Agilent 37718A Users Guide

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HP 37718A Communications Performance Analyzer

User’s Guide DSn/SONET Operation

 Copyright HewlettPackard Ltd.1998

HP Part No. 37718-90004

First edition, 09/98 Printed in U.K.

Warranty

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

Hewlett-Packardmakes no warranty of any kindwithregardto this material, including, but not limited to, the implied warranties or merchantability and ﬁtness for a particular purpose.

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

WARNING

WarningSymbols Used on the Product

The product is marked with this symbol when the usershould 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 tothe laser safety information in the Calibration Manual.

Hewlett-Packard Limited Telecommunications Networks Test Division South Queensferry West Lothian, Scotland EH30 9TG

User’s Guide DSn/SONET Operation

HP 37718A Communications Performance Analyzer

About This Book

This book tells you how to select the features that you want to use for your test.

The selections available are presented in the following groups:

• Transmit and receive interfaces

• Testfeatures,forexample,theaddition oferrors andalarmsto thetest

signal

• Measurements including test timing

• Storing, logging and printing results with general printer information

• Using instrument and disk storage

• Using the “Other” features.

The selections available will depend on the options ﬁtted to your instrument. The examples given in this book cover all options and therefore may include selections which are not available on your instrument.

Contents

1 Setting the Interfaces

Setting DSn Transmit Interface 10 Setting SONET Transmit Interface 12 Setting SONET THRU Mode 15 Using Smart Test 17 Setting DSn Receive Interface 19 Setting SONET Receive Interface 21

2 Selecting Test Features

Using Transmit Overhead Setup 24 Using Receive Overhead Monitor 26 Setting Overhead Trace Messages 28 Generating Overhead Sequences 29 Using Receive Overhead Capture 31 Adding Frequency Offset to SONET Signal 33 Adding Frequency Offset to the DSn Signal 35 Setting up Signaling Bits 36 Setting Transmit Structured Payload/Test Signal 39 Setting Receive Structured Payload/Test Signal 41 Setting Transmit N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal 42 Setting Receive N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal 44 Inserting an External DSn Payload/Test Signal 45 Dropping an External Payload/Test Signal 48 Adding Errors & Alarms at the SONET Interface 51 Adding Errors & Alarms to the DSn Interface/DSn Payload 52 Using FEAC Codes 53

Contents

Setting DSn Spare Bits 55 Adding Pointer Adjustments 56 Using Pointer Graph Test Function 63 Stressing Optical Clock Recovery Circuits 65 Generating Automatic Protection Switch Messages 66 Inserting & Dropping Data Communications Channel 67

3 Making Measurements

Using Overhead BER Test Function 70 Test Timing 71 Making SONET Analysis Measurements 72 Making DSn Analysis Measurements 73 Measuring Frequency 74 Measuring Optical Power 75 Measuring Round Trip Delay 76 Monitoring Signaling Bits 78 Measuring Service Disruption Time 79 Performing a SONET Tributary Scan 82 Performing an SONET Alarm Scan 84 Performing a DSn Alarm Scan 85

4 Storing, Logging and Printing

Saving Graphics Results to Instrument Store 88 Recalling Stored Graph Results 89 Viewing the Bar Graph Display 91 Viewing the Graphics Error and Alarm Summaries 93

Contents

Logging Graph Displays 95 Logging Results 97 Logging on Demand 100 Logging Results to Parallel (Centronics) Printer 102 Logging Results to HP-IB Printer 103 Logging Results to Internal Printer 104 Logging Results to RS-232-C Printer 105 Printing Results from Disk 106 Connecting an HP DeskJet Printer to a Parallel Port 107 Changing Internal Printer Paper 108 Cleaning Internal Printer Print Head 111

5 Using Instrument and Disk Storage

Storing Conﬁgurations in Instrument Store 114 Titling Conﬁguration in Instrument Store 115 Recalling Conﬁgurations from Instrument Store 116 Formatting a Disk 117 Labeling a Disk 118 Managing Files and Directories on Disk 119 Saving Graphics Results to Disk 126 Saving Data Logging to Disk 128 Saving Conﬁgurations to Disk 129 Recalling Conﬁguration from Disk 130 Recalling Graphics Results from Disk 131 Copying Conﬁguration from Instrument Store to Disk 132 Copying Conﬁguration from Disk to Instrument Store 134 Copying Graphics Results from Instrument Store to Disk 136

vii

Contents

6 Selecting and Using "Other" Features

Coupling Transmit and Receive Settings 140 Setting Time & Date 141 Enabling Keyboard Lock 142 Enabling Beep on Received Error 143 Suspending Test on Signal Loss 144 Setting Error Threshold Indication 145 Setting Screen Brightness and Color 146 Dumping Display to Disk 147 Running Self Test 149

7 STS-1 SPE Background Patterns

8 ETSI/ANSI Terminology

ETSI/ANSI Conversion and Equivalent Terms 156

viii

1 Setting the Interfaces

This chapter tells you how to set the instrument interfaces to match the network being tested.

Setting the Interfaces

Setting DSn Transmit Interface

Description DSn transmit interface settings should match network equipment

settings of Rate, Termination and Line Code and determine the Payload to be tested.

TIP: To set the Transmitter and Receiver to the same interface settings

choose .

OTHER

SETTINGS CONTROL COUPLED

HOW TO: 1 Choose the required SIGNAL rate.

Rates of DS1, DS3, 2 Mb/s and 34 Mb/s are available.

2 Choose the required CLOCK SYNC (clock synchronization source). 3 If DS1 or DS3 is chosen, choose the required interface level. 4 If you have chosen 2 Mb/s as the SIGNAL rate, choose the required

TERMINATION. (At all other signal rates the impedance is ﬁxed).

5 If you have chosen 2 Mb/s or DS1 as the SIGNAL rate, choose the

required LINE CODE. (At 34 Mb/s and DS3 coding is ﬁxed.)

Setting the Interfaces

Setting DSn Transmit Interface

6 If required, choose the FREQUENCY OFFSET value.

See “Adding Frequency Offset to SONET Signal” page 33.

7 Choose the required PAYLOAD TYPE.

If STRUCTURED is required FRAMED must be chosen. IfStructuredis chosenthe DSntest signalmustbe setup. See“Setting Transmit Structured Payload/Test Signal” page 39. If you have chosen 2 Mb/s, DS1 or DS3 as the DSn signal rate, the Framed choice is expanded to provide a menu of framing types.

8 Choose the PATTERN type and the PRBS POLARITY.

Setting the Interfaces

Setting SONET Transmit Interface

Description SONET transmit interface settings should match the network

equipment settings of Rate, Wavelength and Mapping, determine the payload to be tested and set background conditions to prevent alarms while testing.

TIP: If you wish to set the HP 37718A transmitter and receiver to the same

interface settings choose .

OTHER

SETTINGS CONTROL COUPLED

HOW TO: 1 Make your choice of SIGNAL rate.

If Option106, Dual Wavelengthopticalmodule, isﬁttedand anoptical rate is chosen, choose the required wavelength (1550) or (1310). If STS-1 is chosen, choose the required interface level. ChooseINTERNALunless THRUMODEis required.If THRU MODE is chosen, see "Setting SONET THRU Mode " page 15.

2 Make your choice of CLOCK synchronization source. The RECEIVE

clock sync choice depends on the SONET Receive Interface choice. EXTERNAL allows a choice of MTS, BITS or 10 MHz clocks.

3 If required choose the FREQUENCY OFFSET value. See “Adding

Frequency Offset to SONET Signal” page 33.

Setting the Interfaces

Setting SONET Transmit Interface

4 Choose FOREGROUND , BACKGROUND

B/G MAPPING

MAPPING and type of payload.

F/G MAPPING

Mapping may beselectedfroma pictorial display by moving the cursor to MAPPING and pressing .

SET

Use and to move betweenSTSLayer choice, VTLayerchoice and Payload Layer choice. Use and to choose the mapping.

SET

Use to conﬁrm your choice and return to the

MAIN SETTINGS

display.

SONET

5 If VT-6 mapping is chosen, VT CONCATENATION selection is

enabled, choose OFF or the tributary at which the concatenation begins, VT6-2C through VT6-6C. The BACKGROUND, PATTERN IN OTHER VT-6’s is ﬁxed at NUMBERED, that is, each VT-6 contains a unique number to allow identiﬁcation in case of routing problems.

6 If required, choose DS1/2M/34M/DS3 OFFSET value. See “Adding

Frequency Offset to SONET Signal” page 33

7 If FULL SPE, VT-6, VT-2orVT-1.5mapping is chosen, choose the test

tributary CHANNEL,including the STS-3foran OC-12/OC-48 signal.

8 Choose the payloadframingunder PAYLOAD TYPE or VTPAYLOAD.

If STRUCTURED is required FRAMED must be chosen. If STRUCTURED is chosen, the Payload test signal must be set up. See “Setting Transmit Structured Payload/Test Signal” page 39. If INSERT is chosen, see “Inserting an External DSn Payload/Test Signal” page 45.

Setting the Interfaces

Setting SONET Transmit Interface

If you have chosen 2 Mb/s, DS1 or DS3 under Mapping, the Framed choice is expanded to provide a menu of framing types.

9 Choose the PATTERN type and PRBS polarity.

10 Choose the mapping required in the background (non-test) STS’s. 11 If VT mapping is chosen for the test STS, choose the PATTERN IN

OTHER VT’s.

Setting the Interfaces

Setting SONET THRU Mode

Description THRU mode is used to non-intrusively monitor SONET lines where no

protected monitor points are available. As THRU mode locks some user settings, you must set SIGNAL RATE, STS rate, STS-1 SPE CHANNEL (if appropriate) before selecting THRU mode. The entire frame can be errorred at a user deﬁned rate if PAYLOAD OVERWRITE and TOH+POH CHANNEL OVERWRITE are both set to OFF. If either overwrite is enabled the ENTIRE FRAME ERROR RATE function is disabled.

OC-1/STS-1, OC-3/STS-3

You can substituteanewpayload, Section and Line Overhead (TOH) and Path overhead (POH) in the received OC-1/STS-1 or OC-3/STS-3 signal for testing.

OC-12, OC-48

The overhead and payload may be overwritten for STS-3c SPE and AU3. PAYLOAD OVERWRITE is not available for STS-12C or STS-48C. TOH+POH CHANNEL overwrite is available for STS-12C and STS-48C.

HOW TO:

1 Make the required SIGNAL RATE, MAPPING and CHANNEL

choices on the SONET and displays, See

"Setting SONET Transmit Interface " page 12 and "Setting SONET

Receive Interface " page 21.

TRANSMIT

RECEIVE

Setting the Interfaces

Setting SONET THRU Mode

2 Make the PAYLOAD OVERWRITE choice required.

If STS-3cSPE, STS-1 SPE,VT-6,VT-2or VT-1.5ischosen, the Section, Line and Path CVs are recalculated before transmission and the Mapping, Selected VT, VT Payload, Pattern, Tributary Offset and Pattern in other VT’s settings are displayed. To choose the settings in these, See "Setting SONET Transmit Interface " page 12, steps 4 through 10.

3 Make the TOH+POH CHANNEL OVERWRITE choice required.

You canonlymodify those overhead bytes available under

SONET TEST FUNCTION SONET

: Errors & Alarms, Sequences,

TRANSMIT

Overhead BER, APS Messages and DCC Insert. The Section, Line and PathCVs are recalculated before transmission.

Setting the Interfaces

Using Smart Test

Description The SmartTest functioncanhelp speed-up conﬁguring the instrument in

two ways. 1 A Smartsetup feature that will attempt to conﬁgure the instrument

to receive the incoming signal.

2 A series of “links” that provide quick access to some of the most

frequently used features of the instrument. Note that these tests are run with the instrument in its current conﬁguration, no attempt is made to set the instrument to the requirements of the test.

Smartsetup can help the user by attempting to identify the incoming signal structure and detect mixed payload signal structures.

HOW TO USE SMARTSETUP:

1 Connect the HP 37718A to the network and choose if necessary the

SET

RECEIVE

SELECT

required SONET interface on the HP 37718A (Smartsetup will select DSn or SONET/SDH, but can not select between SONET and SDH).

2 Press .

The display will show the Smart Test menu above.

3 Press either or .

SMART TEST

Setting the Interfaces

Using Smart Test

4 In SONET mode the incoming signal will be identiﬁed on the top line

of the display,andunder this the payload mappings, the J1 Trace and C2 byte indicators are displayed on the bottom lines.

5 Use the and keys to display the J1 Trace informationforeach

STS SPE. When the STS SPE of interest has been identiﬁed choose either or .

VIEW PAYLOAD PRBS SEARCH

6 Choosing will identify and display the payload

VIEW PAYLOAD

mapping of the TUG structured signal, as shown below. Choose the required tributary using and .

7 There are four choices available at this point:

SETUP RX TROUBLE SCAN

tributary,exits tothe displayandstarts

which sets the receiver to receive the selected tributary.

which sets the receiver to receive the selected

RESULTS

TROUBLE SCAN

gating.

VIEW LABELS

which displaystheC2/V5/J1/J2 trace information for

the selected tributary.

TOP LEVEL

which returns the display to the STS SPE selection

window.

8 Choosing at Step 5 will prompt you for additional

PRBS SEARCH

information about patterns and which mapping to search. When the required data has been entered press .

9 When the search is complete a tributary display appears, with any

tributariescontainingthe required PRBSindicated with a“P”. Choose the required tributary using and .

Setting the Interfaces

Setting DSn Receive Interface

Description DSn Receive interface settings should match the network equipment

settings of Rate, Termination and Line Code and determine the Payload to be tested.

TIP: To set the transmitter and receiver to the same interface settings choose

OTHER

SETTINGS CONTROL COUPLED

HOW TO: 1 Choose the required SIGNAL rate.

2 If you have chosen 2 Mb/s as the SIGNAL rate, choose the required

TERMINATION. (At all other rates the impedance is ﬁxed.)

3 If you have chosen 2 Mb/s or DS1 as the SIGNAL rate, choose the

required LINE CODE. (At 34Mb/s and DS3 coding is ﬁxed.)

4 If you are measuring at the networkequipmentmonitorpoint,set the

LEVEL ﬁeld to MONITOR. In this case the received signal will be 20 to 30 dB below the normal level. Choose the GAIN required to return the received signal to normal. Choose EQUALIZATION to compensate for cable losses if required.

Setting the Interfaces

Setting DSn Receive Interface

5 Choose the PAYLOAD TYPE.

If STRUCTURED is required FRAMED must be chosen. If STRUCTURED is chosen, the DSn test signal must be set up. See “Setting Transmit Structured Payload/Test Signal” page 39. If you chose 2 Mb/s, DS1 or DS3 as the DSn/DSn SIGNAL rate, the FRAMED choice is expanded to provide a menu of framing types.

6 Choose the PATTERN type and the PRBS POLARITY required.

Setting the Interfaces

Setting SONET Receive Interface

Description SONET Receive interface settings should match the network equipment

settings of Rate and Mapping, and determine the payload to be tested.

TIP: If you wish to set the HP 37718A transmitter and receiver to the same

interface settings, choose .

OTHER

SETTINGS CONTROL COUPLED

HOW TO: 1 Choose the required SIGNAL source.

If STS-1 or STS-3 is chosen, choose the required LEVEL. If the LEVEL chosen is MONITOR choose the required GAIN.

2 Choose mapping and type of payload. 3 If VT-6mapping is chosen, andCONCATENATIONisenabled, choose

the tributary at which the concatenation begins. If VT-6, VT-2 or VT-1.5 mapping is chosen, choose the test tributary under CHANNEL.

4 Choose the payloadframingunder PAYLOAD TYPE or VTPAYLOAD.

If STRUCTURED is required FRAMED must be chosen. IfSTRUCTUREDis chosenthePayloadtest signal mustbe set up.See “Setting Receive Structured Payload/Test Signal” page 41. If DROP is chosen, see “Dropping an External Payload/Test Signal” page 48.

5 Choose the PATTERN type and PRBS polarity.

Setting the Interfaces

Setting SONET Receive Interface

2 Selecting Test Features

Selecting Test Features

Using Transmit Overhead Setup

Description You can set an overhead byte to a known static state to aid

troubleshooting, for example to quickly check for "stuck bits" in path overhead bytes. Transport Overhead, Path Overhead, Trace Messages and Labels can be set using this feature.

HOW TO: 1 Set up the SONET transmit interface and payload required. See

"Setting SONET Transmit Interface " page 12.

2 Choose the type of overhead to SETUP.

If OC-12 or OC-48 is chosen as the SONET interface, choose the STS3# and STS-1# you wish to set up. If STS-3 is chosen as the SONET interface, choose the STS-1# you wish to set up. DEFAULT - Use to set all overhead bytes to the standard values deﬁned by ITU-T. If a test function is active then the overhead byte value is determined by the choices made in the Test Function. If APS Messages is chosen, for example, K1K2 value is set by the APS Messages setup.

Selecting Test Features

Using Transmit Overhead Setup

If (Transport Overhead) is chosen, choose the STS-1 to be

TOH

displayed.Manybytes in and areunlabeledas the

STS-1# 2 STS-1#3

other overhead functions have not yet been deﬁned. If is chosen, the hexadecimal value of all 81 bytes of the

STS-1# 1,2,3

STS-3 section & line overhead selected are displayed (all 324 bytes of an OC-12 or 1,296 bytes ofanOC-48are displayed 81 bytes at a time by selecting each STS-3 in turn). The value of the bytes can be set

using .

DECREASE DIGIT INCREASE DIGIT

If BYTE NAMES is chosen, the labels for the overhead

STS-1# 1,2,3

bytes are displayed.

3 If POH (Path Overhead) is chosen, choose the TYPE of overhead

within STS-1 under test to be setup. J1 and J2 bytes can be set under Path Overhead or Trace Messages. H4 byte has a choice of sequences for VT-2, VT-1.5 and VT-6 mapping:

Full Sequence - 48 byte binary sequence. Reduced Sequence - Binary count sequence of 0 to 3 i.e. 111111(00

to 11). COC1 Sequence - Binary count sequence of 0 to 3 i.e. 110000(00 to

11). H4 byte is transmitted as all zero’s for 34 Mb/s and DS3.

4 If TRACE MESSAGES is chosen, see "Setting Overhead Trace

Messages " page 28.

NOTE Any bit of an overhead byte which is displayed as x or s cannot be set at

any time. All other bits can be set to 0 or 1.

TIP: You can set all overhead bytes to the default state by selecting SETUP

DEFAULT

You can set all overhead bytes and test functions to the default state by recalling Stored Settings [0] on the display.

OTHER

Selecting Test Features

Using Receive Overhead Monitor

Description When ﬁrst connecting to a SONET network, a start up conﬁdence check

can be made by viewing the behavior of all the overhead bytes. If the SONET network shows alarm indications,somediagnosisoftheproblem may be gained from viewing all the overhead bytes.The OVERHEAD MONITOR display is updated once per second (once per 8000 frames) approximately.

TIP: A snapshot of the received overhead can be logged to the chosen logging

device. See "Logging on Demand " page 100.

HOW TO: 1 Set up the receive SONET interface and payload as required. See

“Setting SONET Receive Interface” page 21.

2 Choose the type of overhead to MONITOR. 3 If (Transport Overhead) is chosen, choose the STS-3 # and

TOH

STS-1# to be displayed. Manybytes in and areunlabeled becausethe other overhead functions have not yet been deﬁned. If is chosen, the hexadecimal value of all 81 bytes of

STS-1# 1,2,3

section overhead isdisplayed(all 324 bytes of anOC-12or1,296 bytes of an OC-48 are displayed 81 bytes at a time by selecting eachSTS-3 in turn).The value of the bytes can be set using

INCREASE DIGIT

STS-1# 2 STS-1#3

DECREASE DIGIT

Selecting Test Features

Using Receive Overhead Monitor

If BYTE NAMES is chosen, the labels for the overhead

STS-1# 1,2,3

bytes are displayed.

4 If POH (Path Overhead) is chosen, choose the source of the overhead,

SPE or VTSPE. J1 and J2 bytes can be monitored under Path Overhead or Trace Messages

5 If TRACE MESSAGES is chosen, you can monitor a data message to

verify portions of the network. If the 16 byte CRC7 message structure is detected, the 15 characters within the message are displayed. If the CRC7 structure is not detected in J1, the 64 byte message format is assumed and displayed. If the CRC7 structure is not detected for J0 or J2, all 16 bytes are displayed.

6 If LABELS is chosen, the S1 sync status, STS path label (C2) and the

VT Path label (V5) are monitored.

7 If APS MESSAGES is chosen, choose the TOPOLOGY, (GR-

253) or (GR-1230). The K1 and K2 bits are monitored.

RING

LINEAR

TIP: If any abnormal behavior is observed on a particular path or section

overhead byte, or an associated group of bytes (3XA1,3XA2; D1 - D3), the

RECEIVE

TEST FUNCTION

display of can be

OVERHEAD CAPTURE

used to "Zoom" in on the suspect byte or bytes on a frame by frame basis. See "Using Receive Overhead Capture " page 31.

Selecting Test Features

Setting Overhead Trace Messages

Description You can insert a data message to verify portions of the network:

J0 veriﬁes the section overhead. J1 veriﬁes the STS-1 SPE or STS-3c SPE path connection. J2 veriﬁes the VT SPE path connection.

HOW TO: 1 Choose the message for insertion in the chosen trace channel.

ChoosingLABELSin TRACE MESSAGESallows the settingof the S1 SYNC STATUS, STS PATH LABEL (C2) and VT PATH LABEL (V5).

Selecting Test Features

Generating Overhead Sequences

Description You may insert a pattern into a functional group of overhead bytes for

testing or troubleshooting purposes.

HOW TO: 1 Set up the SONET transmit interface and payload required. See

“Setting SONET Transmit Interface” page 12.

2 Choose the type of sequence required.

SINGLE RUN - runs the sequence once and then stops. REPEAT RUN - runs the sequence repeatedly until STOPPED is chosen.

3 Choose the overhead type as required.

SOH- Section Overhead LOH- Line Overhead POH - Path Overhead

4 Choose the byte or bytes of overhead required. 5 Set up the required number of data patterns and the number of

frames in which each data pattern should appear. Yoursequence isderivedfrom upto 5blocksof hexadecimaldata. Each block can be transmitted in up to 64,000 frames. The data and the number of frames are set using

INCREASE DIGIT

DECREASE DIGIT

Selecting Test Features

Generating Overhead Sequences

6 Start the sequence by choosing .

START

NOTE Whenyou start thesequenceillustrated, one Outof Frame alarmandone

Loss of Frame alarm should occur every eight seconds.

Selecting Test Features

Using Receive Overhead Capture

Description Section, Line and Path overhead provide network support functions,

responding dynamically to network conditions and needs. It is therefore useful to capture overhead activity on a frame by frame basis.

TIP: The Overhead Capture display can be logged to the chosen logging

device. See "Logging on Demand " page 100.

HOW TO: 1 Set up the receive SONET interface and payload as required. See

“Setting SONET Receive Interface” page 21.

2 Choose the overhead type as required.

SOH- Section Overhead LOH- Line Overhead

POH- Path Overhead 3 Choose the Byte or bytes of overhead to be captured. Choose the TRIGGER to determine the start point of the capture.

- starts immediately the capture is initiated. Can be used to

OFF

provide a frame by frame monitor of the chosen byte or bytes.

-captures activity after your speciﬁed overhead state has occurred.

Can be used for transient detection from a speciﬁed expected state.

Selecting Test Features

Using Receive Overhead Capture

ON NOT

- captures activityafterthe ﬁrst occurrence of adeviationfrom your speciﬁed overhead state. Can be used for transient detection from a speciﬁed expected state.

4 Up to 16 records of overhead state are provided. Each record will

represent between 1 and 64,000 frames. A capture is started by pressing CAPTURE and terminates when up to 16 records

START

havebeen captured.Thecapture canbe terminatedearlierby pressing CAPTURE .

STOP

Selecting Test Features

Adding Frequency Offset to SONET Signal

Description Frequency offset can be added to the SONET interface rate signal and to

the payload signal.

HOW TO: SONET Line Rate Offset

1 Choose the amount of frequency offset required.

You can set the Frequency Offset in the range -999 ppm to +999 ppm in1ppm stepsusing and . The amount of applied Frequency Offset can be varied while measurements are taking place. If the value of the SONET line rate offset chosen is sufﬁcient to cause the maximum stuff rate to be exceeded, the asynchronous payload is offset to prevent bit errors occurring and the maximum stuff rate is maintained. WhenFloatingByte 2 Mb/sischosen, in conjunction with SONET line rate offset, the chosen tributary will be offset as the line rate is offset. (No pointer movements).

DECREASE DIGIT INCREASE DIGIT

Selecting Test Features

Adding Frequency Offset to SONET Signal

Tributary Offset ±100 ppm

1 Choose the amount of tributary offset required.

You can set the Offset in the range -100 ppm to +100 ppm in 1 ppm steps using and .

DECREASE DIGIT INCREASE DIGIT

The amount of applied Frequency Offset can be varied while measurements are taking place. Tributary offset affects the stuff rate but does not cause pointer movements and can be used to test mapping jitter. If the combined valueofSONETlinerate offsetand tributaryoffset chosenis sufﬁcient to causethe maximum stuff ratetobe exceeded thepayloadis offset to prevent bit errors occurring and the maximum stuff rate is maintained.

Selecting Test Features

Adding Frequency Offset to the DSn Signal

Description You can add frequency offset to the interface DSn SIGNAL at all rates.

Frequency Offset can be added at preset ITU values or as User deﬁned values in the range ±100 ppm. The preset values change with the SIGNAL rate chosen as shown:

DS-1 (1.544 Mb/s) + 32 ppm −32 ppm 2 Mb/s (E1) + 50 ppm −50 ppm 34 Mb/s (E3) + 20 ppm −20 ppm DS-3 (44.736 Mb/s) + 20 ppm −20 ppm

HOW TO: 1 Choose the FREQUENCY OFFSET required.

2 If you choose USER OFFSET, you can set the frequency offset to be

between -100 ppm and +100 ppm in 1 ppm steps. Select the ﬁeld immediately below USER OFFSET and use

DECREASE DIGIT INCREASE DIGIT

frequency offset.(The amount of frequency offset can be varied while measurements are taking place.)

, , and to set the

Selecting Test Features

Setting up Signaling Bits

Description When transmitting 2.048 Mb/s signals with timeslot-16 CAS (PCM30 or

PCM30CRC) multiframing the state of A,B,C,D signaling bits can be set. The signaling bits of all timeslots are set to the user-deﬁned 4 bit value.

When transmitting a DS1 framed, structured signal the values of the A,B signaling bits for D4 and SLC-96 payloads, and A,B,C,D signaling bits for ESF payloads can be deﬁned.

HOW TO Transmit a 2 Mb/s signal with user-deﬁned signaling bits

DSn Operation

1 Choose on the display. 2 Choose SIGNAL and PAYLOAD TYPE or

PCM30CRC

PDH/DSn

2 Mb/s PCM30

on the display.

TRANSMIT

MAIN SETTINGS

3 If UNSTRUCTURED is chosen set the 2M CAS ABCD bits value on

the display.

MAIN SETTINGS

If STRUCTURED is chosen set the 2M CAS ABCD bits value on the

STRUCTURED SETTINGS

display.

Selecting Test Features

Setting up Signaling Bits

SONET Operation

1 Choose on the display

SONET

2 Choose MAPPING or and VT

PAYLOAD or on the display.

PCM30 PCM30CRC

TRANSMIT

ASYNC 2Mb/s FL BYTE 2Mb/s

MAIN SETTINGS

3 If UNSTRUCTURED is chosen set the 2M CAS ABCD bits value on

the display.

MAIN SETTINGS

If STRUCTURED is chosen set the 2M CAS ABCD bits value on the

STRUCTURED SETTINGS

display.

HOW TO Transmit a DS1 payload signal with user-deﬁned signaling bits

DSn Operation

1 Choose on the display.

PDH/DSn

TRANSMIT

Selecting Test Features

Setting up Signaling Bits

2 Choose SIGNAL or , and PAYLOAD TYPE

on the display

MAIN SETTINGS

3 Choose TEST SIGNAL or on the

SETTINGS

DS1 DS3

56 kb/s Nx56 kb/s

display.

STRUCTURED

4 Set the A,B bits (for D4 and SLC-96) and A,B,C,D bits (for ESF) as

required.

SONET Operation

1 Choose on the display.

SONET

2 Choose MAPPING or and VT PAYLOAD

STRUCTURED MAIN SETTINGS

on the display

3 Choose TEST SIGNAL or on the

SETTINGS

display .

TRANSMIT

ASYNC DS1

56 kb/s Nx56 kb/s

DS3

STRUCTURED

4 Set the A,B bits (for D4 and SLC-96) and A,B,C,D bits (for ESF) as

required.

Selecting Test Features

Setting Transmit Structured Payload/Test Signal

Description Structured DSn Payload/Test Signal settings determine the SONET

payload or the DSn test signal to be tested and set any background (non test) conditions to prevent alarms while testing.

TIP: If you wish to set the HP 37718A transmitter and receiver to the same

Payload settings, choose .

OTHER

SETTINGS CONTROL COUPLED

HOW TO: 1 Choose the required TEST SIGNAL rate. If Nx64 kb/s or N X 56 kb/s

is chosen, see "Setting Transmit N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal " page 42.

2 Choose the PAYLOAD framing pattern.

If TEST SIGNAL 2Mb/s is chosen is added to the PAYLOAD menu.See "Insertingan External DSnPayload/TestSignal " page 45. If TEST SIGNAL DS1 is chosen is added to the menu. See "Inserting an External DSn Payload/Test Signal " page 45.

3 Choosethetest tributaryin the structuredpayload, under34Mb, 8Mb,

2Mb, 64 kb/s or DS2, DS1, 56 kb/s.

4 Choose the PATTERN type and PRBS POLARITY.

INSERT 2 Mb/s

INSERT DS1

Selecting Test Features

Setting Transmit Structured Payload/Test Signal

5 Choose the B/G PATTERN.

The B/G PATTERN in the non test 56/64 kb/s timeslots is ﬁxed as NUMBERED,that is,each timeslotcontains auniquenumber toallow identiﬁcation in case of routing problems.

Signaling

6 If a 2 Mb/s PAYLOAD with PCM30 or PCM30CRC framing,or 56 kb/s

or Nx56kb/s Test Signal is chosen. See, "Setting up Signaling Bits " page 36.

Selecting Test Features

Setting Receive Structured Payload/Test Signal

Setting Receive StructuredPayload/Test Signal

Description Structured DSn Payload/Test Signal settings determine the SONET

payload or the DSn test signal to be tested.

TIP: If you wish to set the HP 37718A transmitter and receiver to the same

Payload settings, choose .

OTHER

STORED SETTINGS COUPLED

HOW TO: 1 Choose the required Test Signal rate. If N x 64 kb/s or N x 56 kb/s is

chosen, see "Setting Receive N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal " page 44.

2 Choose the Framing pattern of the PAYLOAD.

If TEST SIGNAL 2 Mb/s is chosen, is added to the menu. See "Dropping an External Payload/Test Signal " page 48. If TEST SIGNAL DS1 is chosen, is added to the menu. See "Dropping an External Payload/Test Signal " page 48.

3 Choose the test tributary within the structured payload,under34Mb,

8Mb, 2Mb, 64 kb or DS2, DS1, 56 kb/s.

4 Choose the PATTERN type and PRBS polarity.

DROP 2 Mb/s

DROP DS1

Selecting Test Features

Setting TransmitNx64kb/s/N x 56 kb/s Structured Payload/Test Signal

Setting Transmit N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal

Description Wideband services such as high speed data links and LAN

interconnection require a bandwidth greater than 56/64 kb/s but less than DS1/2 Mb/s for example 112 kb/s or 336 kb/s. These wideband signals are sent in a DS1/2 Mb/s frame by sharing the signal between multiple timeslots.

N x 64kb/s/N x 56 kb/s structured payload allows a test pattern to be inserted across a number of timeslots even if the chosen timeslots are non-contiguous.

HOW TO: 1 Choose the required Test Signal rate.

2 Choose the Framing pattern of the 2M or DS1 PAYLOAD. 3 Choose the test timeslots within the structured payload using

DESELECT ALL DESELECT SELECT

timeslot is selected, an * marks the chosen timeslot. In the example above Timeslots 3, 5, 9, 21, 22, 23 are selected for test.

4 Choose the PATTERN type and PRBS polarity. 5 Choose the B/G PATTERN.

and softkeys. As each

Selecting Test Features

Setting TransmitNx64kb/s/N x 56 kb/s Structured Payload/Test Signal

6 The B/G PATTERN in the non-test 56/64 kb/s timeslots is ﬁxed as

NUMBERED, that is, each timeslot contains a unique identiﬁcation number.

Signaling

7 If a 2 Mb/s PAYLOAD with PCM30 or PCM30CRC framing,or 56 kb/s

or Nx56kb/s Test Signal is chosen. See, "Setting up Signaling Bits " page 36.

Selecting Test Features

Setting Receive N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal

Description Wideband services such as high speed data links and LAN

interconnection require a bandwidth greater than 56/64 kb/s but less than DS1/2 Mb/s e.g. 112 kb/s or 336 kb/s. These wideband signals are sent in a DS1/2 Mb/s frame by sharing the signal between multiple timeslots.

N x 64kb/s andNx56kb/s structured payload/test signal allows the test Timeslots to be chosen for error measurement even when the Timeslots are non contiguous.

HOW TO: 1 Choose the required Test Signal rate.

2 Choose the Framing pattern of the 2M or DS1 PAYLOAD. 3 Choose the test timeslots within the structured payload using

DESELECT ALL DESELECT SELECT

timeslot is chosen an * marks the chosen timeslot. In the example above Timeslots 3, 5, 9, 21, 22, 23 are chosen for test.

4 Choose the PATTERN type and PRBS polarity.

and softkeys. As each

Selecting Test Features

Inserting an External DSn Payload/Test Signal

Description You can insert a DSn signal from external equipment into the SONET

signal, or you can insert2Mb/sor DS1 into the structured DSn signal, as shown in the table below. DS3 and 34 Mb/s can only be inserted if SONET is chosen as the receive interface. 2 Mb/s or DS1 can be inserted from a structured or non-structured SONET payload and from a structured DSn signal.

RATE Availability Option

DS3 SONET 011 Only 34Mb/s SONET 010 and 011 2Mb/s DSn & SONET 010 and 011 DS1 DSn & SONET 011 Only

HOW TO: Insert 34 Mb/s & DS3

1 Connect the external payload to the 75Ω IN port of the PDH/DSn

receive module.

2 Set up the required transmit SONET interface, and choose VT

PAYLOAD or as required.

INSERT 34 Mb/s

INSERT DS3

Selecting Test Features

Inserting an External DSn Payload/Test Signal

Insert 2 Mb/s or DS1 (Unstructured SONET Payload)

1 Connect the external payload to the MUX port of the PDH/DSn

Transmit module. If 2 Mb/s connect to 75ΩMUX port. If DS1 connect to 100Ω MUX port.

2 Set up the required transmit SONET interface, and choose VT-2 or

VT-1.5 MAPPING and VT PAYLOAD or .

INSERT 2 Mb/s

INSERT DS1

Insert 2 Mb/s or DS1 (Structured SONET Payload or Structured DSn)

1 Connect the external payload to the MUX port of the DSn Transmit

module. If 2 Mb/s connect to 75ΩMUX port. If DS1 connect to 100Ω MUX port.

Selecting Test Features

Inserting an External DSn Payload/Test Signal

Structured SONET Payload

2 Set up the required transmit SONET interface. See "Setting SONET

Transmit Interface " page 12.

3 Set up the SONET structured payload. See "Setting Transmit

Structured Payload/Test Signal " page 39.

4 Choose 2M PAYLOAD/DS1 PAYLOAD or

INSERT DS1

INSERT 2 Mb/s

5 Choose the LINE CODE.

Structured DSn

6 Set up, the required transmit DSn interface, See "Setting DSn

Transmit Interface " page 10.

7 Set up the DSn Test Signal interface. See "Setting Transmit

Structured Payload/Test Signal " page 39

8 Choose 2M PAYLOAD/DS1 PAYLOAD or

INSERT DS1

INSERT 2 Mb/s

9 Choose the LINE CODE.

Selecting Test Features

Dropping an External Payload/Test Signal

Description You can drop a DSn signal from the received payload or drop 2 Mb/s or

DS1 from the structured DSn signal to external equipment as shown in the table below. DS3 and 34 Mb/s can only be dropped if SONET is chosen as the receive interface. 2 Mb/s or DS1 can be dropped from a structured ornon-structuredSONETpayload and from astructuredDSn signal.

RATE Availability Option

DS3 SONET 011 Only 34Mb/s SONET 010 and 011 2Mb/s DSn & SONET 010 and 011 DS1 DSn & SONET 011 Only

HOW TO: Drop 34 Mb/s & DS3

1 Connect the 75Ω OUT port of the DSn Transmit module to the

external equipment.

2 Set up the receive SONET interface, and choose VT PAYLOAD,

DROP 34 Mb/s

If is chosen, choose the DS3 output level.

DROP DS3

or .

DROP DS3

Selecting Test Features

Dropping an External Payload/Test Signal

Drop 2 Mb/s /DS1 (Unstructured SONET Payload)

1 Connect the DEMUX port of the DSn module to the external

equipment.

2 Set up the required receive SONET interface, and choose VT-2 or

VT-1.5 MAPPING and VT PAYLOAD or .

DROP 2 Mb/s

DROP DS1

3 Choose the required LINE CODE.

Drop 2 Mb/s/DS1 (Structured SONET Payload or Structured DSn

1 Connect the DEMUX port of the Receive DSn module to the external

equipment. If 2 Mb/s connect to 75Ω DEMUX port. If DS1 connect to 100Ω DEMUX port.

Selecting Test Features

Dropping an External Payload/Test Signal

Structured SONET Payload

2 Set up the required receive SONET interface. See "Setting SONET

Receive Interface " page 21.

3 Set up the SONET structured payload. See "Setting Receive

Structured Payload/Test Signal " page 41.

4 Choose 2M PAYLOAD or DS1 PAYLOAD .

DROP 2 Mb/s

DROP DS1

5 Choose the LINE CODE.

Structured DSn

6 Set up, the required receive DSn interface, See "Setting DSn Receive

Interface " page 19.

7 Set upthe DSn TestSignal interface.See "Setting ReceiveStructured

Payload/Test Signal " page 41

8 Choose 2M PAYLOAD or DS1 PAYLOAD .

DROP 2 Mb/s

DROP DS1

9 Choose the LINE CODE.

Selecting Test Features

Adding Errors & Alarms at the SONET Interface

Description Errors and alarms can be added to the SONET interface signal during

testing.

HOW TO: 1 Set up the SONET transmit interface and payload required. See

"Setting SONET Transmit Interface " page 12.

2 Choose the ERROR ADD TYPE and RATE required.

Errors can be added at preset rates and at USER programmable rate. With theexceptionof ENTIRE FRAME and A1A2FRAME,errors can be added at ERROR ALL rate. If CV-L errors are chosen errors can be added to trigger an APS THRESHOLD.This takes the form ofN errors in T timeperiod. N and T are both selectable.

3 Choose the ALARM TYPE

Errors and Alarms can be added at the same time.

Selecting Test Features

Adding Errors & Alarms to the DSn Interface/DSn Payload

Adding Errors & Alarms to the DSn Interface/ DSn Payload

Description Errors and alarms can be added to the DSn interface/payload signal

during testing.

HOW TO: 1 If SONET interface is chosen, set up the SONET transmit interface

and payload required. See “Setting SONET Transmit Interface” page 12. If DSn interface is chosen, set up the DSn interface and payload required. See “Setting DSn Transmit Interface” page 10.

2 Choose the ERROR ADD TYPE and RATE on the Transmitter

TEST FUNCTION

The RATEcan be selected from aﬁxedvalue or is userprogrammable. If you select USER PROGRAM you can select the error rate before enabling the errors. This feature is useful for error threshold testing.

3 Choose the ALARM TYPE.

Errors and Alarms can be added at the same time.

display.

Selecting Test Features

Using FEAC Codes

Description The third C-Bit in subframe 1 is used as a FEAC channel, where alarm

or status information from the far-end terminal can be sent back to the near-end terminal. The channel is also used to initiate DS3 and DS1 line loopbacks at the far-end terminal from the near-end terminal.

The codes are six digits long and are embedded in a 16 bit code word; the format is 0XXXXXX011111111. There are two types of code, Loopback and Alarm Status. Loopback provides a choice of two DS1 messages and two DS3 Messages. The DS1 Messages can be sent in ALL DS1 channels or in a SINGLE channel. The message can be repeated up to 15 times. Alarm Status provides 13 preset codes and a USER programmable code function. These codes can be transmitted continuously or in bursts.

The new code is transmitted by choosing or .

HOW TO: Transmit an FEAC code

1 Choose SIGNAL and PAYLOADTYPE on the

MAIN SETTINGS

2 Choose and ALARM TYPE .

TRANSMIT

DS3 CBIT

display.

TEST FUNCTION DS3 FEAC

When a FEAC code is not being transmitted, an all ones pattern is transmitted.

BURST ON

TRANSMIT

Selecting Test Features

Using FEAC Codes

3 Choose the FEAC CODE TYPE. 4 Choose the MESSAGE from the choices displayed.

If you chose a DS1 message an additional ﬁeld to the right of the DS1 MESSAGE is displayed. Position the cursor on this ﬁeld and choose

or .

ALL

If youchoose use theEDIT keys toselecta channel from 1 to 28. Press when ﬁnished.

5 If is chosen, choose the REPEAT (TIMES) LOOP and

LOOPBACK

SINGLE CHANNEL

END EDIT

MESS, in the range 1 to 15.

6 If is chosen, choose the BURST LENGTH (TIMES).

ALARM/ STATUS

7 Choose TRANSMIT NEW CODE or to transmit the

selected FEAC message.

TIP: To View FEAC Messages

The received FEAC message can be viewed on the display.

BURST

RESULTS

Selecting Test Features

Setting DSn Spare Bits

Description Certain Spare Bits will cause the occurrence of a minor alarm when

received as a logical "0".: 8 Mb/s & 34 Mb/s - FAS Bit 12

2 Mb/s - NFAS Timeslot (timeslot 0 of NFAS frame) Bit 0

HOW TO: 1 If SONET interface is chosen, set up the SONET transmit interface

and payload required. See "Setting SONET Transmit Interface " page 12. If DSn interface is chosen, set up the DSn transmit interface and payload required. See "Setting DSn Transmit Interface " page 10.

2 Set the value of the spare bits required for testing.

If a BIT SEQUENCE is required, choose SEND SEQUENCE to transmit the sequence.

Selecting Test Features

Adding Pointer Adjustments

Description The transmitted SPE or VT pointer value can be adjusted for testing

purposes.

HOW TO: 1 Set up the SONET transmit interface and payload required. See

"Setting SONET Transmit Interface " page 12.

2 Choose the POINTER TYPE. 3 Choose the ADJUSTMENT TYPE required.

BURST - You determine the size of the burst by the number of PLACES chosen. If, for example, you choose 5 PLACES the pointer value will be stepped 5 times in unit steps e.g. 0 (start value), 1, 2, 3, 4, 5 (ﬁnal value). The interval between steps is as follows: For AU and TU-3, the minimum spacing between adjustments is 500 us. For VT the minimum spacing between adjustments is 2 ms. Choose ADJUST POINTER [ON] to add the chosen burst.

NEW POINTER- Youcanchoose apointer value inthe range 0to 782 with or without a New Data Flag. The current pointer value is displayed for information purposes. Choose ADJUST POINTER [ON] to transmit the new pointer value.

Selecting Test Features

Adding Pointer Adjustments

OFFSET - You can frequency offset the line rate or the SPE/VT rate, relative toeachother,thus producing pointer movements.If you offset the SPE pointer, an87:3sequenceofpointer movements is generated. The available conﬁgurations are listed in the following table. If you are currently adding Frequency Offset to the SONET interface or payload, pointer OFFSET is not available.

Pointer Type Line Rate SPE Rate VT Rate

SPE Constant Offset Tracks AU Payload SPE Offset Constant Constant VT Constant Constant Offset VT Offset Tracks Line Rate Constant

T1.105/GR-253 - Provides pointer movements according to T1.105 and GR-253:

4 Choose the T1.105/GR-253 ADJUSTMENT TYPE. 5 ChoosethePOLARITY,INTERVAL andPATTERN(where applicable)

for the selected sequence.

6 Choose POINTERSEQUENCES to generatetheselected

G.783 sequence and to stop the pointer sequences.

STOP INIT

START INIT

T1.105/GR-253 Pointer Sequences Explained

In addition to the BURST, NEW POINTER and OFFSET pointer movements described, the HP 37718A can also generate pointer sequences (pointer movements) according to T1.105.03 and GR-253.

Before running a pointer sequence you can elect to run an initialization sequence, followed by a cool down period, and then run the chosen sequence. This is selected using the START INIT softkey shown in the display on the previous page. Initialized pointer sequences are made up of three periods: the Initialization Period, the Cool Down Period, and the Sequence (Measurement) Period, an example is given in the following ﬁgure:

Selecting Test Features

Adding Pointer Adjustments

Non Periodic Sequence

Periodic Sequence

Initialization Sequence

Initialization

No Pointer Activity

Continuous Sequence

Cool Down

Sequence

Time

Measurement

Period

Note: SINGLE (A1), BURST (A2) and PHASE TRANSIENT(A3) are Non Periodic Sequences.

Initialization Period

ForSINGLEA1,BURSTA2and PHASE TRANSIENT A3 sequences the initialization sequence consists of 60 seconds of pointer adjustments applied at a rate of 2 adjustments per second and in the same direction as the speciﬁed pointer sequence.

Cool Down Period

A period following the initialization periodwhichforSINGLE e), BURST f) and PHASE TRANSIENT sequences is 30 seconds long when no pointer activity is present.

Sequence (Measurement) Period

The period following the Cool Down period where the speciﬁed pointer sequence runs continuously.

Periodic Test Sequences

For periodic test sequences (for example PERIODIC ADD) both the 60 second initialization and 30 second cool down periods consist of the same sequence as used for the subsequent measurement sequence. If the product of the period T and the selected Optional background pattern (87+3 or 26+1) exceeds 60 seconds then the longer period is used for the initialization. For example, if T is set for 10 seconds then the initialization period may be extended to 900 seconds.

The HP 37718A displays a message indicating which phase (initialization, cool down or measurement) the transmitter is currently generating.

Selecting Test Features

Adding Pointer Adjustments

NOTE The following conditions apply for pointer sequence generation:

The sequences can onlybeappliedto the SPE pointer when the SPE does not contain a VT structure, otherwise it is applied to the VT pointer. Pointer sequence generation is not available when a frequency offset is being applied to the Line Rate.

The following ﬁgure gives an example of a T1.105/GR-253, 87-3 Pointer Sequence.

T1.105 A4 and A5, 87-3 Pattern

No Pointer Adjustment

Pointer Adjustment

Start of Next 87-3 Pattern

Pointer Sequence

T1.105 A1 SINGLE GR-253 5-29

T1.105 A2 BURST OF 3 GR-253 5-30

An Example of a Pointer Sequence

Description

Periodic Single adjustments, all of the same polarity which is selectable. Separation between pointer adjustments is ﬁxed at approximately 30 seconds.

Periodic bursts of 3 adjustments, all of the same polarity which is selectable. The interval between bursts is ﬁxed at approximately 30 seconds. The interval between adjustments within a burst is set to the minimum.

Selecting Test Features

Adding Pointer Adjustments

Pointer Sequence

T1.105 A3 PHASE TRANSIENT GR-253 5031

T1.105 A4 PERIODIC NORMAL (87-3 Pattern) GR-253 5-33(b)

T1.105 A4 PERIODIC NORMAL (Continuous Pattern) GR-253 5-34(b)

GR-253 5-32(b) PERIODIC NORMAL (26-1 Pattern)

T1.105 A5 PERIODIC ADD (87-3 Pattern) GR-253 5-33(c)

Phase transient pointer adjustment burst test sequence. All adjustments are of the same polarity, which is selectable. The interval between bursts is ﬁxed at 30 seconds. Each burst consists of 7 pointer movement. The ﬁrst 3 in each burst are 0.25 s apart, and the interval between the 3 and 4 movement, and each remaining movement 0.5 seconds.

An 87-3 pattern is selected. The sequence pattern is 87 pointer movements followed by 3 missing pointer movements. Pointer polarity is selectable and the time interval between pointer adjustments settable.

Provides a continuous sequence of pointer adjustments. The polarity of the adjustments is selectable, and the time interval between adjustments can be set (see Note 1).

This selection is only available if you have selected VT1.5 mapping. The sequence pattern is 26 pointer movements followed by 1 missing pointer movement. Pointer polarity is selectable and the time interval between pointer adjustments programmable to 200 ms, 500 ms, 1 s, 2 s, 5 s or 10 seconds.

An 87-3 pattern is selected. The sequence pattern is 87 pointer movements followedby3missing pointer movements with anadded pointer movement after the 43rd pointer. The spacing between the added adjustment and the previous adjustment is set to the minimum. Pointerpolarity is selectable. Thetimeinterval between pointer adjustments can be set (see Note 1). Added adjustments occur every 30 seconds or every repeat of the 87-3 pattern, whichever is longer.

Description

T1.105 A5 PERIODIC ADD (Continuous Pattern) GR-253 5-34(c)

Periodic Single adjustments, with selectable polarity and added adjustment (1 extra). The spacing between the added adjustment and the previous adjustment is set to the minimum, (see Note 2). The time interval between pointer adjustments can be set (see Note

1). Added adjustments occur every 30 seconds or every repeat of the 87-3 pattern, whichever is longer.

Selecting Test Features

Adding Pointer Adjustments

Pointer Sequence

GR-253 5-32(c) PERIODIC ADD (26-1 Pattern)

T1.105 A5 PERIODIC CANCEL (87-3 pattern) GR-253 5-33(d)

T1.105 A5 PERIODIC CANCEL (Continuous Pattern) GR-253 5-34(d)

GR-253 5-32(d) PERIODIC CANCEL (26-1 pattern)

This selection is only available if you have selected VT1.5 mapping. The sequence pattern is 26 pointer movements followed by 1 missing pointer movement. Theaddedadjustmentoccurs 2 ms after the 13th pointer adjustment. Pointer polarity is selectable and the time interval between pointer adjustments programmable to 200 ms, 500 ms, 1 s, 2 s, 5 s or 10 s. Added adjustments occur every 30 seconds or every repeat of the 26-1 pattern, whichever is longer.

An 87-3 pattern is selected. The sequence pattern is 87 pointer movements followed by 3 missing pointer movements with a cancelled pointer movement at the 87th pointer. Pointer polarity is selectable, and the time interval between pointer adjustments can be set (see Note1).Cancelledadjustments occur every 30 seconds or every repeat of the 87-3 pattern, whichever is longer.

Periodic Single adjustments, with selectable polarity and cancelled adjustment (1 less). The time interval between pointer adjustments can be set (see Note 1). Cancelled adjustments occur every 30 seconds or every repeat of the 87-3 pattern, whichever is longer.

This selection is only available if you have selected VT1.5 mapping. The sequence pattern is 26 pointer movements followed by 1 missing pointer movement. The cancelled adjustment is the 26th pointer adjustment, that is the one before the regular gap of 1. Pointer polarity is selectable and the time interval between pointer adjustments programmable to 200 ms, 500 ms, 1 s, 2 s, 5 s or 10s. Cancelled adjustments occur every30secondsor every repeat of the 26-1 pattern, whichever is longer.

Description

NOTE For SPE pointers the sequence interval is selectable from 7.5 ms, 10, 20,

30, 34 ms; 40 to 100 ms in 10 ms steps, 100 to 1000 ms in 100 ms steps 1, 2, 5, 10 seconds. ForVTpointers the sequence interval is selectable from: 200 ms, 500 ms, 1, 2, 5 and 10 seconds. ForSPEpointerstheminimumspacingbetweenadjustmentsis500us. For VT pointers the minimum spacing between adjustments is 2 ms.

Selecting Test Features

Adding Pointer Adjustments

Table 1 Pointer Sequences Available with Selected Mapping

MAPPING

POINTER SEQUENCE

A1 SINGLE A2 BURST OF 3 A3 PHASE TRANSIENT A4 PERIODIC NORMAL(87-3) A4 PERIODIC NORMAL (Continuous) PERIODIC NORMAL (26-1) A5 PERIODIC ADD (87-3) A5 PERIODIC ADD (Continuous) PERIODIC ADD (26-1) A5 PERIODIC CANCEL (g) 87-3 A5 PERIODIC CANCEL (Continuous) PERIODIC CANCEL 26-1

SPE VT6, VT2 VT1.5

✓✓✓ ✓✓✓ ✓✓✓ ✓ ✓✓✓

✓ ✓ ✓✓✓

✓

Selecting Test Features

Using Pointer Graph Test Function

Pointer Graph shows the relative offset during the measurement period. This allows the time relationship of SPE or VT pointer movements to be observed. Up to4days of storage allows long termeffectssuchas Wander to be observed. If an alarm occursduringthemeasurementperiod, a new graph starts at the centre of the display (offset zero) after recovery from the alarm.

TIP: The Pointer Graph display can be logged to the chosen logging device.

See "Logging on Demand " page 100.

TIP: The graph can also beviewedonthe display

at the end of the measurement.

HOW TO: 1 Set up the receive SONET interface and payload as required. See

“Setting SONET Receive Interface” page 21.

2 Choose the CAPTURE INTERVAL required.

The capture interval determines the time between captures. Low values of capture interval should be chosen when a high degree of pointer movements is expected. High values ofcaptureinterval should be chosen when alowdegree of pointer movements is expected, for example Wander over 1 day, use 5 MINS and Wander over 4 days, use 20 MINS.

RESULTS

SONET RESULTS

Selecting Test Features

Using Pointer Graph Test Function

If, during a long term measurement (4 days), an event occurs at a particular time each day, a short term measurement can be made at the identiﬁed time to gain more detail of the event.

3 Choose the POINTER UNDER TEST type. 4 Press to start the measurement.

RUN/STOP

TIP: If the event occurs outside normal working hours, a Timed Start

measurement can be made. 1 SEC - display window of approximately 5 minutes. 5 SECS - display window of approximately 25 minutes. 20 SECS - display window of approximately 1 hour 40 minutes. 1 MIN - display window of approximately 5 hours. 5 MIN - display window of approximately 1 day. 20 MIN - display window of approximately 4 days.

Selecting Test Features

Stressing Optical Clock Recovery Circuits

Description Ideally clock recovery circuits in the network equipment optical

interfaces should recover the clock even in the presence of long strings of 0’s. You can check the performance of your optical clock recovery circuits using the STRESS TEST test function.

The stress test is available at all optical rates.

HOW TO: 1 Set up the SONET transmit interface and payload required. See

"Setting SONET Transmit Interface " page 12.

Choose the required STRESSING PATTERN. The G.958 test pattern consists of 7 consecutive blocks of data as follows: the ﬁrst row of section overhead bytes, ALL ONES, a PRBS, the ﬁrst row of section overhead bytes,ALL ZEROS, a PRBS and the ﬁrst row of section overhead bytes.

2 If you choose ALL ONES or ALL ZEROS as the stressing pattern,

choose the number of bytes in the BLOCK LENGTH.

Selecting Test Features

Generating Automatic Protection Switch Messages

Description You can program the K1 and K2 bytes to exercise the APS functions for

Both LINEAR (ITU-T G.783) and RING (ITU-T G.841) topologies.

HOW TO: 1 Set up the SONET transmit interface and payload required. See

"Setting SONET Transmit Interface " page 12.

2 Choose the ITU-T TOPOLOGY required. 3 Choose the message to be transmitted.

If LINEAR topology is chosen, choose the CHANNEL, the BRIDGED CHANNEL NO., the ARCHITECTURE and the RESERVED bits you require. If RING topology is chosen, choosetheDESTINATIONNODE ID, the SOURCE NODE ID, the type of PATH and the status code (K2 Bits 6>8) The currentTXand RX, K1 and K2,valuesare displayed for reference only.

4 Choose to transmit the new K1/K2 values.

DOWNLOAD

Selecting Test Features

Inserting & Dropping Data Communications Channel

Description The Data Communications Channel (DCC) of the regenerator and

multiplexer section overhead can be veriﬁed by protocol testing. The Insert and Drop capability provides access to the DCC via the RS-449 connector on the front panel of the Multirate Analyser module.

DCC INSERT is available on the , , display.

DCC DROP is available on the display.

HOW TO: 1 Connect the Protocol Analyzer to the DCC port on the Multirate

Analyzer module.

2 Choose the required DCC.

TRANSMIT

RECEIVE

SONET TEST FUNCTION

Selecting Test Features

Inserting & Dropping Data Communications Channel

3 Making Measurements

Making Measurements

Using Overhead BER Test Function

Description You can perform a Bit Error Rate test on chosen bytes of the section, line

and path overhead bytes. You can access the transmit Overhead BER on the

TEST FUNCTION

display.

TRANSMIT

SONET

HOW TO: 1 Set up the SONET transmit interface and payload required. See

"Setting SONET Transmit Interface " page 12.

2 Set up the receive SONET interface and payload as required. See

"Setting SONET Receive Interface " page 21.

3 Choose the overhead byte to be tested on the

TEST FUNCTION

display.

RECEIVE

SONET

4 Choose the overhead byte to be tested on the

TEST FUNCTION

5 Press to start the test.

RUN/STOP

display.

6 The PRBS pattern can be errored by pressing .

TRANSMIT

SINGLE

SONET

Making Measurements

Test Timing

Description There are two aspects to test timing:

• Error results may be displayed as short term or cumulative over the measurement period.If short term error measurements are required, the short term period may be selected.

• The period of the test may be deﬁned or controlled manually.

HOW TO: 1 Choose on the display.

TIMING CONTROL

RESULTS

2 Choose the SHORT TERM PERIOD to the timing required for short

term results.

3 Choose the type of TEST TIMING required:

For manual control with choose .

RUN/STOP

MANUAL

For a single timed measurement period started with , choose and choose the Test duration.

SINGLE

Fora timed period starting at a speciﬁed time, choose , choose the Test duration and the test START date and time.

RUN/STOP

TIMED

Making Measurements

Making SONET Analysis Measurements

MakingSONETAnalysisMeasurements

Description G.826 analysis results are provided for all relevant SONET error

sources. In addition the following results are provided:

Cumulative error count and error ratio Short Term error count and error ratio Alarm Seconds Frequency Pointer Values Pointer Graph

HOW TO: 1 Set up the receive SONET interface and payload required. See

"Setting SONET Receive Interface " page 21.

2 If required set up the SONET transmit interface and payload. See

"Setting SONET Transmit Interface " page 12.

3 Press to start the measurement. 4 You can view the analysis results on the

TIP: The measurement will not be affected if you switchbetweenthedifferent

results provided.

RUN/STOP

ANALYSIS

display.

RESULTS

SONET

Making Measurements

Making DSn Analysis Measurements

Description G.821, G.826, M.2100, M.2110 and M.2120 analysis results are provided

for all relevant DSn and DSn Payload error sources. In addition the following results are provided:

Cumulative error count and error ratio Short Term error count and error ratio Alarm Seconds SIG/BIT Monitor. See "Monitoring Signaling Bits " page 78.

HOW TO: 1 If SONET is chosen as the interface, set up the Receive Interface and

Payloadrequired. See "Setting SONETReceive Interface" page 21. If required set up the Transmit Interface and Payload. See "Setting SONET Transmit Interface " page 12.

2 If DSn ischosenas the interface, set up the DSnreceiveinterface. See

"Setting DSn Receive Interface " page 19. If required set up the DSn

transmit interface. See "Setting DSn Transmit Interface " page 10.

3 Press to start the measurement.

RUN/STOP

4 If SONET is chosenasthe interface, you can view the analysis results

on the display

RESULTS

DSn PAYLOAD

ERROR ANALYSIS

If DSn is chosen as the interface, you can view the analysis results on the display.

RESULTS

DSn ERROR ANALYSIS

Making Measurements

Measuring Frequency

Description The signal frequencyandthe amount of offset from thestandardrate can

be measured to give an indication of probability of errors.

HOW TO: 1 Connect the signal to be measured to the IN port of the DSN Receive

module or the IN port of the Multirate Analyzer module (SONET electrical) or the IN port of the Optical Interface module (SONET optical).

NOTE Frequency measurement is always available even if test timing is off.

Making Measurements

Measuring Optical Power

Description Optical power measurement can be performed on the SONET signal

connected to the Optical module IN port.

HOW TO: 1 Connect the SONET optical signal to the IN port of the Optical

Interface module.

2 Choose the received input signal rate on the

display.

NOTE Optical power measurement is always available even if test timing is off.

RECEIVE

SONET

Making Measurements

Measuring Round Trip Delay

Description: The time taken for voice trafﬁc to pass through the network is very

important. Excessive delay can make speech difﬁcult to understand. The Round Trip Delay feature of the HP 37718A measures the delay in a 64 kb/s timeslot. A test pattern is transmitted in the 64 kb/s timeslot and a timer is set running. A loopback is applied to the network equipment to return the test signal. The received pattern stops the timer and the Round Trip Delay is calculated.

NOTE You can only measure Round Trip Delay on a 64 kb/s test signal obtained

from a 34 Mb/s or 2 Mb/s DSn interface or DSn payload signal.

HOW TO: 1 If measuringonan SONET interface, set uptheSONET transmit and

receive interfaces and payloads required. See "Setting SONET Transmit Interface" page 12 and “SettingSONET Receive Interface” page 21.

2 If measuring on a DSn interface, set up the DSn transmit and receive

interfaces and payloads required. See “Setting DSn Transmit Interface” page 10 and “Setting DSn Receive Interface” page 19.

3 Connect a loopback to the network equipment.

Making Measurements

Measuring Round Trip Delay

4 Choose ACTION to start the measurement.

If measuring on an SONET interface, the results are available on the

RESULTS

DSn PAYLOAD

display.

If measuring on a DSn interface, the results are available on the

display.

RESULTS

DSn

The Round Trip delay measurement range is up to 2 seconds. The resolution varies with the received interface signal rate:

2 Mb/s 1 microsecond 34 Mb/s 110 microseconds STS-1,STS-3 0.5 milliseconds

OC-12, OC-48 0.5 milliseconds

Making Measurements

Monitoring Signaling Bits

Description The HP 37718A receiver can be used to monitor the state of signaling

bits in received 2 Mb/s signals with timeslot-16 CAS multiframing (PCM30 or PCM30CRC) and DS1 structured signals.

2.048 Mb/s Results

DS1 Results D4 and SLC-96 payloads

For 2 Mb/s signals with timeslot-16 CAS multiframing a table showing the values of A,B,C,D signaling bits in all 30 channels is given.

A table simultaneously showing the state of the A and B signaling bits in the 6th and 12th frames of a superframe is given. Each frame contains 24 timeslots. In SLC-96 mode A and B choices are 0, 1 or alternating. If you set bit A or B to alternate, the displayed bit changes to an A, to indicate that the bit is alternating from 1 to 0. The same signaling is transmitted in all channels.

ESF Payloads

A table simultaneously showing the state of the A, B, C and D signaling bits in the 6th, 12th, 18th and 24th frames of a superframe is given. Each frame contains 24 timeslots.

Making Measurements

Measuring Service Disruption Time

Description: Protection switching ensures that data integrity is maintained and

revenue protectedwhenequipment failure occurs. The speedofoperation of the protection switch can be measured.

The sequence of events involved in measuring the switching time is:

• Pattern Synchronization (no errors) is achieved.

• The protection switch is invoked - Pattern Synchronization is lost.

• The standby line is in place - Pattern Synchronization is regained.

The time interval between pattern sync loss and pattern sync gain is a measure of the disruption of service due to protection switching.

Service Disruption is chosen on the page except for the following conﬁguration:

• If you choose a DSn or SONET interface and an ANSI (DS1, DS3) framed, unstructured payload you must select Service Disruption on the Transmitter and Receiver display.

RESULTS

TEST FUNCTION

Making Measurements

Measuring Service Disruption Time

NOTE At DS1 and DS3 Service Disruption results are only available for

Unstructured payloads.

Error Burst Deﬁnition

Error bursts start and ﬁnish with an error. Bursts of less than 10 us are ignored. Bursts are assumed to have completed when >2000ms elapses without any errors being received. The longest burst detected is 2 seconds.

Accuracy

300 us for DS1, 2Mb/s and 34Mb/s signals. 60 us for DS3 signals.

HOW TO: 1 If interfacing at SONET set up the SONET transmit and receive

interfaces and payloads required. See "Setting SONET Transmit Interface " page 12 and "Setting SONET Receive Interface " page 21.

2 If interfacing at DSn set up the DSn transmit and receive interfaces

and payloads as required. See "Setting DSn Transmit Interface " page 10 and "Setting DSn Receive Interface " page 19.

3 If you choose a DS1 or DS3 framed unstructured payload, choose

SERVICE DISRUPT

on the and

TRANSMIT

RECEIVE

TEST FUNCTION

displays.

Making Measurements

Measuring Service Disruption Time

4 Press to start the measurement.

RUN/STOP

5 Invoke the protection switch. 6 View the results on the display.

RESULTS

SRVC DISRUPT

Results Displayed LONGEST - Longest burst of errors during measurement.

SHORTEST - Shortest burst of errors during measurement. LAST - Length of last burst of errors detected during measurement.

Making Measurements

Performing a SONET Tributary Scan

Description Tributary Scan tests each tributary for error free operation and no

occurrence of Pattern Loss. A failure is indicated by highlighting the tributary in which the failure occurred. The

MAIN SETTINGS

, mapping setup determines the tributary structure.

TRANSMIT

The HP 37718A will conﬁgure the Transmitter to the Receiver and the PATTERN is forced to the payload it will ﬁll.

TIP: The SONET Tributary Scan display can be logged to the chosen logging

device. See "Logging on Demand " page 100.

SONET

HOW TO: 1 Set up the transmit and receive SONET interfaces and payload as

required. See "Setting SONET Transmit Interface " page 12 and

"Setting SONET Receive Interface " page 21.

2 Choose the required BIT ERROR THRESHOLD.

This determines the error rate above which a failure is declared.

3 Choose the required TEST TIMING.

The valueyouchoose is the testtimefor each individual tributary and not the total test time. For example, 28 VT-1.5 tributaries in an STS-1 SPE - the time taken to complete the Tributary Scan will be 28 X TEST TIMING choice.

Making Measurements

Performing a SONET Tributary Scan

4 The Tributary Scan results can be viewed on the

SONET TRIBSCAN

The Scancanbe started on the display or the display by choosing START. If the Scan is started on the display, the HP 37718A changes to the display.

display.

RESULTS

TRANSMIT

SONET TEST FUNCTION

RESULTS

If a single path, for example, MAPPING is chosen, then Tributary Scan is disabled.

NOTE The keyboard is locked during tributary scan.

RESULTS

SONET TEST FUNCTION

STS-3c SPE

Making Measurements

Performing an SONET Alarm Scan

Description SONET Alarm Scan tests each channel for alarm free operation and

identiﬁes and indicates any Unequipped channels. You can conﬁgure the Scan to check for the occurrence of any Path layer CV errors above a chosen threshold. The channel in which an alarm occurred is highlighted if any of the following alarms occur:

STS SPE: LOP-P, RDI-P, AIS-P, VT-1.5: LOP-P, AIS-P, RDI-P, H4 LOM, LOP-V, AIS-V, RDI-V

TIP: The SONET Alarm Scan display can be logged to the chosen logging

device. See "Logging on Demand " page 100.

HOW TO: 1 Set up the receive SONET interface and payload as required. See

“Setting SONET Receive Interface” page 21.

2 Choose on the display.

SONET ALM SCAN

RESULTS

3 Choose AUTO or RX SETTINGS.

RX SETTINGS: The scan checks the structure set on the

SONET

display.

RECEIVE

AUTO: The scan checks the structure being received. This can be particularly useful when receiving mixed payloads.

4 Choose the CV error threshold. 5 Choose to start the Alarm Scan.

START

Making Measurements

Performing a DSn Alarm Scan

Description DSn Alarm Scan tests each channel for the following alarms:

Frame Loss RAI AIS

The channel in which an alarm occurs is highlighted.

HOW TO: 1 Setupthe receiveDSn interfaceasrequired. See“Setting DSnReceive

Interface” page 19.

2 Choose to start the Alarm Scan.

Making Measurements

Performing a DSn Alarm Scan

4 Storing, Logging and Printing

Storing, Logging and Printing

Saving Graphics Results to Instrument Store

Description Graphical representation of measurement results is very useful

particularly during a long measurement period. It provides an overview of the results and can be printed for record keeping.

Graphics results can be stored in instrument graph storage or on ﬂoppy disk.

HOW TO: 1 Before starting your measurement, choose the GRAPH STORAGE

resolution and location. The resolution chosen affects the ZOOM capability when viewing the bar graphs. If 1 MIN is selected, 1 MIN/BAR, 15 MINS/BAR and 60 MINS/BAR are available. If 15 MINS is selected, 15 MINS/BAR and 60 MINS/BAR are available. If 1 HOUR is selected, 60 MINS/BAR is available. The graphics results can be stored in the instrument - INTERNAL or stored on DISK. Storage to disk will use a default ﬁle name unless a ﬁle name is speciﬁed on the display. See “Saving Graphics Results to Disk” page 126.

2 Press to start the measurement. Graphical results will be

stored in the chosen location.

RUN/STOP

OTHER

FLOPPY DISK

Storing, Logging and Printing

Recalling Stored Graph Results

Description Results stored from a previous measurement can be recalled to the

graphics displays for viewing and printing.

HOW TO: 1 If currently viewingthebar graph display, select then

STORE STATUS

select .

STORE STATUS

. If currently viewing the error or alarm summary,

TEXT RESULTS

2 Using and , move the highlighted cursor to the store location

which contains the required results. If therequiredresults are stored onDisk,move the highlighted cursor to DISK and choose RECALL GRAPHICS on the FLOPPY DISK display. See “Recalling Graphics Results from Disk” page 131.

3 Choose if you wish to view the bar graphs.

GRAPH RESULTS

The display will change to the bar graph display of the highlighted results.

4 Choose if you wish to view the error and alarm

TEXT RESULTS

Summaries. The display will change to the text results display of the highlighted results.

DELETE STORE

If is chosen, a ;

DELETE ALL

deletes the results in the highlighted store.

CONFIRM DELETE ABORT DELETE

choice prevents accidental deletion of all the stored results.

Storing, Logging and Printing

Recalling Stored Graph Results

The top row of the display comprises ﬁve ﬁelds: Store Memory location in whichthedisplayedbar graph data

is stored. Move the highlighted cursor, to the STORE location desired, using and .

Start Date The start date of the test, which produced the stored

results.

Start Time The start time of the test, which produced the stored

results.

Test Duration The duration of the test, which produced the stored

results.

Store Use The percentage (%) of the overall storage capacity

occupied by each set of stored results. The TOTAL percentage used and the percentage still FREE is provided at the bottom of the STORE USE column.

Storing, Logging and Printing

Viewing the Bar Graph Display

Description All the graphic results obtained during the measurement are available

for viewing. Identify a period of interest and zoom in for more detailed examination.

HOW TO: 1 To view the current bar graphs, press and use

CHANGE UPPER

and to obtain the bar graphs

CHANGE LOWER

GRAPH

required.

2 To view previously stored graphs, see "Recalling Stored Graph

Results " page 89.

3 For more detailed inspection of the bar graph, position the cursor

centrally within the area of interest using , and select

ZOOM IN

to reduce the time axis to 15 MINS/BAR. This is only possible if the graphics results were stored with a STORAGE resolution of 1 SEC,1 MINS or 15 MINS. For further reduction of the time axis to 01 MINS/BAR or 01 SECS/ BAR, position the cursor centrally within the area of interest and select until the required time axis is obtained.

ZOOM IN

The top row of the display comprises three ﬁelds:

Store Memory location in whichthedisplayedbar graph data

is stored. Store can only be changed when the status of stored results is displayed. See "Recalling Stored Graph Results " page 89.

Storing, Logging and Printing

Viewing the Bar Graph Display

Zoom The width, in minutes, of each "bar" in the bar graph,

controlled by / .

ZOOM IN ZOOM OUT

Cursor The cursor position in terms of time and date,

controlled by and . The cursor position changes in steps of 1 second, 1 minute, 15 minutes or 60 minutes dependentupontheZOOM setting. The cursor is physically located between the two graphs.

Storing, Logging and Printing

Viewing the Graphics Error and Alarm Summaries

Description The error and alarm summaries of the measurement chosen are

displayed on the display. The error summary or alarm summary can be viewed at any time.

TEXT RESULTS

HOW TO: 1 To view the error or alarm summary associated with the current bar

graphs, press then .

2 Toview the errororalarm summary associatedwithpreviously stored

bar graphs, see "Recalling Stored Graph Results " page 89.

3 To view the Alarms which have occurred during the measurement,

select .Use toviewthe DSn/DSn; and SONET Alarm Summaries in turn if applicable.

4 To view the Errors which have occurred during the measurement

select .Use toviewthe DSn/DSn; and SONET Error Summaries in turn if applicable. The top row of the display comprises three ﬁelds:

Store Memory location in which the bar graphs, error

ALARM SUMMARY NEXT SUMMARY

ERROR SUMMARY NEXT SUMMARY

GRAPH

summary and alarm summary are stored. Store can only be changed when the status of stored results is displayed. See "Recalling Stored Graph Results " page 89.

TEXT RESULTS

Storing, Logging and Printing

Viewing the Graphics Error and Alarm Summaries

Start The start time and date of the test, that produced the

displayed results.

Stop The stop time and date of the test, that produced the

displayed results.

Storing, Logging and Printing

Logging Graph Displays

Description The bar graphs and error and alarm summariescanbeloggedtothe disk

for printing at a later date. If Option 601, Remote Control, is ﬁtted, the bar graphs and error and alarm summary can be logged to an external HP DeskJet printer at the end of the test period. If a printer is not immediately available, the graphics results remain in memory and can be logged at a later time when a printer becomes available.

HOW TO: Log to an External Printer

1 Connect an external RS-232-C HP DeskJet printer to the HP 37718A

RS232 port. See "Logging Results to RS-232-C Printer " page 105 or connect an external HP-IB HP DeskJet printer to the HP 37718A HPIB port. See "Logging Results to HP-IB Printer " page 103 or connect a Parallel DeskJet printer to the HP 37718A Parallel port. See

"Logging Results to Parallel (Centronics) Printer " page 102.

2 Make the required selections on the display:

LOGGING PORT [HPIB] or [RS232] or [PARALLEL] and LOGGING [ON].

3 TologtheErrorandAlarmsummaries, the displayed Bar graphs and

the Alarm graph to the printer, choose on the bar graph display.

OTHER

LOGGING

Storing, Logging and Printing

Logging Graph Displays

4 Choose to conﬁrm or abort the print.

Toconﬁrmthe print and only print the portion of the graph displayed and the summaries choose . To conﬁrm the print and print the graph for the whole measurement period and the summaries choose . To abort the print choose .

5 To log the selected Error and Alarm summaries to the printer, choose

on the Text Results display.

HOW TO: Log to the Disk Drive

1 Insert a ﬂoppy disk in the disk drive.

THIS SCREEN

CURSOR TO END

ABORT

2 Choose LOGGING PORT on the display.

Enter a ﬁlename on the display. See "Saving

DISK

OTHER

FLOPPY DISK

LOGGING

Data Logging to Disk " page 128.

3 TologtheErrorandAlarmsummaries, the displayed Bar graphs and

the Alarm graph to the disk, choose on the bar graph display.

4 Choose to conﬁrm or abort the print.

Toconﬁrmthe print and only print the portion of the graph displayed and the summaries choose .

THIS SCREEN

To conﬁrm the print and print the graph for the whole measurement period and the summaries choose . To abort the print choose .

ABORT

CURSOR TO END

5 To log the selected Error and Alarm summaries to the disk, choose

on the Text Results display.

Storing, Logging and Printing

Logging Results

Description Test Period Logging

If degradations in system performance can be observed at an early stage, then the appropriate remedial action can be taken to maximize circuit availability and avoid system crashes. Test period logging allows you to monitor the error performance of your circuit. At the end of the test period the selected results are logged. Results can be logged at regular intervals during the test period by selecting a LOGGING PERIOD of shorter duration than the test period. An instant summary of the results can be demanded by pressing without affecting the test in progress.

Error Event Logging

Manual tracing of intermittent faults is time consuming. Error event logging allows you to carry out unattended long term monitoring of the circuit. Each occurrence of the selected error event is logged.

PRINT NOW

The results obtained during the test are retained in memory until they are overwritten by the next set of results. The results can be logged at any time during the test period and at the end of the test period. The results required are selected using LOGGING SETUP .

CONTROL

OTHER

LOGGING

Any Alarm occurrence results in a timed and dated message being logged.

BER and Analysis results can be selected by the user. Cumulative and Period versions of the results are calculated and can be

selected by the user. Period The results obtained over a set period of time during

the test. The Period is deﬁned by the LOGGING PERIOD selection.

Cumulative The results obtained over the time elapsed since the

start of the test.

The results can be logged to the following devices, selectable using

OTHER

LOGGING DEVICE

LOGGING SETUP :

Storing, Logging and Printing

Logging Results

• Optional Internal printer ﬁtted into the instrument front cover

(Option 602)

• External HP-IB printer (option 601)

• External RS-232-C printer (option 601)

• External Parallel Port printer (option 601)

• Disk Drive

HOW TO: 1 Choose LOGGING [ON] - enables the logging of results and alarms.

2 Choose LOGGING PERIOD - determines how regularly the results

and alarms are logged. USER PROGRAM provides a choice of 10 minutes to 99 hours.

3 Choose RESULT LOGGED - allows you to log all results to or choose

only those results you require.

4 Choose WHEN - allows you to choose to only log when the error count

for the logging period isgreaterthan0. If the error count is 0 then the message NO BIT ERRORS is displayed.

5 Choose CONTENT - allows you a choice of error results to be logged.

Error Results, Analysis or Error and Analysis (ER & ANAL) and Period, Cumulative or Period and Cumulative (PER & CUMUL).

6 If LOG ERRORSECONDS[ON] is chosen a timedanddated message

is logged each time an error second occurs (excessive occurrences of error seconds during the logging period will result in heavy use of

Storing, Logging and Printing

Logging Results

printer paper).

7 Choose the logging DEVICE.

If RS232 is chosen, see "Logging Results to RS-232-C Printer " page 105. If HPIB is chosen, see "Logging Results to HP-IB Printer " page 103. If PARALLEL ischosen,see "LoggingResultsto Parallel(Centronics) Printer " page 102. If DISK is chosen, see “Saving Data Logging to Disk” page 128. If Option602,Internal Printer, is ﬁttedandINTERNAL is chosen, see

"Logging Results to Internal Printer " page 104.

Storing, Logging and Printing

Logging on Demand

Description When is pressed the chosen results are logged to the chosen

logging device. The choice of results for logging is:

PRINT NOW

RESULTS SNAPSHOT - last recorded measurement results OVERHEAD SNAPSHOT - last recorded overhead values of the chosen STS-3 OVERHEAD CAPTURE - Overhead Capture display SCREEN DUMP - allows logging of the chosen display POINTER GRAPH - Pointer Graph display SONET TRIBUTARY SCAN - SONET Tributary Scan display SONET ALARM SCAN - SONET Alarm Scan display SELTEST FAILS - Last recorded selftest failures

HOW TO:

1 Choose LOG ON DEMAND to determine results to be logged when

PRINT NOW

SCREEN DUMP allows you to log the selected display when

PRINT NOW

using this feature).

2 Choose the logging DEVICE.

If RS232 is chosen, see "Logging Results to RS-232-C Printer " page 105. If HPIB is chosen, see "Logging Results to HP-IB Printer " page 103.

100

is pressed. is pressed. (Logging or Disk displays cannot be logged

Agilent 37718A Users Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Setting the Interfaces

Setting DSn Transmit Interface

Setting SONET Transmit Interface

Setting SONET THRU Mode

Using Smart Test

Setting DSn Receive Interface

Setting SONET Receive Interface

2 Selecting Test Features

Using Transmit Overhead Setup

Using Receive Overhead Monitor

Setting Overhead Trace Messages

Generating Overhead Sequences

Using Receive Overhead Capture

Adding Frequency Offset to SONET Signal

HOW TO: SONET Line Rate Offset

Tributary Offset ±100 ppm

Adding Frequency Offset to the DSn Signal

Setting up Signaling Bits

DSn Operation

SONET Operation

Setting Transmit Structured Payload/Test Signal

Signaling

Setting Receive Structured Payload/Test Signal

Setting TransmitNx64kb/s/N x 56 kb/s Structured Payload/Test Signal

Signaling

Setting Receive N x 64 kb/s/N x 56 kb/s Structured Payload/Test Signal

Inserting an External DSn Payload/Test Signal

HOW TO: Insert 34 Mb/s & DS3

Insert 2 Mb/s or DS1 (Unstructured SONET Payload)

Insert 2 Mb/s or DS1 (Structured SONET Payload or Structured DSn)

Structured SONET Payload

Dropping an External Payload/Test Signal

HOW TO: Drop 34 Mb/s & DS3

Drop 2 Mb/s /DS1 (Unstructured SONET Payload)

Drop 2 Mb/s/DS1 (Structured SONET Payload or Structured DSn

Structured SONET Payload

Structured DSn

Adding Errors & Alarms at the SONET Interface

Adding Errors & Alarms to the DSn Interface/DSn Payload

Using FEAC Codes

HOW TO: Transmit an FEAC code

TIP: To View FEAC Messages

Setting DSn Spare Bits

Adding Pointer Adjustments

T1.105/GR-253 Pointer Sequences Explained

Initialization Period

Cool Down Period

Sequence (Measurement) Period

Periodic Test Sequences

Using Pointer Graph Test Function

Stressing Optical Clock Recovery Circuits

Generating Automatic Protection Switch Messages

Inserting & Dropping Data Communications Channel

3 Making Measurements

Using Overhead BER Test Function

Test Timing

Making SONET Analysis Measurements

Making DSn Analysis Measurements

Measuring Frequency

Measuring Optical Power

Measuring Round Trip Delay

Monitoring Signaling Bits

DS1 Results D4 and SLC-96 payloads

ESF Payloads

Measuring Service Disruption Time

Performing a SONET Tributary Scan

Performing an SONET Alarm Scan

Performing a DSn Alarm Scan

4 Storing, Logging and Printing

Saving Graphics Results to Instrument Store

Recalling Stored Graph Results

Viewing the Bar Graph Display

Viewing the Graphics Error and Alarm Summaries

Logging Graph Displays

HOW TO: Log to an External Printer

Logging Results