Agilent 37717C Jitter Concept Guide

HP 37717C Communications Performance Analyzer

Jitter Concept Guide

 Copyright HewlettPackard Ltd.1997

Information in this document may apply to modules which use the VxWORKS TM software. The VxWORKS TM software was developed by Wind River Systems, Inc., which has copyright to it.

HP Part No. 37717-90258

First edition, July 97

Printed in U.K.

Warranty

The information contained in this document is subject to change without notice.

Hewlett-Packard mak es no warranty of any kind with regard to this material, including, but not limited to, the implied warranties or merchanability and ﬁtness for a particular purpose.

Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

WARNING

Warning Symbols Used on the Product

!

The product is marked with this symbol when the user should refer to the instruction manual in order to protect the apparatus against damage.

The product is marked with this symbol to indicate that hazardous voltages are present

The product is marked with this symbol to indicate that a laser is ﬁtted. The user should refer to the laser safety information in the Calibration Manual.

Hewlett-Packard Limited Communications Measurements Division South Queensferry West Lothian, Scotland EH30 9TG

Jitter Concept Guide

HP 37717C Communications Performance Analyzer

About This Book

The information on Jitter testing in this book covers the following subjects::

• An Introduction to Jitter, the Jitter modules and their features.

• Measurement examples.

• Measurement result deﬁnitions

• Logging messages

• Self test error codes

For some operations and measurements, information from one of the associated books listed at the rear of this guide may be required.

iv

Contents

1 Introduction to Jitter Testing

Introduction to Jitter 2 Option A3L [A3M] PDH & STM-1 Electrical Jitter Measurements 3 Option A3V [A3W] PDH & STM-1 Optical & Electrical Jitter Measurements 4 Option A3N [A3P] PDH, STM-1 Electrical & Optical & STM-4 Optical Jitter Measurements 5 Option A3K [A3Q] Jitter & Wander Generator 6

2 Jitter Testing

Multiplexer Jitter Tolerance 8 Wander and Slips 13 Desynchroniser Stress 18 SDH Jitter Tolerance 21 In Service SDH Jitter 24 Tributary Mapping Jitter 26 Selective Jitter Transfer Measurement 29 In Service ATM Jitter 36

3 Result Deﬁnitions

Jitter Results 40

v

Contents

4 Jitter Logging Messages

Logging Devices 42 Results Logging 42

5 Jitter Self Test Error Codes

vi

1

“Introduction to Jitter” page 2 “Option A3L [A3M] PDH & STM-1 Electrical Jitter Measurements” page 3 “Option A3V [A3W] PDH & STM-1 Optical & Electrical Jitter Measurements” page 4 “Option A3N [A3P] PDH, STM-1 Electrical & Optical & STM-4 Optical Jitter Measurements” page 5 “Option A3K [A3Q] Jitter & Wander Generator” page 6

1 Introduction to Jitter Testing

.

Introduction to Jitter Testing

Introduction to Jitter

Errors will occur in a digital signal if jitter at the input of Network Equipment exceeds a threshold value. It is important to check that the maximum input jitter , that can be tolerated by that equipment, meets the ITU-T standards for maximum tolerable input jitter.

Excessive jitter not only causes errors, alarms and loss of synchronization but directly affects quality of service within the network.

During the transition from a PDH network to mixed PDH/SDH networks, tight control of jitter levels is essential, especially as new sources of jitter emerge, caused by the mapping process and network synchronization problems resulting in pointer movements. The pointer movements cause trib utary jitter at the PDH output ports of the network element.

Cascading SDH regenerators on long distance links makes a build up of jitter unavoidable. It is vital to keep the jitter accumulation at the line side of the network element to a minimum as the SDH line rate is increasingly being used for synchronization purposes within SDH networks. Excessive line jitter may cause timing problems between network elements resulting in errors and pointer movements.

ATM network elements such as switches, routers, multiplexers and cross connects are also susceptible to jitter and it is therefore important to minimize jitter in ATM networks.

Wander is an extremely slow variation in the timing of the pulse stream. Excessive amounts of wander in a network will cause timing problems resulting in pointer movements. Wander measurements are made at 2 Mb/s, using an external 2 Mb/s MTS (ITU-T G.811) as a reference. Estimated frame and bit slips are also indicative of wander effects.

The HP 37717C provides comprehensive Jitter testing at all PDH and SDH rates from 2 Mb/s to 622.08 Mb/s (STM-4).

PDH Jitter Measurement

Jitter may be measured on the normal PDH Input and results displayed using RESULTS; JITTER.

SDH Jitter Measurement

Jitter may be measured on the signal at the SDH JITTER INPUT and results displayed on the RESULTS; SDH JITTER and RESULTS; AUTO TOLER displays.

2

Introduction to Jitter Testing

Option A3L [A3M] PDH & STM-1 Electrical Jitter Measurements

Option A3L provides Jitter measurement at STM-1 Electrical rate and PDH rates of 2 Mb/s, 8 Mb/s, 34 Mb/s and 140 Mb/s. Compliance to ITU-T O.171 and testing to ITU-T G.825/G.958 is provided.

To measure jitter connect the PDH signal to the PDH IN port of the PDH module (Options UKK, UKJ and UKN) or the STM-1 Electrical signal to the STM-1E IN of the A3L module.

Jitter measurements are available at all PDH rates and STM-1 Electrical rate: Jitter Hit Count Jitter Hit Seconds Jitter Hit Free Seconds Peak Jitter (Positive and Negative) Peak to Peak Jitter Peak rms Jitter

Option A3L [A3M]

Automatic Jitter Transfer with narrowband selective ﬁltering, in

conjunction with Option UHK or A3K, Jitter Generation. The user can control the number of frequency points at which Jitter is

generated, up to 55. Fixed input masks, ITU-T G.823 for PDH and ITU-T G.958 for SDH, are provided. A user deﬁned mask is also available. Jitter Transfer results are displayed in tabular form and in Graphical form. The ITU-T pass mask is also displayed on the graph.

Wander measurements are only available at 2.048 Mb/s: Peak Wander (Positive and Negative)

Peak to Peak Wander Estimated Bit Slips Estimated Frame Slips Implied Frequency Offset

A graphical display of Wander is also provided. DEMOD OUT connector provides a Demodulated Jitter output.

3

Introduction to Jitter Testing

Option A3V [A3W] PDH & STM-1 Optical & Electrical Jitter Measurements

Option A3V provides Jitter measurement at STM-1 Optical and electrical rate and PDH rates of 2 Mb/s, 8 Mb/s, 34 Mb/s and 140 Mb/s. Compliance to ITUT O.171 and testing to ITU-T G.825/G.958 is provided.

To measure jitter connect the PDH signal to the PDH IN port of the PDH module (Options UKK, UKJ and UKN) or the STM-1 Electrical signal to the STM-1E IN of the A3V module or the STM-1 Optical signal to STM-1/STM4 IN of the A3V module.

Jitter measurements are available at all PDH rates and STM-1: Jitter Hit Count Jitter Hit Seconds Jitter Hit Free Seconds Peak Jitter (Positive and Negative) Peak to Peak Jitter Peak rms Jitter

Option A3V [A3W]

Automatic Jitter Transfer with narrowband selective ﬁltering, in

conjunction with Option A3K or UHK, Jitter Generation. The user can control the number of frequency points at which Jitter is

generated, up to 55. Fixed input masks, ITU-T G.823 for PDH and ITU-T G.958 for SDH, are provided. A user deﬁned mask is also available. Jitter Transfer results are displayed in tabular form and in Graphical form. The ITU-T pass mask is also displayed on the graph.

Wander measurements are only available at 2.048 Mb/s: Peak Wander (Positive and Negative)

Peak to Peak Wander Estimated Bit Slips Estimated Frame Slips Implied Frequency Offset

A graphical display of Wander is also provided. DEMOD OUT connector provides a Demodulated Jitter output.

4

Introduction to Jitter Testing

Option A3N [A3P] PDH, STM-1 Electrical & Optical & STM-4 Optical Jitter Measurements

Option A3N provides Jitter measurement at STM-1 Optical and electrical rate, STM-4 Optical rate and PDH rates of 2 Mb/s, 8 Mb/s, 34 Mb/s and 140 Mb/s. Compliance to ITU-T O.171 and testing to ITU-T G.825/G.958 is provided. To measure jitter connect the PDH signal to the PDH IN port of the PDH module (Options UKK, UKJ and UKN) or the STM-1 Electrical signal to the STM-1E IN of the A3N module or the STM-1/STM-4 Optical signal to STM-1/STM-4 IN of the A3N module.

Jitter measurements are available at all PDH rates, STM-1 Optical and electrical rate and STM-4 Optical rate: Jitter Hit Count Jitter Hit Seconds Jitter Hit Free Seconds Peak Jitter (Positive and Negative) Peak to Peak Jitter Peak rms Jitter

Option A3N [A3P]

Automatic Jitter Transfer with narrowband selective ﬁltering, in

conjunction with Option A3K or UHK, Jitter Generation. The user can control the number of frequency points at which Jitter is generated, up to 55. Fixed input masks, ITU-T G.823 for PDH and ITU-T G.958 for SDH, are provided. A user deﬁned mask is also available. Jitter Transfer results are displayed in tabular form and in Graphical form. The ITU-T pass mask is also displayed on the graph.

Wander measurements are only available at 2.048 Mb/s: Peak Wander (Positive and Negative)

Peak to Peak Wander Estimated Bit Slips Estimated Frame Slips Implied Frequency Offset

A graphical display of Wander is also provided. DEMOD OUT connector provides a Demodulated Jitter output.

5

Introduction to Jitter Testing

Option A3K [A3Q] Jitter & Wander Generator

Option A3K [A3Q] Jitter & W ander Generator

Option A3K provides Jitter Generation at all ETSI rates, 2 Mb/s, 8 Mb/s, 34 Mb/s, 140 Mb/s, STM-1 and STM-4 depending on which PDH and SDH options are ﬁtted. Allows the generation of User Deﬁnable Jitter as follows: Spot frequency Jitter within the ITU-T mask. Swept frequency Jitter within the ITU-T mask.

Automatic Jitter Tolerance testing of PDH and SDH networks covering high and low Q systems using ﬁxed jitter tolerance masks. Peak to Peak Jitter and Modulating frequencies as per ITU-T G.823 (PDH) and ITU-T G.958 (SDH). The Automatic Jitter Tolerance results are plotted in graphical form relative to the ITUT mask.

The User can control:

the number of frequency points at which Jitter is generated, up to 55. the Dwell time - time taken at each frequency point. the Delay time - delay at each frequency point before jitter is generated. the Bit error threshold - determines the threshold for the Jitter Tolerance PASS/FAIL decision. High or Low Q Factor selection (2 Mb/s and 8 Mb/s only) the type of mask A or B (SDH only) the Test Pattern

ption A3K

[A3Q]

The jitter modulation can be sourced internally or from an External source. The external modulation is connected to the MOD IN port.

Allows testing to ITU-T G.825. Full ITU-T O.171 generation capability from 10 µΗz to 5 MHz Provides stimulus for Jitter Transfer measurements.

Peak to Peak Jitter and Modulating frequencies as per ITU-T G.823 (PDH) and ITU-T G.958 (SDH).

Provides Wander Generation at 2 Mb/s, STM-1 and STM-4 depending on which PDH and SDH options are ﬁtted. An external clock must be connected to the 2M REF input.

The 2M REF input can be used as an external clock for 2.048 Mb/s PDH transmission. The wander modulation can be sourced internally or from an external source. The

external modulation is connected to the MOD IN port. Allows the generation of User Deﬁnable Spot frequency Wander within the ITU-T mask

6

2

“Multiplexer Jitter Tolerance” page 8 “Wander and Slips” page 13 “Desynchroniser Stress” page 18 “SDH Jitter Tolerance” page 21 “In Service SDH Jitter” page 24 “Tributary Mapping Jitter” page 26 “Selective Jitter Transfer Measurement” page 29 “In Service ATM Jitter” page 36

2 Jitter Testing

This Chapter gives examples of the instrument operation in typical Jitter test applications.

NOTE that actual instrument displays may vary depending on instrument option.

Jitter Testing

Multiplexer Jitter Tolerance

Application

It is important that network equipment can operate correctly in the presence of certain amounts of jitter. ITU-T has speciﬁed tolerance masks of jitter amplitude against jitter frequency which all network equipment must be able to withstand and provide error free operation.

Jitter is applied at the ITU-T speciﬁed jitter frequencies and the amplitude increased beyond the ITU-T mask limits until errors occur or the maximum possible jitter amplitude is reached. The resulting amplitude levels are plotted relativ e to the mask to determine the network elements jitter tolerance.

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

STORED SETTINGS

STORED SETTING NUMBER 0 and pressing .

OTHER

RECALL

Test Setup Procedure (Jitter Tolerance Test)

The following Option must be ﬁtted to the HP 37717C to perform this test :

• A3K [A3Q] - Jitter Generation A3L[A3M], A3V[A3W] or A3N[A3P] Jitter

Measurement

• UKJ or UKK - PDH Module This setup procedure is based on 34 Mb/s CMI, PRBS test data with jitter

terminated in 75 Ω. The HP 37717C Automatic jitter tolerance feature is used and the results plotted on the ITU-T mask.

8

Jitter Testing

Multiplexer Jitter Tolerance

Structured PDH Jitter Tolerance Test This test can be performed using the Unstructured PDH Option UKK but the

network equipment must be looped back at the higher rate.

Unstructured PDH Jitter Tolerance Test

9

Jitter Testing

Multiplexer Jitter Tolerance

1. Connect the HP 37717C to the network equipment. Set the

OTHER

SETTINGS CONTROL

TRANSMITTER AND RECEIVER to INDEPENDENT and set the

TRANSMIT

display MAIN SETTINGS as shown opposite.

PAYLOAD TYPE, PATTERN and PRBS POLARITY selections should match the reqirement of the network equipment.

2. Select JITTER and set

TRANSMIT

up the display as shown opposite. The Jitter Tolerance example shown will

take approximately 10 minutes to complete.

3. Set up the display MAIN

RECEIVE

SETTINGS as shown opposite.

10

Jitter Testing

Multiplexer Jitter Tolerance

4. Set up the STR UCTURED

RECEIVE

SETTINGS display as shown opposite. 34M PAYLOAD selection should match

the PAYLOAD TYPE selection on the

TRANSMIT

MAIN SETTINGS display.

Run the Test (Jitter Tolerance)

Press to start the

RUN/STOP

measurement. The measurement takes approximately

ten minutes to complete and its progress can be monitored on the

TRANSMIT

display.

At the end of the test the results can be viewed on the display.

The results on the display are cleared when is pressed but the display remains available

RESULTS

TRANSMIT

until the next Jitter T olerance measurement is made.

11

Jitter Testing

Multiplexer Jitter Tolerance

If Option A3B or Option A3D Remote Control is ﬁtted the Jitter Tolerance Mask results can be logged to an External printer .

To Log the Auto Tolerance plot and the results which make up the Jitter Auto Tolerance plot:

On the display, LOGGING SETUP , select the

OTHER

LOGGING DEVICE

required logging device under LOGGING PORT . On the CONTROL display, select LOGGING [ON] . On the display: for PDH Jitter select RESULTS ; and press

for SDH Jitter, select RESULTS; and press .

OTHER RESULTS

PRINT NOW

LOGGING

.

JITTER

AUTO TOLER

PRINT NOW

12

Jitter Testing

Wander and Slips

Application

The ITU-T specify the frequency limits within which network equipment clocks should operate. However when network equipment from different manufacturers is connected together errors in transmission may occur due to timing differences.

To avoid this problem Master Timing sources are typically used as a reference timing source for all network equipment. The timing reference is distributed throughout the network as a 2 Mb/s signal.

Problems may arise due to wrongly conﬁgured equipment running on internal clocks or at the junction of different operators network equipment.

Because the timing sources may operate at slightly different frequencies and exhibit long term frequency drift then phase difference (Wander) may occur, between the incoming data and the network equipment. This causes "Bit Slips" in the network equipment buffers and results in frames being repeated or deleted thus reducing the efﬁciency of data transfer.

Default (Known State) Settings

It is advisable to set the HP 37717C to a known state before setting up a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

STORED SETTINGS

Wander and Slips Test Setup Procedure

The following Options must be ﬁtted to the HP 37717C to perform this test :

• A3L or A3V or A3N - Jitter + Wander Measurement and Estimated Slips

• UKJ or UKK - PDH Module

This measurement is made on live trafﬁc and is interfaced at the line terminal equipment monitor point. The HP 37717C is used in a receive only mode to measure the Wander and Estimated Bit Slips.

A SINGLE test period of 24 HOURS is used and use of a printer for the recording of results and alarms is included. A graphical record of the results can be viewed on the HP 37717C display at the end of the test period.

GRAPH

STORED SETTING NUMBER 0 and pressing .

OTHER

RECALL

13

Jitter Testing

Wander and Slips

Wander and Slips Test

1. Select and set up the display

RECEIVE

as shown opposite. Selections of TERMINATION, LINE

CODE and PAYLOAD TYPE should match those of the network equipment.

2. Select the printer and set up the

OTHER

LOGGING

display as shown

opposite. LOGGING PERIOD and LOG ERROR

SECONDS selections can be modiﬁed according to the users requirements.

14

Jitter Testing

Wander and Slips

3. Set up the

TIMING CONTROL

RESULTS

display as shown

opposite. The STORAGE selection enables the

graphics. To disable graphics select STORAGE [OFF].

Graphics can be stored to the instrument store - INTERNAL or to DISK.

4. Select .

WANDER BAR GRAPH

RESULTS

is selected but or

WANDER

BIT SLIPS

may be selected without

affecting the measurement.

Run the Test (Wander and Slips)

1. Press until the Monitor

SIGNAL IN

indicator, above the key, is lit.

2. Connect the PDH IN port to the line terminal equipment monitor point.

3. Connect the network master timing source to the HP 37717C 2 Mb/s REFERENCE input.

If no reference signal is connected to the HP 37717C then the status message "NO REF" is displayed.

4. Press to start the measurement.

RUN/STOP

15

Jitter Testing

Wander and Slips

If is selected the current

BAR GRAPH

wander measurements are displayed in graphical form. Three positive and negative sliding bar graphs, of ± 1 UI,

± 16 UI and ± 256 UI, are displayed.

The Bar Graph displays are additive - in this example -1.125 UI.

• The measurement results and alarms are available on the display

RESULTS

during the test period.

• The test can be halted at any time by pressing .

RUN/STOP

At the End of the Test (Wander and Slips)

• The Date and Time the test started and the instrument setup are logged on the

printer.

• Any alarms which occur during the test period will be logged on the printer.

• At the end of the test period a complete set of results are logged on the printer.

• A graphical record of the results during the test period can be viewed on the

GRAPH

display. If Remote Control option 1A8 (HP-IB) or 1CW (RS-232-C), or A3B or A3D is ﬁtted the graph results can be logged to an external printer, at a later date. See Graphics and External HP 550C DeskJet Printer in the Masinframe Operating Manual.

• Results and Alarm summaries can be viewed on the display.

GRAPH

The total graphics store capacity is normally 20,000 events. An event is the occurrence of an error or an alarmThe resolution, determined by the selection made under STORAGE on the display, affects the ZOOM capability when

RESULTS

viewing the bar graphs. If 1 SECOND is selected all resolutions are available under ZOOM.

If 1 MIN is selected only 1 MIN/BAR, 15 MINS/BAR and 60 MINS/BAR are available.If 15 MINS is selected only 15 MINS/BAR and 60 MINS/BAR are available. If 1 HOUR is selected only 60 MINS/BAR is available.

Up to 10 sets of graphical results can be stored. If an attempt is made to store more than 10 sets of results, then a ﬁrst in ﬁrst out policy is operated and the oldest set of

16

Jitter Testing

Wander and Slips

results will be lost. If graphics are enabled and a test is run which exceeds the remaining storage capacity, then some previously stored graphical results will be lost.

T o prev ent accidental overwriting of pre viously stored results the graphics capability should be disabled, when graphical results are not required, by selecting STORAGE [OFF] on the display.

RESULTS

17

Jitter Testing

Desynchroniser Stress

Application

At the boundary of the SDH network the 2 Mb/s or 140 Mb/s payload is demapped from the SDH signal. Pointer adjustments in the SDH signal may cause high levels of tributary jitter in the output payload. Excessive amounts of tributary jitter will result in errors.

The desynchronizing phase lock loop of the network element should minimize the level of tributary jitter in the payload but correct operation under stress conditions must be veriﬁed.

The desynchronizing phase lock loop can be stressed by adding pointer movement sequences (deﬁned in ITU-T standard G.783) to the SDH signal such that the test VC-4 or TU moves with respect to the SDH frame.

A jitter measurement is made to verify that the desynchroniser output jitter is within the required speciﬁcation.

Default (Known State) Settings

It is advisable to set the HP 37717C to a known state before setting up a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

STORED SETTINGS

Desynchroniser Stress Test Setup Procedure

The following options must be ﬁtted to the HP 37717C to perform this test:

• UKK or UKJ - PDH module

• A3L or A3V or A3N - Jitter measurement module

• A3R - SDH module

• UH1 STM-1 or 130 or 131 - STM-0/1/4 Optical interface

The HP 37717C PDH/SDH test set transmits an STM-4 optical signal carrying 2 Mb/s payload. Pointer movement sequences are added in a controlled manner.

The desynchroniser output is returned to the HP 37717C and a jitter measurement is performed on the demapped 2 Mb/s signal.

18

STORED SETTING NUMBER 0 and pressing .

OTHER

RECALL

Jitter Testing

Desynchroniser Stress

1. Connect the HP 37717C to the network equipment. Set the

OTHER

SETTINGS CONTROL

TRANSMITTER AND RECEIVER to INDEPENDENT and set the

TRANSMIT

SDH display as shown opposite. The CLOCK SYNC selection determines

the synchronization source for the TRANSMIT clock. If

EXTERNAL MTS

is selected a 2 Mb/s reference must be connected to the 2M REF IN port. The format can be CLOCK or DATA.

2. Set up the TEST

TRANSMIT

FUNCTION display as shown opposite. Pointer adjustments are made every 10 ms

with an extra ADDED adjustment as deﬁned in ITU-T standard G.783.

Pointer sequences are started by selecting POINTER SEQUENCES .

STARTED

19

Jitter Testing

Desynchroniser Stress

3. Set up the JITTER

RECEIVE

PDH

display as shown opposite. If Jitter ﬁltering is required select from the

softkey menu.

4. Set up the TIMING

RESULTS

CONTROL display as shown opposite.

Start the Desynchroniser Stress Test

1. Press to start the Jitter

RUN/STOP

measurement. . Jitter Hits can be viewed without affecting

the measurement.

20

Jitter Testing

SDH Jitter Tolerance

Application

It is important that network equipment can operate correctly in the presence of certain amounts of jitter. ITU-T has speciﬁed tolerance masks of jitter amplitude against jitter frequency which all network equipment must be able to withstand and provide error free operation.

Jitter is applied at the ITU-T speciﬁed jitter frequencies and the amplitude increased until errors occur or the mask limit is reached. These amplitude levels are plotted on the mask to determine the network elements jitter tolerance.

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

STORED SETTINGS

STORED SETTING NUMBER 0 and pressing .

OTHER

RECALL

Test Setup Procedure (Jitter Tolerance Test)

The following Option must be ﬁtted to the HP 37717C to perform this test :

• UHK - Jitter Generation

• UKJ or UKK - PDH Module

• A3R - SDH Module

• UH1, 130 or 131 - Optical Interface Module

This setup procedure is based on STM-4 optical test signal with jitter terminated in 75 Ω. The HP 37717C Automatic jitter tolerance feature is used and the results plotted on the ITU-T mask.

21

Jitter Testing

SDH Jitter Tolerance

TEST SET

PDH IN

STM-1/STM-4

OUT

STM-4 OPT

2 Mb/s

1. Connect the HP 37717C to the network equipment. Set the

OTHER

SETTINGS CONTROL

TRANSMITTER AND RECEIVER to INDEPENDENT and set the

TRANSMIT

SDH display as shown opposite. CLOCK SYNC, STM-1 UNDER TEST

and PAYLOAD selections can be modiﬁed according to the users requirements.

ADD

DROP

MUX

Select JITTER and set

TRANSMIT

SDH

up the display as shown opposite. This Auto Tolerance example will take

approximately nine minutes to complete.

22

Jitter Testing

SDH Jitter Tolerance

Set up the MAIN

RECEIVE

PDH

SETTINGS display as shown opposite.

Run the Test (SDH Jitter Tolerance)

Press to start the

RUN/STOP

measurement. The measurement takes approximately

nine minutes to complete and its progress can be monitored on the

TRANSMIT

display.

At the end of the test the results can be viewed on the display.

The results on the display are cleared when is pressed but the display remains

RESULTS

TRANSMIT

RESULTS

available until the next Jitter Tolerance measurement is made.

To Log the Auto Tolerance plot : Select the required logging device on the

OTHER

LOGGING

LOGGING [ON]. Select

JITTER AUTO TOLER

PRINT NOW

.

display..Select

RESULTS

and press

23

Jitter Testing

In Service SDH Jitter

Application

It can be useful at the installation or ﬁeld trial stage of SDH rings or linear networks to verify the networks tolerance to jitter under simulated Live Trafﬁc conditions and monitor its effects on the network equipment i.e Alarms particularly OOF and LOF.

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

STORED SETTINGS

STORED SETTING NUMBER 0 and pressing .

Test Setup Procedure (In Service SDH Jitter)

The following Option must be ﬁtted to the HP 37717C to perform this test :

• A3K - Jitter Generation

OTHER

RECALL

ADD

DROP

MUX

• UKJ or UKK - PDH Module

• A3R - SDH Module

• UH1, 130 or 131 - Optical Interface Module

In this set up the received SDH signal has Jitter added and is retransmitted via SDH THRU mode. The Swept Mask feature is used and the HP 37717C "sweeps" through the jitter mask, adjusting the jitter amplitude according to the jitter frequency. The network equipment alarms are monitored particularly OOF and LOF.

TEST SET

STM-1 IN

STM-1 OPT

STM-1 OUT

STM-1 OPT

ADD

DROP

MUX

24

Jitter Testing

In Service SDH Jitter

Select and set up the

RECEIVE

SDH

display as shown opposite. PAYLOAD and PAYLOAD TYPE

selections can be modiﬁed according to the users requirementst.

Select and set up the

TRANSMIT

SDH

display as shown opposite.

Run the Test (In Service SDH Jitter)

Select JITTER and set

TRANSMIT

SDH

up the display as shown opposite. When JITTER MASK [SWEPT] is

selected the HP 37717C will "sweep" through the jitter mask adjusting amplitude according to the Jitter frequency.

Monitor the network alarms, particularly Out Of Frame and Loss Of Frame.

25

Jitter Testing

Tributary Mapping Jitter

Application

Tributary Mapping jitter occurs during the mapping and demapping process inside SDH network equipment as the PDH signal is mapped into its Virtual Container.

The method used for mapping an asynchronous 2 Mb/s into a VC-12 provides a number of opportunities to justify the 2 Mb/s data. The justiﬁcation process allows for variations between the 2.048 Mb/s clock and the clock timing the synchronous network. This process however introduces jitter into the tributary signal when it is demapped from the VC-12.

Tributary Mapping jitter has four basic characteristics:

1 It is low in amplitude (ITU-T G.783 speciﬁcations listed below)

TU-T G.783 Mapping Jitter Speciﬁcations.

Payload Offset (ppm) Measurement Bandwidth Maximum Jitter (UI pk-pk)

2 Mb/s

34 Mb/s

139 Mb/s

± 50 ± 20 ± 15

18 - 100 kHz 0.08 10 - 800 kHz 0.08

10 - 3500 kHz 0.08

2 It is relatively high frequenc y (and can therefore be suppressed by the SDH NE’ s

de-synchronizer).

3 It varies in amplitude as the PDH tributary frequenc y is offset relative to the VC-

n. This is due to changes in the mappings "bit-stuff justiﬁcation" ratio to compensate for such offsets.

4 The peak mapping jitter occurs at a small offset from 0 ppm (PDH tributary

relative to VC-n).

26

Jitter Testing

Tributary Mapping Jitter

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

STORED SETTINGS

STORED SETTING NUMBER 0 and pressing .

OTHER

RECALL

Test Setup Procedure (Tributary Mapping Jitter)

The following Option must be ﬁtted to the HP 37717C to perform this test :

• A3L or A3V or A3N - Jitter Receiver

• UKJ or UKK - PDH Module

• A3R - SDH Module

• UH1, 130 or 131 - Optical Interface Module

In this set up Frequency Offset is added to a TU12 tributary within an STM-4 SDH signal. A Jitter measurement is performed on the received TU12 tributary.

TEST SET

PDH IN

STM-4 OUT

ADM

STM-4

2 MHz MTS Clock

2 Mb/s

Tributary Mapping Jitter Test

27

Jitter Testing

Tributary Mapping Jitter

Connect the HP 37717C to the network equipment. Set the

OTHER

SETTINGS CONTROL

TRANSMITTER AND RECEIVER to INDEPENDENT and set the

TRANSMIT

SDH display as shown opposite. The 2M OFFSET can be varied during the

test.

Select and set up the

RECEIVE

PDH

display as shown opposite. TERMINATION and LINE CODE

selections should matc that of the network equipment.

STM-1 UNDER TEST, TU PAYLOAD, PATTERN, PRBS POLARITY and PATTERN IN OTHER TU’S selections can be modifed according to the users requirements.

Select JITTER and set

RECEIVE

PDH

up the display as shown opposite. Any ﬁlter can be selected from the softkey

menu.

Run the Test (Tributary Mapping Jitter)

Press to start the Jitter measurement.

RUN/STOP

The Jitter Amplitude and Jitter Hits results can be viewed on the display.

RESULTS

28

Jitter Testing

Selective Jitter Transfer Measurement

The problem with many SDH jitter analyzers is the fact that their receivers are wideband receivers and are not able to measure within a sufﬁciently narrow bandwidth. The reason is that these instruments are designed to measure peak to peak jitter in the transmission network for troubleshooting purposes and are not designed to make selective jitter measurements. The jitter analyzer just measures the peak-peak value of the incoming jitter over a wide frequency range. The problem occurs when testing the jitter transfer of real network equipment i.e. SDH regenerators. The regenerator produces intrinsic jitter and this disturbs the measurement as the jitter receiver cannot determine whether it is measuring the jitter produced by the jitter analyzers transmitter or the intrinsic jitter which is generated, at a different frequency , by the re generator . The problem is greatest at the higher jitter modulating frequencies when the amount of jitter generated, as per ITU-T G.958, is much smaller. The measurement is corrupted by the higher amplitude intrinsic jitter generated by the regenerator at lower frequencies and incorrectly measured by the analyzer. The accurate method for measuring jitter transfer requires a selective measurement. The HP 37717C uses narrow band ﬁltering in the jitter receiver which allows selection and measurement of the relevant jitter components. This provides the capability to measure jitter selectively and provide accurate and repeatable results. Jitter Transfer is performed to ITU-T G.823/G.958 with Graphical and Tabular results. The input jitter can conform to ITU-T G.823/G.958 or be user deﬁned.

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

SETTINGS RECALL

Test Setup Procedure (Jitter Transfer Test)

The following Options must be ﬁtted to the HP 37717C to perform this test:

• A3K [A3Q] - Jitter Generation

• A3L or A3V or A3N - Jitter Measurement

• A3R - SDH Module

• UH1 or 130 or 131 - Optical Interface

STORED SETTING NUMBER 0 and pressing .

OTHER

STORED

29

Jitter Testing

Selective Jitter Transfer Measurement

This setup procedure is based on 155.52 Mb/s (STM-1), 140 Mb/s payload, PRBS test data with jitter. The jitter generation and jitter measurement are pro vided by the HP 37717C. The HP 37717C is calibrated in a back to back mode, to remove any inaccuracies before the automatic Jitter Transfer measurement is made.

NOTE To achieve the required accuracy:

1.The HP 37717C must be connected back to back in order to perform a calibration cycle before making a Jitter Transfer measurement.

2. The HP 37717C must have been switched on for 1 hour before starting a calibration cycle.

3. The climatic conditions must remain stable from switch-on to end of measurement.

4. The Jitter Transfer measurement must be started within 10 minutes of completion of the Calibration.

5. If maximum Delay time, maximum Dwell time and maximum number of Points is selected the accuracy speciﬁcation cannot be guaranteed as the time from start of calibration to end of measurement (test period) will be approximately two hours. It is recommended that the maximum test period does not exceed 90 minutes. Test Period = Delay Time + Dwell Time + 5 Seconds X Number of Points X 2 (Calibration + Measurement).

Calibrate the HP 37717C

Before making Automatic Jitter transfer measurements the HP 37717C must be calibrated to remove any uncertainties. The calibration is carried out by connecting the HP 37717C back to back.

For this test connect STM-1/STM-4 OUT of the Optical module to STM-1/STM-4 IN of the Jitter Measurement module Option A3V [A3W] or A3N [A3P].

NOTE If 1550 nm STM-1/4 SDH Jitter Transfer is required a 10 dB attennuator must be

connected between STM-1/4 OUT of the Optical module and STM-1/STM-4 IN of the Jitter Measurement module Option A3V [A3W] or A3N [A3P].

If PDH Jitter Transfer is required connect PDH IN to PDH OUT.

If STM-1 Electrical Jitter Transfer is required connect STM-1E OUT of the SDH Module to STM-1E IN of the Jitter Measurement module Option A3L [A3M] or A3V [A3W] or A3N [A3P].

30

Jitter Testing

Selective Jitter Transfer Measurement

1. Set up the OTHER SETTINGS CONTROL display as shown opposite.

Any SDH settings change made on the

TRANSMIT

or displays will

RECEIVE

automatically occur on the other.

2. Select SDH and

TRANSMIT

SDH

set up the display as shown opposite. If 1550 nm STM-1/4 SDH Jitter Transfer

is required a 10 dB attennuator must be connected between STM-1/4 OUT of the Optical module and STM-1/STM-4 IN of the Jitter Measurement module Option A3V [A3W] or A3N [A3P].

3. Setup the

RECEIVE

SDH JITTER

display as shown opposite. For CALIBRATION, HP 37717C

connected back to back, select LEVEL [TERMINATE].

If the measurement is to be made at a network equipment monitor point select MONITOR after the CALIBRATION is completed before making the jitter transfer measurement.

The RECEIVER RANGE, HIT THRESHOLD, FILTER and ADDITIONAL RMS FILTER selections not valid for Jitter Transfer measurements.

31

Jitter Testing

Selective Jitter Transfer Measurement

4. Select MODE [CALIB] on the

TRANSMIT

JITTER display.

Select the NUMBER OF POINTS at which jitter transfer measurements are to be made.

Select the DELAY TIME in the range 5.0 to 30.0 seconds. This determines the time the jitter is generated at each jitter frequency.

DWELL TIME is selectable in the range

5.0 seconds to 30.0 seconds and determines the time delay between the jitter frequency/amplitude being applied and the test being performed. The greater the DWELL time the more accutate the measurement due to increased averaging. This is of particular beniﬁt when measuring in a critical area with only a few POINTS selected.

The NUMBER OF POINTS, DWELL TIME and DELAY TIME determine the time the calibration and eventually the measurement will take to complete.

Select the INPUT MASK as G.958A or G.958B to correspond to the type of regenerator being tested. The PASS MASK will adopt the same selection.

5. Press to start the calibration.

RUN/STOP

The Jitter Transfer display is replaced by an information display for the duration of the Calibration.

A bar graph showing the progress of the calibration will appear on the display.

When the Calibration is complete the display will revert to the

TRANSMIT

JITTER display. The Jitter Transfer measurement must be

started within 10 minutes of the completion of Calibration.

32

Jitter Testing

Selective Jitter Transfer Measurement

TEST SET

STM1/STM4 STM1/STM4

IN OUT

REGENERATOR

Jitter Transfer Test

Automatic Jitter Transfer Measurement

1. Remove the back to back connection and connect the HP 37717C to the network equipment as shown above.

NOTE If the measurement is to be made at a network equipment monitor point select

LEVEL [MONITOR] on the display before making the

RECEIVE

SDH JITTER

jitter transfer measurement.

2. Select JITTER, select MODE and press

RUN/STOP

TRANSMIT

MEASURE

to start the measurement.

SDH

The Jitter Transfer results are plotted in Graph form and the graph’s progress can be monitored on the display.

TRANSMIT

33

Jitter Testing

Selective Jitter Transfer Measurement

NOTE Changing the HP 37717C conﬁguration or any Jitter Transfer parameter will

invalidate the CALIBRATION. If this occurs the CALIBRATION must be repeated before a Jitter Transfer measurement is made.

3. The Jitter Transfer results can also be viewed in TEXT form on the

RESULTS

display. The following information is displayed for

each result: Point Number Jitter Frequency Mask value Result Pass / Fail Indication.

Results 13 to 55 can be viewed on pages 2 through 5.

4. At the end of the measurement the Graph results and the ITU-T pass mask can be viewed on the

JITTER

display.

RESULTS

SCALE [WIDE] provides a vertical axis range of +5 dB to -60 dB and is recommended for viewing the high frequency portion of the graph as this allows a clearer view of the difference between the actual result and the ITU-T pass mask.

SCALE [NARROW] provides a vertical axis range of +3 dB to -3 dB and is recommended for viewing the low frequency portion of the graph as this allows a clearer view of the difference between the actual result and the ITU-T pass mask.

The graph on the display is cleared when is pressed but the display remains available.

RESULTS

TRANSMIT TRANSMIT

If the jitter transfer measurement is close to or exceeding the ITU-T pass mask in a particular area it may be desirable to Zoom in on the area of interest.

This is possible by viewing the TEXT results on the

TRANSFER FUNCTION

display or by using the USER mask capability of the HP

RESULTS

JITTER

37717C.

34

Jitter Testing

Selective Jitter Transfer Measurement

To use the USER mask capability select

TRANSMIT

SDH

JITTER and set up

the display as shown opposite. The user can enter F1, F2, F3, and F4 jitter

frequency points and A1 and A2 jitter amplitude values.

In this example the jitter transfer will be measured at 55 points between 50 kHz and 75 kHz, at amplitudes of 0.35 UI, 50 kHz to 65 kHz and 0.15 UI, 65 kHz to 75 kHz.

NOTE Before the measurement can be made the HP 37717C must be connected back to back

and a calibration performed. Press to start the Calibration.

RUN/STOP

1. Connect the HP 37717C to the network equipment.

2. Select JITTER, select MODE and press

RUN/STOP

TRANSMIT

MEASURE

.

SDH

The TEXT and GRAPH results can be viewed on the

RESULTS

JITTER

display. SCALE [NARROW] provides a vertical

axis range of +3 dB to -3 dB and is recommended for viewing the low frequency portion of the graph as this allows a clearer view of the difference between the actual result and the ITU-T pass mask.

The TEXT results can also be viewed.

35

Jitter Testing

In Service ATM Jitter

Options required:

• A3K [A3Q] - Jitter Generation

• PDH Module UKJ

• ATM Module UKN

Application

Receiver set to Live Trafﬁc, Jitter added in ATM THRU mode. Swept Mask used and network equipment checked for Alarms particularly OOF LOF.

Default (Known State) Settings

It can be advisable to set the HP 37717C to a known state prior to setting up to make a measurement. This clears all previous settings and provides a clearly deﬁned instrument state. The default settings are set by selecting

SETTINGS RECALL

STORED SETTING NUMBER 0 and pressing .

OTHER

STORED

Test Setup Procedure (In Service SDH Jitter)

In this set up the received ATM signal has Jitter added and is retransmitted via ATM THRU mode. The Swept Mask feature is used and the HP 37717C "sweeps" through the jitter mask, adjusting the jitter amplitude according to the jitter frequency. The network equipment alarms are monitored particularly OOF and LOF.

36

Jitter Testing

In Service ATM Jitter

Select PHYSICAL

RECEIVE

ATM

LAYER and set up the display as shown opposite.

TERMINATION and LINE CODE selections should match those of the network equipment.

Select PHYSICAL

TRANSMIT

ATM

LAYER and set up the display as shown opposite.

Run the Test (In Service ATM Jitter)

Select JITTER and set up

TRANSMIT

the display as shown opposite. When JITTER MASK [SWEPT] is

selected the HP 37717C will "sweep" through the jitter mask adjusting amplitude according to the Jitter frequency.

Monitor the network alarms

37

Jitter Testing

In Service ATM Jitter

38

3

3 Result Deﬁnitions

.

Result Deﬁnitions

Jitter Results

The following Jitter Hits and Jitter Amplitude results are provided. In addition Wander results are provided at 2 Mb/s.

Table 3-1 Jitter Results

Result Description

+ve PEAK Highest value of positive Jitter during measurement period.

-ve PEAK Highest value of negative Jitter during measurement period. PEAK-PEAK Highest value of pk_pk Jitter during measurement period. HIT COUNT Number of times received jitter exceeds a user deﬁned threshold. HIT SECONDS Number of seconds which contain at least 1 jitter hit.

Table 3-2 Wander Results

Result Description

+ve PEAK Cumulative amount of positive Wander during measurement period.

-ve PEAK Cumulative amount of negative Wander during measurement

PEAK-PEAK Cumulative amount of pk_pk Wander during measurement period. PEAK-PEAK (15 MIN) Cumulative amount of pk_pk Wander during 15 Minute period. PEAK-PEAK (24 HOURS) Cumulative amount of pk_pk Wander during 24 Hour period. TIME INTERVAL ERROR Cumulative ESTIMATED BIT SLIPS Cumulative count of Bit Slips during measurement Period. ESTIMATED FRAME SLIPS Cumulative count of Frame Slips during measurement Period.

40

period.

4

4 Jitter Logging Messages

.

Jitter Logging Messages

Logging Devices

Results may be logged to the Disc Drive. A bit map of graphics results can be recorded on the disk drive by using the screen dump feature.

If Remote Control Option A3X is ﬁtted, results may be logged to the Intrenal Printer.

If Remote Control Option A3B or A3D, is ﬁtted the following types of External printer can be used for results logging:

• HP-IB HP 550C DeskJet printer

• RS-232-C HP 550C DeskJet printer

• An alternative suppliers RS-232-C printer

The alternative suppliers RS-232-C printer can be 40 column width or 80 column width. If a 40 column width printer is used Graphics results cannot be logged.

• A Centronics parallel printer

Results Logging

Header and results are logged to the selected device when:

PRINT NOW

• is pressed.

• If LOGGING [ON] is selected on the display and a

measurement is started by pressing

|==============================================================================| | Hewlett Packard HP37717C | | Instrument Configuration | |------------------------------------------------------------------------------| | RECEIVER | | Receive Signal : 34 Mb/s Termination : 75 Ohm UNBAL | | Linecode : HDB3 Payload : FRAMED | | Payload Type : UNFRAMED | | Pattern : 2^23-1 Polarity : INVERTED | | Hit Threshold : 0.70 Filter : OFF | | Range : 1.6 UI RMS Filter : 12 kHZ HP | | | | MEASUREMENT STARTED 23 Jul 97 13:42:49 Print Period 10 Minutes |

|------------------------------------------------------------------------------|

Logging Header

42

OTHER

RUN/STOP

LOGGING

Jitter Logging Messages

Results Logging

If is pressed the cumulative results are logged. If a measurement is in

PRINT NOW

progress the current results are logged. If a measurement is not in progress the cumulative results for the last measurement are logged.

During the Measurement Period

If LOG ERROR SECOND [ON] is selected on the LOGGING display all occurrences of an Error Second will be logged:

• Bit

• Code (PDH)

• Frame (PDH)

• CRC (PDH)

• REBE (PDH)

• DS3 Frame (SDH)

• DS3 P-Bit (SDH)

• DS3 C-Bit (SDH)

• DS3 FEBE (SDH)

• DS1 Frame (SDH)

• DS1 CRC6 (SDH)

• A1A2 FRAME (SDH)

• RS B1 BIP/B1 BIP (SDH)

• MS B2 BIP/B2 BIP (SDH)

• MS FEBE/RS REI (SDH)

OTHER

• Path B3 BIP/B3 BIP (SDH)

• Path FEBE/HP REI (SDH)

• Path IEC/HP IEC (SDH)

• TU Path BIP (SDH)

• TU Path FEBE/LP REI (SDH)

• Hit Count (Jitter)

• Hit seconds (Jitter)

• Positive Peak Amplitude (Jitter)

43

Jitter Logging Messages

Results Logging

• Negative Peak Amplitude (Jitter)

• Peak to Peak Amplitude (Jitter)

• RMS Amplitude (Jitter)

• Positive Peak (2Mb/s Wander)

• Negative Peak (2Mb/s Wander)

• Peak to Peak (2Mb/s Wander)

• Peak to Peak (15 min) (2Mb/s Wander)

• Peak to Peak (24 hours) (2Mb/s Wander)

• Time Interval Error (2Mb/s Wander)

• Estimated Bit Slips (2Mb/s Wander)

• Estimated Frame Slips (2Mb/s Wander)

• EM BIP (ATM)

• FEBE/REI (ATM)

• Corrected HEC (ATM)

• Non Corrected HEC (ATM)

• Cell Loss (ATM)

• Errored Cells (ATM)

• Misinserted Cells (ATM)

All Alarm occurrences will be logged both when set and cleared:

• Signal Loss

• AIS (PDH & ATM)

• Pattern Sync Loss (PDH & ATM)

• Loss Of Frame (SDH, PDH & ATM)

• Out Of Frame (SDH)

• Multiframe (PDH)

• Remote Loss (PDH)

44

Jitter Logging Messages

Results Logging

• Remote Multiframe Loss (PDH)

• Loss of Pointer (SDH)

• MS AIS (SDH)

• Path AIS/AU AIS (SDH)

• Pattern Loss (SDH)

• Clock Loss (SDH)

• MS FERF/MS RDI (SDH)

• Path FERF/HP RDI (SDH)

• K1K2 Change (SDH)

• H4 Multiframe Loss (SDH)

• TU Loss of Pointer (SDH)

• TU AIS (SDH)

• TU Path FERF/LP RDI (SDH)

• DS3 Frame Loss (SDH)

• DS3 AIS (SDH)

• DS3 FERF (SDH)

• DS1 Frame Loss (SDH)

• DS1 AIS (SDH)

• DS1 FERF (SDH)

• Jitter Lock Loss (Option UHN[US9])

• Excess Jitter (Option UHN[US9])

• Excess Wander (Option UHN[US9])

• Wander Ref Loss (Option UHN[US9])

• Wander Signal Loss (Option UHN[US9])

• FERF/RDI (ATM)

• Loss of Cell Sync (ATM)

• Selected Cell Not Received (ATM)

• Congestion Experienced (ATM)

45

Jitter Logging Messages

Results Logging

• Test Cell Loss (ATM)

• VP AIS (ATM)

• VP FERF/VP RDI (ATM)

• VC AIS (ATM)

• VC FERF/VC RDI (ATM)

In addition the following events are logged:

• All Alarms Clear

• Power Failure

• Power Restored

• New Day

• Squelched - Printing stopped to conserve paper during period of Unavailability

• Unsquelched - Printing restarted after period of Unavailability

• Print Demanded - if is pressed.

• Print Period - if selected on display.

PRINT NOW

OTHER

LOGGING

• Printing Enabled - if Printer enabled during a measurement.

• Measurement Complete

46

Jitter Logging Messages

Results Logging

Logging During Measurement Example

47

Jitter Logging Messages

Results Logging

At the End of the Measurement Period

A complete set of measurement results are logged.

48

Jitter Logging Messages

Results Logging

Logging At End of Measurement Example

Bar Graph Logging

To log the Bar Graphs: On the display, LOGGING SETUP , select the

required logging device under LOGGING PORT . On the CONTROL display, select LOGGING [ON] . Display the Bar Graphs required on the Bar Graph display and press . Select . The Error Summary, the Alarm Summary, the selected Bar Graphs and the Alarms

Graph are logged.

OTHER

LOGGING DEVICE

LOGGING

THIS SCREEN

PRINT

49

Jitter Logging Messages

Results Logging

Bar Graph Logging Example

Graphics Text Results Logging

To log the Alarm Summaries: Select the required logging device under LOGGING PORT on the

LOGGING

Select LOGGING [ON] on the display.

display.

OTHER

LOGGING

Display the results required on the Text Results display and press . The Error Summary and Alarm Summary are logged.

50

OTHER

PRINT

Jitter Logging Messages

Results Logging

Results Snapshot Logging

To log the Results Snapshot: Select the required External logging device under LOGGING PORT on the

OTHER

LOGGING

Select LOGGING [ON] on the display.

display.

OTHER

LOGGING

Select LOG ON DEMAND [RESULTS] on the display

and press .

|==============================================================================| | Hewlett Packard HP37717C | | Instrument Configuration | |------------------------------------------------------------------------------| | RECEIVER | | Receive Signal : 34 Mb/s Termination : 75 Ohm UNBAL | | Linecode : HDB3 Payload : FRAMED | | Payload Type : UNFRAMED | | Pattern : 2^23-1 Polarity : INVERTED | | Hit Threshold : 0.70 Filter : OFF | | Range : 1.6 UI RMS Filter : 12 kHZ HP | | | | MEASUREMENT STARTED 23 Jul 97 13:50:21 Print Period 10 Minutes | |------------------------------------------------------------------------------| |==============================================================================| | 13:52:58 PRINT DEMANDED- RESULTS SNAPSHOT Elapsed Time 00d 00h 02m 36s| |==============================================================================| | Cumulative Results | | | | Error Results : | | FAS 140M FAS 34M FAS 8M FAS 2M | | Error Count N/A 0 N/A N/A | | Error Ratio N/A 0 N/A N/A | | | | BIT (test) CODE CRC REBE | | Error Count 0 0 N/A N/A | | Error Ratio 0 0 N/A N/A | | | | JITTER | | Hit Count 32966 | | Hit Seconds 102 | | Hit Free Seconds 54 | | Positive Peak 0.740 | | Negative Peak 0.746 | | Peak-to-Peak 1.486 | | RMS 0.004 | | | | Analysis Results : | | G.821 ANALYSIS | | BIT (test) FAS 140M FAS 34M FAS 8M FAS 2M | | Errored Sec 0 N/A 0 N/A N/A | | %Errored Sec 0.00000 N/A 0.00000 N/A N/A | | %ES (Annex D) 0.00000 N/A N/A N/A N/A | | Error Free Sec 156 N/A 156 N/A N/A | | %Error Free Sec 100 N/A 100 N/A N/A | | Severely Err Sec 0 N/A 0 N/A N/A | | %Severely Err Sec 0.00000 N/A 0.00000 N/A N/A | | Degraded Minutes 0 N/A 0 N/A N/A | | %Degraded Minutes 0.00000 N/A 0.00000 N/A N/A |

PRINT NOW

OTHER

LOGGING

51

Jitter Logging Messages

Results Logging

Results Snapshot Logging Example

52

Jitter Logging Messages

Results Logging

Jitter Auto Tolerance Results Logging

To log the Jitter Auto tolerance plot and results from which the Auto Tolerance plot is constructed.

On the display, select LOGGING SETUP and

OTHER

LOGGING DEVICE

select the required logging device under LOGGING PORT . On the display, select LOGGING SETUP and

OTHER

LOGGING CONTROL

set LOGGING [ON] . On the display:

RESULTS

for PDH Jitter: select RESULTS ; , select or as

required, and press .

JITTER

PRINT NOW

AUTO TOLER

TEXT GRAPH

for SDH Jitter: select RESULTS ; , select or as required,

and press .

SDH

PRINT NOW

AUTO TOLER

TEXT GRAPH

53

Jitter Logging Messages

Results Logging

Jitter Transfer Logging

To log the Jitter Transfer plot and results from which the Jitter Transfer plot is constructed.

On the display, select LOGGING SETUP and

OTHER

LOGGING DEVICE

select the required logging device under LOGGING PORT . On the display, select LOGGING SETUP and

OTHER

LOGGING CONTROL

set LOGGING [ON] . select RESULTS ; , select or

JITTER

as required, and press .

TRANSFER FUNCTION

PRINT NOW

TEXT GRAPH

54

5

5 Jitter Self Test Error Codes

.

Jitter Self Test Error Codes

When self test is run fail numbers may be displayed. The fail numbers and a description are listed below.

Table 5-1 Processor Self Test

No. Description No. Description

1020 SRAM Error 1021 SRAM Error 1022 SRAM Error 1023 SRAM Error 1024 SRAM Adress Error 1040 RS232 DCD 1041 RS232 R1 1042 RS232 DSR 1043 RS232 CTS 1044 RS232 Rx too many bytes 1045 RS232 Tx time out 1046 RS232 Rx too few bytes 1047 RS232 Tx/Rx Data t 1052 HP-IB Driver Chip 1060 Real Time Clock Set Incorrectly 1061 Real Time Clock Not Ticking correctly 1070 Parallel Port No Send Data 1080 Internal Printer 1081 Keyboard Processor Internal RAM 1082 Keyboard Processor External RAM 1083 Keyboard Processor ROM 1084 Front Panel No Response 1085 Front Panel Bad Command 1086 Front Panel Invalid Error Returned 1087 Front Panel CPU or UART 1088 Cannot Detect Front Panel Printer 1090 VRAM Data Error 1100 No Disk in Drive 1101 Disk Full 1102 Disk Write Fail 1103 Disk Read Fail 1104 Disk Verify Read/Write Fail 1110 LAN Failed Power-On Test 1111 LAN Returned Invalid Error Number 1112 LAN Hardware Not Found 1113 Lan Fitted No Test Result 1120 Front Panel No Response 1121 Front Panel Bad Command 1122 Front Panel Returned Invalid Error Number 1123 Dual Port SRAM Data Error 1124 Dual Port SRAM Address Error 1130 Front Panel No Response 1131 Front Panel Bad Command 1132 Front Panel Returned Invalid Error Number 1133 Front Panel FEPROM Sum-check Error 1140 Front Panel No Response 1141 Front Panel Bad Command 1142 Front Panel Returned Invalid Error Number 1143 Front Panel SRAM Data Error 1144 Front Panel SRAM Address Error 1145 Front Panel Address Range Invalid 1150 Front Panel No Response 1151 Front Panel Bad Command 1152 Front Panel Returned Invalid Error Number 1153 Front Panel VRAM Data Error 1154 Front Panel Stored Fonts Corrupted

56

Jitter Self Test Error Codes

Table 5-1 Processor Self Test

No. Description No. Description

1155 Front Panel Address Range Invalid 1156 Front Panel VGA Controller Error 1160 Front Panel No Response 1161 Front Panel Bad Command 1162 Front Panel Returned Invalid Error Number 1163 Front Panel UART Tx/Rx Error Internal 1164 Front Panel Internal Loopback not Reset 1166 Front Panel UART Tx/Rx Error External

Table 5-2 JITTER Generator Tests

No. Description No. Description

1411 140 Mb/s PDH, 2 kHz - Errors 1419 140 Mb/s PDH, 2 kHz - VCO not Settling 1421 140 Mb/s PDH, 5 kHz - Errors 1431 34 Mb/s PDH, 2 kHz - Errors 1439 34 Mb/s PDH, 2 kHz - VCO not Settling 1441 34 Mb/s PDH, 5 kHz - Errors 1452 34 Mb/s PDH, 100 kHz - No Errors 1461 8 Mb/s PDH, 2 kHz - Errors 1469 8 Mb/s PDH, 2 kHz - VCO not Settling 1471 8 Mb/s PDH, 5 kHz - Errors 1482 8 Mb/s PDH, 50 kHz - No Errors 1491 2 Mb/s PDH, 2 kHz - Errors 1499 2 Mb/s PDH, 2 kHz - VCO not Settling 14102 2 Mb/s PDH, 5 kHz - No Errors 14111 140 Mb/s SDH, 2 kHz - Errors 14121 140 Mb/s SDH, 5 kHz - Errors

Table 5-3 JITTER Receiver Tests

No. Description No. Description

14133 Intrinsic Jitter 140 Mb/s, PRBS - Result Low 14134 Intrinsic Jitter140 Mb/s, PRBS - Result High 14138 Intrinsic Jitter 140 Mb/s, PRBS - Jitter Unlock 14139 Intrinsic Jitter140 Mb/s - VCO not Settling 14143 Intrinsic Jitter 140 Mb/s, All 0’s - Result Low 14144 Intrinsic Jitter140 Mb/s, All 0’s - Result High 14148 Intrinsic Jitter 140 Mb/s, All 0’s - Jitter Unlock 14153 Intrinsic Jitter140 Mb/s, 1000 - Result Low 14154 Intrinsic Jitter 140 Mb/s, 1000 - Result High 14158 Intrinsic Jitter140 Mb/s, 1000 - Jitter Unlock 14163 Intrinsic Jitter 140 Mb/s, All 1’s - Result Low 14164 Intrinsic Jitter140 Mb/s, All 1’s - Result High

57

Jitter Self Test Error Codes

Table 5-3 JITTER Receiver Tests

No. Description No. Description

14168 Intrinsic Jitter 140 Mb/s, All 1’s - Jitter Unlock 14173 Intrinsic Jitter34 Mb/s, PRBS - Result Low 14174 Intrinsic Jitter 34 Mb/s, PRBS - Result High 14178 Intrinsic Jitter 140 Mb/s,PRBS - Jitter Unlock 14179 Intrinsic Jitter 34 Mb/s - VCO not Settling 14183 Intrinsic Jitter 34 Mb/s, All 0’s - Result Low 14184 Intrinsic Jitter 34 Mb/s, All 0’s - Result High 14188 Intrinsic Jitter 34 Mb/s,All 0’s - Jitter Unlock 14193 Intrinsic Jitter 34 Mb/s, 1000 - Result Low 14194 Intrinsic Jitter34 Mb/s, 1000 - Result High 14198 Intrinsic Jitter 34 Mb/s, 1000 - Jitter Unlock 14203 Intrinsic Jitter 34 Mb/s,All 1’s - Result Low 14204 Intrinsic Jitter 34 Mb/s, All 1’s - Result High 14208 Intrinsic Jitter 34 Mb/s,All 1’s - Jitter Unlock 14213 Intrinsic Jitter 8 Mb/s, PRBS - Result Low 14214 Intrinsic Jitter8 Mb/s, PRBS - Result High 14218 Intrinsic Jitter 8 Mb/s, PRBS - Jitter Unlock 14219 Intrinsic Jitter8 Mb/s - VCO not Settling 14223 Intrinsic Jitter 8 Mb/s, All 0’s - Result Low 14224 Intrinsic Jitter8 Mb/s, All 0’s - Result High 14228 Intrinsic Jitter 8 Mb/s, All 0’s - Jitter Unlock 14233 Intrinsic Jitter 8 Mb/s,0001 - Result Low 14234 Intrinsic Jitter 8 Mb/s, 1000 - Result High 14238 Intrinsic Jitter 8 Mb/s,1000 - Jitter Unlock 14243 Intrinsic Jitter 8 Mb/s, All 1’s - Result Low 14244 Intrinsic Jitter8 Mb/s, All 1’s - Result High 14248 Intrinsic Jitter 8 Mb/s, All 1’s - Jitter Unlock 14253 Intrinsic Jitter 2 Mb/s,PRBS - Result Low 14254 Intrinsic Jitter 2 Mb/s, PRBS - Result High 14258 Intrinsic Jitter 2 Mb/s,PRBS - Jitter Unlock 14259 Intrinsic Jitter 8 Mb/s, - VCO not Settling 14263 Intrinsic Jitter 2 Mb/s,All 0’s - Result Low 14264 Intrinsic Jitter 2 Mb/s, All 0’s - Result High 14268 Intrinsic Jitter 2 Mb/s,All 0’s - Jitter Unlock 14273 Intrinsic Jitter 2 Mb/s, 1000 - Result Low 14274 Intrinsic Jitter2 Mb/s, 1000 - Result High 14278 Intrinsic Jitter 2 Mb/s, 1000 - Jitter Unlock 14283 Intrinsic Jitter 2 Mb/s,All 1’s - Result Low 14284 Intrinsic Jitter 2 Mb/s, All 1’s - Result High 14288 Intrinsic Jitter 2 Mb/s,All 1’s - Jitter Unlock

Table 5-4 JITTER Back to Back Tests

No. Description No. Description

14293 140 Mb/s, 0 UI, 10 Hz - Result Low 14294 140 Mb/s, 0 UI, 10 Hz - Result High 14298 140 Mb/s, 0 UI, 10 Hz - Jitter Unlock 14299 140 Mb/s - VCO not Settling 14303 140 Mb/s, 10 UI, 100 Hz - Result Low 14304 140 Mb/s, 10 UI, 100 Hz - Result High 14308 140 Mb/s, 10 UI, 100 Hz - Jitter Unlock 14313 140 Mb/s, 1 UI, 10 kHz - Result Low 14314 140 Mb/s, 1 UI, 10 kHz - Result High 14318 140 Mb/s, 1 UI, 10 kHz - Jitter Unlock 14323 140 Mb/s, 0.6 UI, 3 MHz - Result Low 14324 140 Mb/s, 0.6 UI, 3 MHz - Result High

58

Jitter Self Test Error Codes

Table 5-4 JITTER Back to Back Tests

No. Description No. Description

14328 140 Mb/s, 0.6 UI, 3 MHz - Jitter Unlock 14333 34 Mb/s, 0 UI, 10 Hz - Result Low 14334 34 Mb/s, 0 UI, 10 Hz - Result High 14338 34 Mb/s, 0 UI, 10 Hz - Jitter Unlock 14339 34 Mb/s - VCO not Settling 14343 34 Mb/s, 10 UI, 100 Hz - Result Low 14344 34 Mb/s, 10 UI, 100 Hz - Result High 14348 34 Mb/s, 10 UI, 100 Hz - Jitter Unlock 14353 34 Mb/s, 1 UI, 200 kHz - Result Low 14354 34 Mb/s, 1 UI, 200 kHz - Result High 14358 34 Mb/s, 1 UI, 200 kHz - Jitter Unlock 14363 34 Mb/s, 0.6 UI, 500 kHz - Result Low 14364 34 Mb/s, 0.6 UI, 500 kHz - Result High 14368 34 Mb/s, 0.6 UI, 500 kHz - Jitter Unlock 14373 8 Mb/s, 0 UI, 10 Hz - Result Low 14374 8 Mb/s, 0 UI, 10 Hz - Result High 14378 8 Mb/s, 0 UI, 10 Hz - Jitter Unlock 14379 8 Mb/s - VCO not Settling 14383 8 Mb/s, 10 UI, 100 Hz - Result Low 14384 8 Mb/s, 10 UI, 100 Hz - Result High 14388 8 Mb/s, 10 UI, 100 Hz - Jitter Unlock 14393 8 Mb/s, 1 UI, 100 kHz - Result Low 14394 8 Mb/s, 1 UI, 100 kHz - Result High 14398 8 Mb/s, 1 UI, 100 kHz - Jitter Unlock 14403 8 Mb/s, 0.6 UI, 300 kHz - Result Low 14404 8 Mb/s, 0.6 UI, 300 kHz - Result High 14408 8 Mb/s, 0.6 UI, 300 kHz - Jitter Unlock 14413 2 Mb/s, 0 UI, 10 Hz - Result Low 14414 2 Mb/s, 0 UI, 10 Hz - Result High 14418 2 Mb/s, 0 UI, 10 Hz - Jitter Unlock 14419 2 Mb/s - VCO not Settling 14423 2 Mb/s, 10 UI, 100 Hz - Result Low 14424 2 Mb/s, 10 UI, 100 Hz - Result High 14428 2 Mb/s, 10 UI, 100 Hz - Jitter Unlock 14433 2 Mb/s, 1 UI, 25 kHz - Result Low 14434 2 Mb/s, 1 UI, 25 kHz - Result High 14438 2 Mb/s, 1 UI, 25 kHz - Jitter Unlock 14443 2 Mb/s, 0.6 UI, 80 kHz - Result Low 14444 2 Mb/s, 0.6 UI, 80 kHz - Result High 14448 2 Mb/s, 0.6 UI, 80 kHz - Jitter Unlock

Table 5-5 STM-1 Electrical JITTER Receiver Tests

No. Description No. Description

14493 Intrinsic Jitter, Range 1_6, PRBS - Result Low 14494 Intrinsic Jitter,Range 1_6, PRBS - Result High 14496 Intrinsic Jitter Range 1_6, PRBS - Loss of Signal 14498 Intrinsic Jitter Range 1_6, PRBS - Jitter Unlock 14499 Intrinsic Jitter Range 1_6, PRBS - VCO not

Settling 14504 Intrinsic Jitter, Range 1_6, All 0’s - Result High 14506 Intrinsic Jitter, Range 1_6, All 0’s - Loss of Signal 14508 Intrinsic Jitter, Range 1_6, All 0’s - Jitter Unlock 14513 Intrinsic Jitter Range 1_6, All 1’s - Result Low

14503 Intrinsic Jitter Range 1_6, All 0’s - Result Low

59

Jitter Self Test Error Codes

Table 5-5 STM-1 Electrical JITTER Receiver Tests

No. Description No. Description

14514 Intrinsic Jitter, Range 1_6, All 1’s - Result High 14516 Intrinsic Jitter, Range 1_6, All 1’s - Loss of Signal 14518 Intrinsic Jitter, Range 1_6, All 1’s - Jitter Unlock 14523 Intrinsic Jitter Range 16, PRBS - Result Low 14524 Intrinsic Jitter, Range 16, PRBS - Result High 14526 Intrinsic Jitter,Range 16, PRBS - Loss of Signal 14528 Intrinsic Jitter, Range 16, PRBS - Jitter Unlock 14533 Intrinsic Jitter Range 16, All 0’s - Result Low 14534 Intrinsic Jitter, Range 16, All 0’s - Result High 14536 Intrinsic Jitter,Range 16, All 0’s - Loss of Signal 14538 Intrinsic Jitter, Range 16, All 0’s - Jitter Unlock 14543 Intrinsic Jitter Range 16, All 1’s - Result Low 14544 Intrinsic Jitter, Range 16, All 1’s - Result High 14546 Intrinsic Jitter, Range 16, All 1’s - Loss of Signal 14548 Intrinsic Jitter, Range 16, All 1’s - Jitter Unlock 14553 Jitter Off - Result Low 14554 Jitter Off - Result High 14556 Jitter Off - Loss of Signal 14558 Jitter Off - Jitter Unlock 14563 Jitter 5 UI, 100 Hz - Result Low 14564 Jitter 5 UI, 100 Hz - Result High 14566 Jitter 5 UI, 100 Hz - Loss of Signal 14568 Jitter 5 UI, 100 Hz - Jitter Unlock 14573 Jitter 5 UI, 1 kHz - Result Low 14574 Jitter 5 UI, 1 kHz - Result High 14576 Jitter 5 UI, 1 kHz - Loss of Signal 14578 Jitter 5 UI, 1 kHz - Jitter Unlock 14583 Jitter 1 UI, 10 kHz - Result Low 14584 Jitter 1 UI, 10 kHz - Result High 14586 Jitter 1 UI, 10 kHz - Loss of Signal 14588 Jitter 1 UI, 10 kHz - Jitter Unlock 14593 Jitter 1 UI, 100 kHz - Result Low 14594 Jitter 1 UI, 100 kHz - Result High 14596 Jitter 1 UI, 100 kHz - Loss of Signal 14598 Jitter 1 UI, 100 kHz - Jitter Unlock 14603 Jitter 0.5 UI, 1 MHz - Result Low 14604 Jitter 0.5 UI, 1 MHz - Result High 14606 Jitter 0.5 UI, 1 MHz - Loss of Signal 14608 Jitter 0.5 UI, 1 MHz - Jitter Unlock 14613 Jitter Hits 1 UI - Result Low 14614 Jitter Hits 1 UI - Result High 14616 Jitter Hits 1 UI - Loss of Signal 14618 Jitter Hits 1 UI - Jitter Unlock

60

Jitter Self Test Error Codes

Table 5-6 STM-4 Optical JITTER Receiver Tests

No. Description No. Description

14753 Intrinsic Jitter, Range 1_6, PRBS - Result Low 14754 Intrinsic Jitter,Range 1_6, PRBS - Result High 14757 Intrinsic Jitter Range 1_6, PRBS - Loss of Light 14758 Intrinsic Jitter Range 1_6, PRBS - Jitter Unlock 14763 Intrinsic Jitter Range 1_6, All 0’s - Result Low 14764 Intrinsic Jitter Range 1_6, All 0’s - Result High 14767 Intrinsic Jitter, Range 1_6, All 0’s - Loss of Light 14768 Intrinsic Jitter, Range 1_6, All 0’s - Jitter Unlock 14773 Intrinsic Jitter Range 1_6, All 1’s - Result Low 14774 Intrinsic Jitter, Range 1_6, All 1’s - Result High 14777 Intrinsic Jitter, Range 1_6, All 1’s - Loss of Light 14778 Intrinsic Jitter, Range 1_6, All 1’s - Jitter Unlock 14783 Intrinsic Jitter Range 16, PRBS - Result Low 14784 Intrinsic Jitter, Range 16, PRBS - Result High 14787 Intrinsic Jitter,Range 16, PRBS - Loss of Light 14788 Intrinsic Jitter, Range 16, PRBS - Jitter Unlock 14793 Intrinsic Jitter Range 16, All 0’s - Result Low 14794 Intrinsic Jitter, Range 16, All 0’s - Result High 14797 Intrinsic Jitter,Range 16, All 0’s - Loss of Light 14798 Intrinsic Jitter, Range 16, All 0’s - Jitter Unlock 14803 Intrinsic Jitter Range 16, All 1’s - Result Low 14804 Intrinsic Jitter, Range 16, All 1’s - Result High 14807 Intrinsic Jitter, Range 16, All 1’s - Loss of Light 14808 Intrinsic Jitter, Range 16, All 1’s - Jitter Unlock 14813 Jitter Off - Result Low 14814 Jitter Off - Result High 14817 Jitter Off - Loss of Light 14818 Jitter Off - Jitter Unlock 14823 Jitter 5 UI, 100 Hz - Result Low 14824 Jitter 5 UI, 100 Hz - Result High 14827 Jitter 5 UI, 100 Hz - Loss of Light 14828 Jitter 5 UI, 100 Hz - Jitter Unlock 14833 Jitter 5 UI, 1 kHz - Result Low 14834 Jitter 5 UI, 1 kHz - Result High 14837 Jitter 5 UI, 1 kHz - Loss of Light 14838 Jitter 5 UI, 1 kHz - Jitter Unlock 14843 Jitter 1 UI, 10 kHz - Result Low 14844 Jitter 1 UI, 10 kHz - Result High 14847 Jitter 1 UI, 10 kHz - Loss of Light 14848 Jitter 1 UI, 10 kHz - Jitter Unlock 14853 Jitter 1 UI, 100 kHz - Result Low 14854 Jitter 1 UI, 100 kHz - Result High 14857 Jitter 1 UI, 100 kHz - Loss of Light 14858 Jitter 1 UI, 100 kHz - Jitter Unlock 14863 Jitter 0.5 UI, 1 MHz - Result Low 14864 Jitter 0.5 UI, 1 MHz - Result High 14867 Jitter 0.5 UI, 1 MHz - Loss of Light 14868 Jitter 0.5 UI, 1 MHz - Jitter Unlock 14873 Jitter Hits 1 UI - Result Low 14874 Jitter Hits 1 UI - Result High 14877 Jitter Hits 1 UI - Loss of Light 14878 Jitter Hits 1 UI - Jitter Unlock

61

Jitter Self Test Error Codes

Table 5-7 STM-1 Optical JITTER Receiver Tests

No. Description No. Description

14753 Intrinsic Jitter, Range 1_6, PRBS - Result Low 14754 Intrinsic Jitter,Range 1_6, PRBS - Result High 14757 Intrinsic Jitter Range 1_6, PRBS - Loss of Light 14758 Intrinsic Jitter Range 1_6, PRBS - Jitter Unlock 14763 Intrinsic Jitter Range 1_6, All 0’s - Result Low 14764 Intrinsic Jitter Range 1_6, All 0’s - Result High 14767 Intrinsic Jitter, Range 1_6, All 0’s - Loss of Light 14768 Intrinsic Jitter, Range 1_6, All 0’s - Jitter Unlock 14773 Intrinsic Jitter Range 1_6, All 1’s - Result Low 14774 Intrinsic Jitter, Range 1_6, All 1’s - Result High 14777 Intrinsic Jitter, Range 1_6, All 1’s - Loss of Light 14778 Intrinsic Jitter, Range 1_6, All 1’s - Jitter Unlock 14783 Intrinsic Jitter Range 16, PRBS - Result Low 14784 Intrinsic Jitter, Range 16, PRBS - Result High 14787 Intrinsic Jitter,Range 16, PRBS - Loss of Light 14788 Intrinsic Jitter, Range 16, PRBS - Jitter Unlock 14793 Intrinsic Jitter Range 16, All 0’s - Result Low 14794 Intrinsic Jitter, Range 16, All 0’s - Result High 14797 Intrinsic Jitter,Range 16, All 0’s - Loss of Light 14798 Intrinsic Jitter, Range 16, All 0’s - Jitter Unlock 14803 Intrinsic Jitter Range 16, All 1’s - Result Low 14804 Intrinsic Jitter, Range 16, All 1’s - Result High 14807 Intrinsic Jitter, Range 16, All 1’s - Loss of Light 14808 Intrinsic Jitter, Range 16, All 1’s - Jitter Unlock 14813 Jitter Off - Result Low 14814 Jitter Off - Result High 14817 Jitter Off - Loss of Light 14818 Jitter Off - Jitter Unlock 14823 Jitter 5 UI, 100 Hz - Result Low 14824 Jitter 5 UI, 100 Hz - Result High 14827 Jitter 5 UI, 100 Hz - Loss of Light 14828 Jitter 5 UI, 100 Hz - Jitter Unlock 14833 Jitter 5 UI, 1 kHz - Result Low 14834 Jitter 5 UI, 1 kHz - Result High 14837 Jitter 5 UI, 1 kHz - Loss of Light 14838 Jitter 5 UI, 1 kHz - Jitter Unlock 14843 Jitter 1 UI, 10 kHz - Result Low 14844 Jitter 1 UI, 10 kHz - Result High 14847 Jitter 1 UI, 10 kHz - Loss of Light 14848 Jitter 1 UI, 10 kHz - Jitter Unlock 14853 Jitter 1 UI, 100 kHz - Result Low 14854 Jitter 1 UI, 100 kHz - Result High 14857 Jitter 1 UI, 100 kHz - Loss of Light 14858 Jitter 1 UI, 100 kHz - Jitter Unlock 14863 Jitter 0.5 UI, 1 MHz - Result Low 14864 Jitter 0.5 UI, 1 MHz - Result High 14867 Jitter 0.5 UI, 1 MHz - Loss of Light 14868 Jitter 0.5 UI, 1 MHz - Jitter Unlock 14873 Jitter Hits 1 UI - Result Low 14874 Jitter Hits 1 UI - Result High 14877 Jitter Hits 1 UI - Loss of Light 14878 Jitter Hits 1 UI - Jitter Unlock

62

Jitter Self Test Error Codes

Table 5-8 RMS JitterTests (Options A3L, A3V, A3N)

No. Description No. Description

14145 140 Mb/s, All 0’s - Result Low 14146 140 Mb/s, All 0’s - Result High 14185 34 Mb/s, All 1’s - Result Low 14186 34 Mb/s, All 1’s - Result High 14225 8 Mb/s, All 1’s - Result Low 14226 8 Mb/s, All 1’s - Result High 14265 2 Mb/s, All 1’s - Result Low 14266 2 Mb/s, All 1’s - Result High 14315 140 Mb/s, 1 UI, 10 kHz - Result Low 14316 140 Mb/s, 1 UI, 10 kHz - Result High 14355 34 Mb/s, 1 UI, 200 kHz - Result Low 14356 34 Mb/s, 1 UI, 200 kHz - Result High 14395 8 Mb/s, 1 UI, 100 kHz - Result Low 14396 8 Mb/s, 1 UI, 100 kHz - Result High 14435 2 Mb/s, 1 UI, 25 kHz - Result Low 14436 2 Mb/s, 1 UI, 25 kHz - Result High 14495 STM-1 E, PRBS23 - Result Low 14496 STM-1 E, PRBS23 - Result High 14595 STM-1 E, 1 UI, 10 kHz - Result Low 14596 STM-1 E, 1 UI, 10 kHz - Result High 14625 STM-1 Opt, All 1’s - Result Low 14626 STM-1 Opt, All 1’s - Result High 14725 STM-1 Opt, 1 UI, 10 kHz - Result Low 14726 STM-1 Opt, 1 UI, 10 kHz - Result High 14755 STM-4, All 0’s - Result Low 14756 STM-4, All 0’s - Result High 14855 STM-4,1 UI, 10 kHz - Result Low 14856 STM-4,1 UI, 10 kHz - Result High

63

Jitter Self Test Error Codes

Table 5-9 JITTER Back to Back Tests (Opt A3K)

No. Description No. Description

14881 2 Mb/s, 80 UI, 100 Hz - Errors 14889 2 Mb/s, 80 UI, 100 Hz - VCXO not Settling 14893 2 Mb/s, 13 UI, 100 Hz - Result Low 14894 2 Mb/s, 13 UI, 100 Hz - Result High 14898 2 Mb/s, 13 UI, 100 Hz - Jitter Unlock 14899 2 Mb/s, 13 UI, 100 Hz - VCXO not Settling 14902 2 Mb/s, 20 UI, 100 Hz - Overrange not Detected 14908 2 Mb/s, 20 UI, 100 Hz - Jitter Unlock 14909 2 Mb/s, 20 UI, 100 Hz - VCXO not Settling 14911 140 Mb/s, 50 UI, 100 Hz - Errors 14923 STM-1E, 13 UI, 100 Hz - Result Low 14924 STM-1E, 13 UI, 100 Hz - Result High 14928 STM-1E, 13 UI, 100 Hz - Jitter Unlock 14929 STM-1E, 13 UI, 100 Hz - VCXO not Settling 14933 STM-1O, 13 UI, 100 Hz - Result Low 14934 STM-1O, 13 UI, 100 Hz - Result High 14938 STM-1O, 13 UI, 100 Hz - Jitter Unlock 14939 STM-1O, 13 UI, 100 Hz - VCXO not Settling 14943 STM-4, 12 UI, 100 Hz - Result Low 14944 STM-4, 12 UI, 100 Hz - Result High 14948 STM-4, 12 UI, 100 Hz - Jitter Unlock 14949 STM-4, 12 UI, 100 Hz - VCXO not Settling

64

Index

A

Automatic Jitter Transfer, 5

B

Bar Graph Logging, 49 Bit error threshold, 6

D

Delay Time, 32 Delay time, 6 Desynchroniser Stress, 18 Dwell Time, 6

G

Graphics

Bar Graph Logging, 50 Logging Bar Graphs, 49

I

In Service ATM Jitter, 36 In Service SDH Jitter, 24

J

Jitter & Wander Generator, 6 Jitter and Wander Generation, 6 Jitter Auto Tolerance Logging, 53 Jitter Introduction, 2 Jitter Measurement

PDH & STM-1, 4 PDH & STM-1E, 3 PDH, STM-1 & STM-4, 5

Jitter Tolerance Test

SPDH, 9

Unstructured PDH, 9 Jitter Transfer Logging, 54 Jitter Transfer Measurement, 29

L

Logging At End of Measuremen, 49 Logging Bar Graphs, 50 Logging Devices, 42 Logging During Measurement, 47 Logging Header, 42 Logging Messages, ??–12, ??–12, ??–53,

??–53, ??–54

Logging Results

At end of Measurement, 48

Bar Graphs, 48

During Measurement, 43 Error & Alarm Summaries, 50 Graphics Text, 50 Jitter Auto Tolerance, 53 Jitter Autotolerance, 53 Jitter Transfer, 54 Logging Header, 42 Result Snapshot, 51

M

Multiplexer Jitter Tolerance, 8

O

Option A3K, 6

P

PDH, 3 PDH Tests, Option UKK (75W Unbal

Back to Back), 56

Q

Q Factor, 6

R

Results Definitions

Jitter, 40 Wander, 40

Results Snapshot Logging Example, 52

S

SDH Jitter Tolerance, 21 Selective Jitter Transfer Measurement, 29 Slips and Wander, 13 Stored Text Results Logging, 51

T

Text Results Logging, 51 Tributary Mapping Jitter, 26 Tributary Mapping Jitter Test, 27

W

Wander and Slips, 13 Wander and Slips Test, 14 Wander Generator, 6 Wander modulation, 6 Wander Results, 40

65

Index

66

Hewlett-Packard Sales and Service Offices

United States:

Hewlett-Packard Company 2101 Gaither Road Rockville MD 20850 (301) 258-2000

Hewlett-Packard Company 5201 Tollview Drive Rolling Meadows IL 60008 (708) 255-9800

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Hewlett-Packard Company 2000 South Park Place Atlanta GA 30339 (404) 955-1500

Japan:

Yokogawa-Hewlett-Packard Ltd. Measurement Assistance Center 9-1, Takakura-Cho Hachioji-Shi Tokyo 192 Japan (81) 426 48 0722

Latin America:

Hewlett-Packard Latin America Region Headquarters 5200 Blue Lagoon Drive 9th Floor Miami Florida 33126 USA (305) 267 4245/4220

Australia/New Zealand:

Canada:

Hewlett-Packard Canada Ltd. 5150 Spectrum Way Mississauga Ontario L4W 5G1 (416) 206-4725

Europe:

Hewlett-Packard European Marketing Centre PO Box 999 1180 AZ Amstelveen The Netherlands

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Far East:

Hewlett-Packard Paciﬁc Ltd. 22-30/F Peregrine Tower Lippo Centre 89 Queensway Central Hong Kong (852) 848 7070

Learning Products Map

:All of the learning products which apply to the HP 37717C Communications Performance Analyzerare shown below:

Quick Start Guide - 37717-90255

The Quick Start Guide demonmstrates the basic methods of instrument operation. This guide tells you how to select the displays that you want and how to use them to modify the instrument functions. This guide also tells you about the front panel key functions, the indicators and the connectors.

Users Manual - 37717-90256

The Users Manual tells you how to make the selections you want to set up the instrument.

Concept Guides

The concept guides provide descriptions of the instrument features, default settings, application ideas, result definitions, logging messages and self test fail codes. The concept guides supplied are: PDH Concept Guide- 37717-90257 SDH Concept Guide - 37717-90252 Jitter Concept Guide - 37717-90258 ATM Concept Guide - 37717-90259

Remote Control Manual - 37717-90290:

Provides remote control information for instruments fitted with the RS232 and HP-IB remote control option modules.

Calibration Manual - 37717-90289:

Provides specifications and methods of testing that the instrument meets its specifications.

About This Edition

This is the 1st edition of the 37717-90258 manual. It documents the product as of July 1997. Edition dates are as follows:

1st Edition, July 1997  Copyright Hewlett-

Packard Ltd. 1997.

In This Book

This book provides information on HP 37717C modules with Jitter capability. It also provides applications associated with these modules. The individual applications contain techniques which may be of value for purposes other than those shown

Printed in U.K. 07/97 37717-90258

Double-click here to deﬁne book introduction head

drawings/a1m.tif @ 150 dpi 3 drawings/a1pa.tif @ 150 dpi 4 drawings/a1pa.tif @ 150 dpi 5 drawings/a3k.tif @ 300 dpi 6 drawings/sjittol.tif @ 300 dpi 9 drawings/jittol.tif @ 300 dpi 9 drawings/p17mm14a.tif @ 300 dpi 10 drawings/jitt24.tif @ 300 dpi 10 drawings/p17mm11a.tif @ 300 dpi 10 drawings/p17mm15a.tif @ 300 dpi 11 drawings/p14mm67.tif @ 150 dpi 11 drawings/p14mm68.tif @ 300 dpi 11 drawings/p14mm68po.tif @ 150 dpi 11 drawings/wander.tif @ 300 dpi 14 drawings/jit80.tif @ 300 dpi 14 drawings/p14mm57a.tif @ 300 dpi 14 drawings/jit81.tif @ 300 dpi 15 drawings/wan1.tif @ 300 dpi 15 drawings/p14mm61.tif @ 300 dpi 16 drawings/p14mm61po.tif @ 150 dpi 16 drawings/desync.tif @ 300 dpi 19 drawings/p17mm66.tif @ 300 dpi 19 drawings/p17mm67.tif @ 300 dpi 19 drawings/p17mm68.tif @ 300 dpi 20 drawings/jitt28.tif @ 300 dpi 20 drawings/p17mm69.tif @ 300 dpi 20 drawings/jitt11.tif @ 300 dpi 22 drawings/jitt12.tif @ 300 dpi 22 drawings/jitt13a.tif @ 300 dpi 23 drawings/jitt21.tif @ 150 dpi 23 drawings/jitt22.tif @ 300 dpi 23 drawings/jitt22po.tif 23

DRAFT 71

Double-click here to deﬁne book introduction head

drawings/jitt14.tif @ 300 dpi 25 drawings/jitt15.tif @ 300 dpi 25 drawings/jitt16.tif @ 300 dpi 25 drawings/jitt81.tif @ 300 dpi 26 drawings/jitt17.tif @ 300 dpi 28 drawings/jitt18.tif @ 300 dpi 28 drawings/jitt19.tif @ 300 dpi 28 drawings/sdh50.tif @ 300 dpi 31 drawings/jit71.tif @ 300 dpi 31 ../../../hpsqfch/37717b/frame/JITTMOD/jitt72.tif @ 150 dpi 31 drawings/jit73.tif @ 300 dpi 31 drawings/jit61.tif @ 300 dpi 32 drawings/jitt76.tif @ 150 dpi 32 drawings/jit65.tif 33 drawings/jit68po.xwd 33 drawings/calmeas.xwd 33 drawings/jit70.tif @ 300 dpi 34 drawings/jit70po.xwd @ 300 dpi 34 drawings/jit69.tif @ 300 dpi 34 drawings/jit69po.xwd 34 drawings/jit77.tif @ 300 dpi 35 drawings/jit78.tif @ 300 dpi 35 drawings/jit78po.xwd 35 drawings/calmeas.xwd 35 drawings/jit79.tif @ 300 dpi 35 drawings/jit79po.xwd @ 300 dpi 35 drawings/jitt20.tif @ 300 dpi 37 drawings/jitt23.tif @ 300 dpi 37 drawings/jitt25.tif @ 300 dpi 37 drawings/gen41.tif @ 150 dpi 50 drawings/bc90258.tif @ 132 dpi 70

72 DRAFT

Agilent 37717C Jitter Concept Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Introduction to Jitter Testing

Introduction to Jitter

Option A3K [A3Q] Jitter & Wander Generator

2 Jitter Testing

Multiplexer Jitter Tolerance

Wander and Slips

Desynchroniser Stress

SDH Jitter Tolerance

In Service SDH Jitter

Tributary Mapping Jitter

Selective Jitter Transfer Measurement

In Service ATM Jitter

Jitter Results

4 Jitter Logging Messages

Logging Devices

Results Logging

During the Measurement Period

At the End of the Measurement Period

Bar Graph Logging

Graphics Text Results Logging

Results Snapshot Logging

Jitter Auto Tolerance Results Logging

Jitter Transfer Logging

5 Jitter Self Test Error Codes