HP 83491A, 83492A, 83493A User Manual
User’s Guide
HP 83491/2/3A
Clock Recovery Modules
© Copyright Hewlett-Packard
Company 1999
All Rights Reserved. Reproduction, adaptation, or translation without prior written
permission is prohibited,
except as allowed under copyright laws.
HP Part No. 83491-90011
Printed in USA
June 1999
Hewlett-Packard Company
Lightwave Division
1400 Fountaingrove Parkway
Santa Rosa, CA 95403-1799,
USA
(707) 577-1400
Notice.
The information contained in
this document is subject to
change without notice. Companies, names, and data used
in examples herein are fictitious unless otherwise noted.
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regard to this material, including but not limited to, the
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errors contained herein or for
incidental or consequential
damages in connection with
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or use of this material.
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forth in subparagraph (c) (1)
(ii) of the Rights in Technical
Data and Computer Software
clause at DFARS 252.227-7013
for DOD agencies, and subparagraphs (c) (1) and (c) (2)
of the Commercial Computer
Software Restricted Rights
clause at FAR 52.227-19 for
other agencies.
Warranty.
This Hewlett-Packard instrument product is warranted
against defects in material and
workmanship for a period of
one year from date of shipment. During the warranty
period, Hewlett-Packard Company will, at its option, either
repair or replace products
which prove to be defective.
For warranty service or repair,
this product must be returned
to a service facility designated by Hewlett-Packard.
Buyer shall prepay shipping
charges to Hewlett-Packard
and Hewlett-Packard shall pay
shipping charges to return the
product to Buyer. However,
Buyer shall pay all shipping
charges, duties, and taxes for
products returned to HewlettPackard from another country.
Hewlett-Packard warrants
that its software and firmware
designated by Hewlett-Packard for use with an instrument
will execute its programming
instructions when properly
installed on that instrument.
Hewlett-Packard does not
warrant that the operation of
the instrument, or software,
or firmware will be uninterrupted or error-free.
Limitation of Warranty.
The foregoing warranty shall
not apply to defects resulting
from improper or inadequate
maintenance by Buyer, Buyersupplied software or interfacing, unauthorized modification or misuse, operation
outside of the environmental
specifications for the product,
or improper site preparation
or maintenance.
No other warranty is
expressed or implied.
Hewlett-Packard specifically
disclaims the implied warranties of merchantability and fitness for a particular purpose.
Exclusive Remedies.
The remedies provided herein
are buyer's sole and exclusive
remedies. Hewlett-Packard
shall not be liable for any
direct, indirect, special, incidental, or consequential damages, whether based on
contract, tort, or any other
legal theory.
Safety Symbols.
CAUTION
The
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.
WAR NI NG
The
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.
sign denotes a
caution
warning
sign denotes a
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.
The CE mark is a registered trademark of
the European Community.
The CSA mark is a registered trademark of
the Canadian Standards Association.
The C-Tick mark is a
registered trademark
of the Australian Spectrum Management
Agency.
This text denotes the
ISM1-A
instrument is an
Industrial Scientific
and Medical Group 1
Class A product.
ii
General Safety Considerations
General Safety Considerations
WARNING
WARNING
WARNING
CAUTION
CAUTION
Light energy can radiate from the front panel
HP 83492A and HP 83493A modules. The light emitted from these
connectors is the slightly attenuated light that is input to the front-
Input
panel
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 which all means for protection are intact) only.
NO OPERATOR SERVICEABLE PARTS INSIDE. Refer servicing to
qualified Hewlett-Packard personnel. To prevent electrical shock, do
not remove covers.
This product is designed for use in INSTALLATION CATEGORY II and
POLLUTION DEGREE 2, per IEC 1010 and 664 respectively.
Electrostatic discharge (ESD) on or near input connectors can damage circuits
inside the instrument. Repair of damage due to misuse is
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.
This product has been designed and tested in accordance with IEC Publication 1010, Safety Requirements for Electronic Measuring Apparatus, and has
been supplied in a safe condition. The instruction documentation contains
information and warnings which must be followed by the user to ensure safe
operation and to maintain the product in a safe condition.
connector.
Output
connectors on
covered under
not
iii
General Safety Considerations
iv
Contents
General Safety Considerations iii
1 Installation
Installation 1-2
2Operation
HP 83491/2/3A Modules—at a glance 2-2
Front-Panel Features 2-4
Block Diagrams 2-7
To display a signal 2-8
To compensate for module insertion loss 2-9
Using Probes with an HP 83491A 2-10
3 Specifications and Regulatory Information
HP 83491A Specifications 3-3
HP 83492A Specifications 3-4
HP 83493A Specifications 3-6
HP 83491/2/3A Operating Specifications 3-7
Declaration of Conformity 3-8
4 Reference
Front-Panel Optical Adapters 4-2
In Case of Difficulty 4-3
Error Messages 4-5
Electrostatic Discharge Information 4-8
Cleaning Connections for Accurate Measurements 4-10
Returning the Module for Service 4-21
Hewlett-Packard Sales and Service Offices 4-24
Contents-1
Contents
Contents-2
1
To install the module 1-3
To connect cables to an HP 83492A 1-7
Installation
Installation
Installation
Installation
HP 83491/2/3A modules require that firmware revision A.06.25 or later be
installed in the HP 83480A. If you wish to install the module in an HP 54750A
digitizing oscilloscope, you must first install the HP 83480K communications
firmware upgrade kit.
To check the HP 83480A’s firmware revision code
CAUTION
CAUTION
1
Press the
2
The firmware revision number is listed under the Frame section of the display.
Fiber-optic connectors are easily damaged when connected to dirty or
damaged cables and accessories. The HP 83492A and HP 83493A front-panel
input connectors are no exception. When you use improper cleaning and
handling techniques, you risk expensive instrument repairs, damaged cables,
and compromised measurements. Before you connect any fiber-optic cable to
an HP 83492A or HP 83493A module, refer to “Cleaning Connections for
Accurate Measurements” on page 4-10.
The circuits on electrical inputs and outputs can be damaged 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 “Electrostatic
Discharge Information” on page 4-8.
Utility
key and then the
System config
softkey.
1-2
Installation
Installation
To install the module
1
Verify that all system components ordered have arrived by comparing the
shipping forms to the original purchase order. Inspect all shipping containers.
The shipment includes:
❒
An HP 83491/2/3A Clock Recovery Module
❒
Fiber-optic adapter cable
❒
Two RF adapter cables
❒
HP 83491/2/3A Clock Recovery Modules User’s Guide (this book)
If your shipment is damaged or incomplete, save the packing materials and
notify both the shipping carrier and the nearest Hewlett-Packard Sales and
Service office. HP will arrange for repair or replacement of damaged or incomplete shipments without waiting for a settlement from the transportation company. Notify the HP customer engineer of any problems.
1
Make sure that the serial number listed on the module’s rear-panel label
matches the serial number listed on the shipping document.
(HP 83492/3A module only)
(HP 83491A module only)
NOTE
Figure 1-1. Serial number label
2
Install the HP 83491/2/3A module into the HP 83480A mainframe’s left slot.
Finger-tighten the knurled screw on the front panel of the plug-in module to
ensure that the module is securely seated in the mainframe.
Installing the module into the left slot ensures that the supplied adapter cable
will fit. See Figure 1-2.
1-3
Installation
Installation
Figure 1-2. Position of modules in the mainframe
3
Clean all optical interfaces as described in “Cleaning Connections for Accurate
Measurements” on page 4-10, before making measurements
4
Perform the following steps if you’re installing an HP 83492/3A module:
.
WARNING
a
Unscrew and remove the fiber-optic adapter that is located on the optical
module’s front-panel optical input connector.
b
Connect the adapter that was removed in the previous step onto the
HP 83492/3A module’s front-panel
Input
connector.
On HP 83492A module’s, the input connector used depends on the
wavelength of the input signal. Refer to “To connect cables to an
HP 83492A” on page 1-7.
5
Connect the supplied adapter cable as shown in Figure 1-3.
Light energy can radiate from the front panel
Output
connectors on
HP 83492A and HP 83493A modules. The light emitted from these
connectors is the slightly attenuated light that is input to the front-
Input
panel
6
Turn on the HP 83480A, and connect a modulated signal to the HP 83491/2/3A
module’s
1-4
connector.
Input
connector.
CAUTION
Installation
Installation
Figure 1-3. The adapter cable
HP 83491A Modules:
HP 83491A Modules: Maximum safe signal input level is ±5V. The input circuits
HP 83491A Modules: HP 83491A Modules:
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. Avoid touching the front-panel input
connectors without first touching the frame of the instrument. Be sure that the
instrument is properly earth-grounded to prevent buildup of static charge.
CAUTION
HP 83492/3A Modules:
7
On the HP 83480A, press the
trigger 2
select
8
On the HP 83491/2/3A module, repeatedly press the
(the HP 83491/2/3A module) for the trigger source.
Maximum safe signal input level is +3 dBm.
Trigger
key and then the
Source
softkey. Then,
SELECT
key until a front-
panel light indicates the data rate of the signal. See Figure 1-4 on page 1-6.
Green and red data-rate lights
The data-rate indicator lights change color between red and green to show which data
rate is selected. A red light does
indicate a problem. A red light shows that the adja-
not
cent 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 HP 83491A modules for example,
the first selection cycle shows 155 Mb/s selected. The second section cycle shows 1062
Mb/s selected.
1-5
Installation
Installation
Figure 1-4. Front-panel lights
Clock
Unlocked
Data
and
is off.
light
outputs on an oscilloscope. Waveforms should be
9
Confirm that the
10
Observe the
present. The instrument is now ready for you to begin making measurements.
1-6
Installation
Installation
To connect cables to an HP 83492A
On HP 83492A modules, the front-panel fiber-optic connectors reverse input
and output roles depending on the wavelength of the signal. Signals in the
750 nm to 860 nm wavelength range are input to the left connector and output
from the right connector. Signals in the 1000 nm to 1600 nm wavelength range
are input to the right connector and output from the left connector.
Figure 1-5. Input and output connections versus wavelength
1-7
Installation
Installation
1-8
2
HP 83491/2/3A Modules—at a glance 2-2
Front-Panel Features 2-4
Block Diagrams 2-7
To display a signal 2-8
To compensate for module insertion loss 2-9
Using Probes with an HP 83491A 2-10
To compensate for a passive probe 2-11
To compensate an HP 54701A active probe 2-11
To compensate for other devices 2-11
Operation
Operation
HP 83491/2/3A Modules—at a glance
HP 83491/2/3A Modules—at a glance
The HP 83491/2/3A Clock Recovery Modules are designed to operate in an
HP 83480A Digital Communications Analyzer. These modules recover clock
and data information at standard telecom and datacom rates. The resulting
trigger signal is made available to the HP 83480A mainframe via a connector
located on the module’s rear-panel. An external front-panel cable passes the
data signal, with some insertion loss, to the receiver module.
Table 2-1. Module Features
Module Input Connector Selectable Rates (Mb/s)
HP 83491A
HP 83492A
HP 83493A
50Ω electrical
Multimode fiber (62.5/125
Single-mode fiber (9/125
µ
m)
µ
m)
155, 622, 1060, 1250, 2120, 2488, 2500
155, 622, 1060, 1250, 2120, 2488, 2500
155, 622, 1250, 2488, 2500
Figure 2-1. An HP 83493A installed in an HP 83480A mainframe
2-2
Operation
HP 83491/2/3A Modules—at a glance
WARNING
Light energy can radiate from the front panel
Output
connectors on
HP 83492A and HP 83493A modules. The light emitted from these
connectors is the slightly attenuated light that is input to the front-
Input
panel
connector.
Use with HP 71603B or HP 71612B Error Performance Analyzers
The front-panel
Data
and
Clock
outputs provide electrical recovered clock and
regenerated data signals for simultaneous testing with other instruments,
such as the HP 71603B or HP 71612B error performance analyzers.
Multimode module and single-mode reference receivers
HP does
recommend using the HP 83492A multimode module with single-
not
mode reference receivers such as the HP 83481A, HP 83482A, or
HP 83485A,B modules. Connecting multimode to single-mode fibers causes
large reflections and insertion loss because of the reduction of the optical
fiber’s core from 62.5 µm to 9 µm.
Single-mode module and multimode reference receivers
It is acceptable to use an HP 83493A single-mode module with a multimode
reference receiver such as the HP 83486A module. This is true provided that
single-mode fiber is connected to the HP 83493A module’s front-panel
Input
connector.
What you won’t find on these modules . . .
Unlike other modules designed to be used with the HP 83480A digital communications
analyzer, the HP 83491/2/3A modules do not include Channel keys or menus. Also, there
are no GPIB programming commands for these modules.
2-3
Operation
Front-Panel Features
Front-Panel Features
SELECT
Figure 2-2. HP 83491/2/3A front panels
key
key Pressing this key changes the modulation rate of the input signal. The recov-
key key
ered and retimed clock trigger is sent to the mainframe. The
selection is a bypass mode where the data stream directly triggers the mainframe. Refer to “Block Diagrams” on page 2-7 to view a schematic of the normal and bypass paths.
2-4
Trigger On Data
Operation
Front-Panel Features
Green and red data-rate lights
The data-rate indicator lights change color between red and green to show which data
rate is selected. A red light does
indicate a problem. A red light shows that the adja-
not
cent 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 HP 83491A modules for example,
the first selection cycle shows 155 Mb/s selected. The second section cycle shows 1062
Mb/s selected.
UNLOCKED
indicator
Auxiliary outputs
Input and Output
connectors
This light shows when clock recovery cannot be established on the signal. If a
clock rate is selected, the trigger output to the mainframe is disabled to prevent free-run triggering. However in bypass mode (
triggering is
disabled. When the
not
UNLOCKED
Trigger On Data
selected),
light is on, you can establish a
trigger on the data input to the reference receiver.
connector:
connector: This connector provides a fully regenerated version of the
DATA
connector:connector:
input signal. It is intended for monitoring purposes only and
for rigorous
not
eye mask compliance testing. The frequency response does not conform to the
requirements for eye mask testing as described in ITU-T G.957 and Bellcore
GR-253-CORE. On HP 83492A and HP 83493A modules, this port is amplitude
stabilized for input signals greater than approximately –23 dBm.
onnector:
CLOCK c
onnector: This connector provides the recovered clock signal. You can
onnector:onnector:
use this signal to measure jitter transfer, because this output can track and follow input data with very fast jitter; it has a wide bandwidth jitter transfer function when compared to the recovered clock signal which is routed through a
rear-panel connector to the mainframe for triggering. Note that the
iliary Output
errors at the
remains synchronized to input signals several dB below the onset of
DATA Auxiliary Output
.
CLOCK Aux-
The input connectors pass the digitally modulated signal to the receiver module. The input signal, slightly attenuated and available at the
Output
connector,
is connected to the input of any of the HP 83481,2,3,4,5,6, or 7 modules. The
connectors on optical modules include adapters which can easily be changed
to match the type of connectors that are used on your fiber-optic cables. Refer
to “Front-Panel Optical Adapters” on page 4-2 for a description of the avail-
able adapters.
2-5
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