62.5 um multimode cable
FTA430 - 10000 meters of singlemode cable
FTA440 - 5000 meters of 50.0 um multimode cable
Length measurement accuracy: ±1.5 m plus 2 % of length
43
DSP-FTA420/30/40
Users Manual
44
Appendix A
Fiber Troubleshooting Guide
Table 10 on the next page lists some common problems in fiber links and gives
possible causes.
45
DSP-FTA420/30/40
Users Manual
Table 10. Common Problems in Fiber Links
Problem
Possible Causes
No power is
measured at a source
The optical source is defective.
Power loss is much
more than expected
The fibers are connected to the wrong ports on a
DSP-FTA4XX unit.
The patch cord is defective.
The fibers are swapped at one end of the link.
A patch cord is broken. Retest using a different set
of patch cords.
Power loss is
somewhat more than
expected
There is one or more dirty connections in the link.
Clean all fiber endfaces and retest.
The number of adapters or splices set in SETUP is
too low.
The reference power level is incorrect. Set the
reference again using the same patch cords to be
used for testing.
A patch cord or fiber segment has the wrong core
size. For example, you are using 62.5 µm patch
cords to connect to a 50 µm fiber. Or, you are
using multimode patch cords or adapters to
connect to singlemode fiber.
A known length of
cable measures too
long or too short.
46
The index of refraction is not set correctly for the
fiber under test. Set the index of refraction to give
the correct length for a known length of the fiber.
Appendix B
Glossary
Adapter
A device used to mate fiber connectors of the same or different styles.
Attenuation
A loss of optical power, mostly due to poor connections or to light diffusion
caused by imperfections in the fiber material (scattering).
Bandwidth
The range of frequencies a fiber can transmit without significant power loss.
Buffer
A layer of protective material surrounding the cladding of a fiber. The buffer
helps protect the fiber from physical damage.
Cladding
A glass coating surrounding a fiber core to reflect light back into the core.
Core
The light-conducting central portion of an optical fiber.
47
DSP-FTA420/30/40
Users Manual
dBm
A unit of power (in decibels), assuming a reference of 1 mW (1/1000 of a
watt).
The dBm unit expresses loss or gain as a ratio of output power to the reference
power, as follows:

dBm = 10  log

output power 
1 mW


Full-duplex
Simultaneous transmission of data in two directions.
Headroom
The smallest margin in a set of loss margins.
Index of refraction (n)
The ratio of the velocity of light in a vacuum to the velocity of light in a fiber.
Light travels more slowly through a fiber than through a vacuum, so n values
are always greater than or equal to one.
Insertion loss
Loss of optical power caused by adding a connector, adapter, splice, or other
optical component to a fiber path.
Launch cable
A fiber patch cord used to couple an optical source to a fiber.
Macrobending losses
Light losses due to large-radius bends in a fiber, such as bends made during
installation.
48
Glossary
Margin
The difference between the measured power loss and the maximum loss
allowed for the link.
Microbending losses
Light losses due to microscopic imperfections in a fiber.
Multimode fiber
Fiber with a relatively large core (50 µm or more) that offers many paths, or
modes, for propagation of light.
n
See index of refraction.
Numerical aperture
A parameter that represents a fiber’s ability to gather light. The numerical
aperture is the sine of the maximum angle at which a fiber accepts light. A fiber
with a higher numerical aperture gathers more light.
Optical power
Optical power measured at a source or the end of a fiber and expressed in
microwatts (µW) or in decibels with reference to one milliwatt (dBm).
Propagation delay
The time taken for a light pulse to travel the length of a fiber. Propagation
delay is a function of a the length of a fiber and its index of refraction.
Receive cable
A fiber patch cord used to couple a fiber to an optical receiver.
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DSP-FTA420/30/40
Users Manual
SC connector
Subscription Channel Connector. An optical connector that originated in Japan
and provides push-pull connections, low loss, and low backreflection.
Singlemode fiber
Fiber with a small core (8 µm to 10 µm) that offers just one path, or mode, for
propagation of light.
ST connector
Straight-Tip Connector. A popular fiber connector originally developed by
AT&T.
SFF connector
Small Form Factor Connector. Several different types are available on the
market, including the MT-RJ, VF-45, LC, and Fiber Jack.
50
Index
—A—
—E—
A-B, 25
accessories, 41
adapters, 11
attaching the FTA4XX, 5
Autotest
bi-directional testing, 25
Far End Source Mode connections,
20
Far End Source Mode results, 28
Loopback Mode connections, 19
Loopback Mode results, 26
running, 16
saving results, 21
Smart Remote Mode connections,
18
Smart Remote Mode results, 21
equipment
optional, 41
standard, 2
—B—
B-A, 25
bi-directional testing, 25
—F—
Far End Source Mode
Autotest results, 28
reference connections, 15
softkeys, 28
test connections, 20
when to use, 10
fiber type, selecting, 9
FindFiber, 35
Fluke Networks, contacting, 40
—G—
glossary, 45
—H—
headroom, 22
—C—
—I—
cable type, selecting, 9
calibration, 39
cleaning fibers, 6
compatibility with test tools, 5
connectors, 11
custom fiber tests, 38
index of refraction, changing, 16
input fiber, 23, 25
insertion loss, 11
—D—
definitions, 45
direction (Far End Source Mode), 28
direction of tests, 25
—L—
laser source
reference connections, 15
test connections, 20
length
Loopback Mode, 27
Smart Remote Mode, 24
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DSP-FTA420/30/40
Users Manual
limit (Far End Source Mode), 28
locating fibers, 35
Loopback Mode
Autotest results, 26
reference connections, 14
test connections, 19
loss
Far End Source Mode, 29
Loopback Mode, 27
Smart Remote Mode, 22
loss budget, 11
—M—
maintenance, 39
margin, 22
multimode source, 10
Autotest with, 16
—N—
n, changing, 16
number of adapters and splices, 11
—O—
optical power, 32
options softkey, 28
output and input fibers, Autotest reports, 21
output fiber, 23, 25
—P—
power softkey, 28
propagation delay
Loopback Mode, 28
Smart Remote Mode, 24
—R—
reference, 11
Loopback Mode, 14
Smart Remote Mode, 12
remote end configuration
which to use, 10
2
repair, 40
replacement parts, 41
—S—
safety information, 3
saving Autotest results, 21
self-test, 6
send
Loopback Mode, 31
Smart Remote Mode, 30
service, 40
set fiber reference, 11
Far End Source Mode, 15
Loopback Mode, 14
Smart Remote Mode, 12
single tests, 30
singlemode (Far End Source Mode),
10
singlemode source
reference connections, 15
test connections, 20
Smart Remote Mode
Autotest results, 21
reference connections, 13
test connections, 18
specifications, 42
splices, 11
standard equipment, 2
—T—
talk mode, 34
test standard, selecting, 9
testing the DSP-FTA4XX, 6
—V—
voice communications, 34
volume for talk mode, 34
—W—
website, Fluke Networks, 40
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