HP 37717C
Communications
Performance Analyzer
User’s Guide
PDH/SDH
Operation
Copyright HewlettPackard Ltd.1998
All rights reserved.
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HP Part No.
37717-90402
First edition, 03/98
Printed in U.K.
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!
The product is marked
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against damage.
The product is marked
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Hewlett-Packard Limited
Telecommunications Networks Test Division
South Queensferry
West Lothian, Scotland EH30 9TG
User’s Guide PDH/SDH Operation
HP 37717C 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
• Test features, for example, the addition of errors and alarms to the test 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.
NOTE If your instrument includes option 120 an additional User’s
Guide for Sonet operation is provided (part number 37717-
90403). The contents are similar to this manual but with
Sonet terminology used in place of SDH terminology.
iv
Contents
1 Setting the Interfaces
Setting PDH Transmit Interface 2
Setting PDH Transmit Binary Interface 4
Setting SDH Transmit Interface 6
Setting Jitter Transmit Interface 9
Setting Wander Transmit Interface 11
Selecting the Physical Transmit Interface for ATM Payloads 13
Setting SDH THRU Mode 15
Using Autosetup 17
Setting PDH Receive Interface 19
Setting PDH Receive Binary Interface 21
Setting SDH Receive Interface 22
Setting Jitter Receive Interface 24
Selecting the Physical Receive Interface for ATM payloads 26
2 Selecting Test Features
Using Transmit Overhead Setup 28
Using Receive Overhead Monitor 30
Setting Overhead Trace Messages 32
Generating Overhead Sequences 33
Using Receive Overhead Capture 35
Adding Frequency Offset to SDH Signal 37
Adding Frequency Offset to the PDH Signal 39
Setting up Signaling Bits 40
Setting Transmit Structured Payload/Test Signal (Options UKJ or
110) 43
Setting Receive Structured Payload/Test Signal 45
Connecting A Telephone Handset 47
v
Contents
Setting Transmit N x 64 kb/s
(N x 56 kb/s) Structured Payload/Test Signal 48
Setting Receive N x 64 kb/s (N x 56 kb/s) Structured Payload/Test
Signal 50
Inserting an External PDH Payload/Test Signal 52
Dropping an External Payload/Test Signal 55
Selecting ATM Cell Stream Payload 57
Selecting ATM Cell Stream Timing Distribution 58
Selecting ATM Cell Stream Headers and Interface 59
Adding Errors & Alarms at the SDH Interface 60
Adding Errors & Alarms to the PDH Interface/PDH Payload 61
Using FEAC Codes in the HP 37717C 63
Adding ATM Errors and Alarms 66
Setting PDH Spare Bits 67
Adding Pointer Adjustments 68
G.783 Pointer Sequences Explained 70
Using Pointer Graph Test Function 76
Stressing Optical Clock Recovery Circuits 78
Generating Automatic Protection Switch Messages 79
Inserting & Dropping Data Communications Channel 80
3 Making Measurements
Using Overhead BER Test Function 82
Test Timing 83
Making SDH Analysis Measurements 84
Making PDH Analysis Measurements 85
Measuring Jitter 87
Measuring Wander 89
Measuring Frequency 91
vi
Contents
Measuring Optical Power 92
Measuring Round Trip Delay 93
Monitoring Signaling Bits 95
Measuring Service Disruption Time 97
Performing an SDH Tributary Scan 99
Performing an SDH Alarm Scan 101
Performing a PDH/DSn Alarm Scan 102
Measuring Jitter Tolerance 103
Measuring Jitter Transfer 106
Selecting the ATM Measurement Parameters 111
Making ATM Measurements 113
Measuring Cell Transfer Delay and Cell Delay Variation 114
Measuring ATM Non-Conforming cells and one-point Cell Delay
Variation. 116
Monitoring ATM Alarms 117
4 Storing, Logging and Printing
Saving Graphics Results to Instrument Store 120
Recalling Stored Graph Results 121
Viewing the Bar Graph Display 123
Viewing the Graphics Error and Alarm Summaries 125
Logging Graph Displays 127
Logging Results 128
Logging Results to Parallel (Centronics) Printer 131
Logging Results to HP-IB Printer 132
Logging Results to Internal Printer 133
Logging Results to RS-232-C Printer 134
Printing Results from Disk 135
Connecting an HP DeskJet Printer to a Parallel Port 136
vii
Contents
Logging Jitter Tolerance Results 137
Logging Jitter Transfer Results 139
Changing Internal Printer Paper 141
Cleaning Internal Printer Print Head 144
5 Using Instrument and Disk Storage
Storing Configurations in Instrument Store 146
Storing Current Configurations on Disk 147
Setting up a Title for Configurations in Instrument Store 148
Recalling Configurations from Instrument Store 149
Formatting a Disk 150
Labeling a Disk 151
Managing Files and Directories on Disk 152
Adding Descriptors to Disk Files 156
Saving Graphics Results to Disk 157
Saving Data Logging to Disk 159
Recalling Configuration from Disk 160
Recalling Graphics Results from Disk 161
Copying Configuration from Instrument Store to Disk 162
Copying Configuration from Disk to Instrument Store 163
Copying Graphics Results from Instrument Store to Disk 164
Deleting a File on Disk 166
Deleting a Directory on Disk 167
Renaming a File on Disk 168
Creating a Directory on Disk 169
viii
Contents
6 Selecting and Using "Other" Features
Coupling Transmit and Receive Settings 172
Suspending Test on Signal Loss 173
Setting Time & Date 174
Enabling Keyboard Lock 175
Enabling Beep on Received Error 176
Enabling Analysis Control 177
Setting Error Threshold Indication 178
Dumping Display to Disk 179
Setting Screen Brightness and Color 181
Running Self Test 182
7 AU-3/TUG-3 Background Patterns
8 ETSI/ANSI Terminology
ETSI/ANSI Conversion and Equivalent Terms 192
Index
ix
Contents
x
1
1 Setting the Interfaces
This chapter tells you how to set the
instrument interfaces to match the network
being tested.
Setting the Interfaces
Setting PDH Transmit Interface
Description PDH 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
Option
Differences
If Option 110 is fitted the following SIGNAL rates and TERMINATION
choices apply:
2 Mb/s - Termination 75 Ω UNBAL or 120Ω BAL
34 Mb/s - fixed 75Ω UNBAL
DS1 - 100 Ω BAL; select LINE CODE from AMI or B8ZS, and OUTPUT
LEVEL from DSX-1 or DS1-LO.
DS3 - 75Ω UNBAL; LINE CODE fixed B3ZS; select OUTPUT LEVEL
from DS3-HI, DSX-3 or DS3-900’.
2
Setting the Interfaces
Setting PDH Transmit Interface
HOW TO: 1 Choose the required PDH SIGNAL rate.
If Option 110 is fitted, rates of 34Mb/s, 2Mb/s, DS1 and DS3 are
available. If Option UKJ is fitted rates of 2, 8, 34 and 140 Mb/s are
available.
2 If Option UH3, Binary Interfaces is fitted, choose the INTERFACE
required. See "Setting PDH Transmit Binary Interface " page 4.
3 Choose the required clock synchronization source (CLOCK SYNC).
If Option UH3, Binary Interfaces is fitted, the clock can be derived
from an external binary input.
If Option A3K, Jitter and Wander Generator, is fitted and 2 Mb/s
Signal rate is chosen the clock can be derived from an external 2 Mb/s
signal connected to the 2M REF IN port of the Jitter Generator
module.
4 If you have chosen 2 Mb/s as the PDH signal rate, choose the required
impedance (TERMINATION). At all other rates the impedance is
fixed. See Option Differences on previous page.
5 If you have chosen 2 Mb/s, DS1 or 8 Mb/s as the PDH signal rate,
choose the required coding (Line Code). At 34 Mb/s and 140 Mb/s
coding is fixed.
See Option Differences.
6 If required choose the FREQUENCY OFFSET value.
See “Adding Frequency Offset to SDH Signal” page 37
7 Choose the required Payload Type.
If Structured is chosen the PDH test signal must be set up. See
“Setting Transmit Structured Payload/Test Signal (Options UKJ or
110)” page 43.
If you have chosen 2 Mb/s as the PDH signal rate, the Framed choice
is expanded to provide a menu of 2 Mb/s framing types.
8 Choose the PATTERN type and PRBS POLARITY.
3
Setting the Interfaces
Setting PDH Transmit Binary Interface
Setting PDH Transmit Binary Interface
Description Option UH3, Binary Interfaces, provides binary NRZ interface for PDH
measurements. The interfaces can operate at any of the standard rates
±100 ppm.
PDH transmit binary interface settings should match the network
equipment thresholds and polarity requirements for the binary
interfaces
Variable Rate Binary Interface
If your instrument also includes option UKK, variable rate binary
interface is available. This allows you to select fixed rates that are
different from standard telecom rates, and also to vary frequency over a
wide range. Applications include component test, testing satellite and
cable networks and testing PDH digital radios. A Product Note is
available (part number 5965-4885E) which explains the use of a variable
rate binary interface in the testing of PDH digital radios.
.
4
Setting the Interfaces
Setting PDH Transmit Binary Interface
HOW TO: 1 Set up the PDH transmit Interface as required. See "Setting PDH
Transmit Interface " page 2.
If INTERFACE [BINARY] is chosen on the
PDH MAIN SETTINGS
display, threshold and polarity choices are available for Data and
Clock.
If INTERFACE [CODED] is chosen on the
PDH MAIN SETTINGS
display, threshold and polarity choices are available for Clock only.
2 Choose the required thresholds.
EXT CLOCK polarity and threshold choices are only available if
CLOCK SYNC [EXT BIN] is chosen on the
PDH MAIN SETTINGS
display.
5
Setting the Interfaces
Setting SDH Transmit Interface
Setting SDH Transmit Interface
Description SDH 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 37717C transmitter and receiver to the same
interface settings choose .
OTHER
SETTINGS CONTROL COUPLED
HOW TO: 1 Make your choice of SIGNAL rate.
If an optical rate is chosen, choose the required wavelength [1550] or
[1310].
If a BINARY rate is chosen, choose the required clock and data
polarity.
If STM-0 is chosen, choose the required interface level.
Choose INTERNAL unless THRU MODE is required. If THRU MODE
is chosen, see "Setting SDH THRU Mode " page 15.
2 Make your choice of CLOCK synchronization source. The RECEIVE
clock sync choice depends on the SDH Receive Interface choice.
3 If required choose the CLOCK (FREQUENCY) OFFSET value. See
“Adding Frequency Offset to SDH Signal” page 37.
6
Setting the Interfaces
Setting SDH Transmit Interface
4 Choose FOREGROUND , BACKGROUND
B/G MAPPING
MAPPING and type of payload. DS1 and DS3 are valid
F/G MAPPING
payload type choices if Option UKJ, Structured PDH or Option 110
DSn SPDH is fitted.
Mapping may be selected from a pictorial display by moving the cursor to
MAPPING and pressing .
STM-n
AUG
STM-0
x1
SET
AU-4-4C
AU-4 VC-4
x3
AU-3
VC-4-4C
VC-3
x3
TUG-3 TU-3
x7
TUG-2
C4-4c BULK
C4 BULK
140 Mb/s
VC-3
34 Mb/s
x7
TU-2
x3
TU-12
x4
TU-11
VC-2
VC-12
VC-11
DS3
C3 BULK
C2 BULK
2M Async
2M Float
C12 BULK
DS1 Async
Use and to move between AU Layer Selection, TU Layer
Selection and Payload Layer Selection. Use and to set the
mapping and to set your selection.
SET
5 If TU-2 mapping is chosen, TU CONCATENATION selection is
enabled, choose OFF or the tributary at which the concatenation
begins, TU2-2C through TU2-6C.
The BACKGROUND, PATTERN IN OTHER TU2’s is fixed at
NUMBERED, that is, each TU-2 contains a unique number to allow
identification in case of routing problems.
6 If TU-3, TU-2, TU-12 or TU-11 mapping is chosen, choose the test
tributary CHANNEL. Including the STM-1 for an STM-4 signal.
7 Choose the payload framing under PAYLOAD TYPE or TU PA YLOAD .
STRUCTURED and INSERT are available if Option UKJ , Structured
PDH or option 110 DSn SPDH is fitted.
If STRUCTURED is chosen, the Payload test signal must be set up.
7
Setting the Interfaces
Setting SDH Transmit Interface
See “Setting Transmit Structured Payload/Test Signal (Options UKJ
or 110)” page 43.
If INSERT is chosen, see “Inserting an External PDH Payload/Test
Signal” page 52.
8 Choose the PATTERN type and PRBS polarity.
If your choice matches ITU-T Recommendation O.150, ITU is
displayed alongside your choice.
NOTE If interfacing at STM-0 with a user word pattern chosen then a false frame
synchronization may occur. This is due to the effect of the standard ITU-T G.707
scrambling used at STM-0 when applied to a fixed payload.
The scrambler may produce a false (F628) frame synchronization from the fixed
payload. At STM-0 only a single F628 pattern is available for frame synchronization.
If the false pattern is detected by the receiver this will result in frame synchronization
being indicated but multiple alarms will occur . If this condition is suspected, change
the PATTERN choice to PRBS and check that the multiple alarms are cleared when
proper frame synchronization is achieved.
9 If required, choose DS1/2M/34M/DS3/140M OFFSET value. See
“Adding Frequency Offset to SDH Signal” page 37.
10 If 2 Mb/s framing PCM30 or PCM30CRC is chosen, set the CAS ABCD
bit value. See "Setting up Signaling Bits " page 40.
11 Choose the mapping required in the background (non-test) TUG-3s.
Refer to Appendix A for a table of background patterns for AU-3 and
TUG-3.
12 If TU-12 mapping is chosen for the test TUG-3, choose the PA TTERN
IN OTHER TU-12s (from 2E9-1, 2E15-1 or 1100).
8
Setting the Interfaces
Setting Jitter Transmit Interface
Setting Jitter Transmit Interface
Description: You can add jitter to the transmitted PDH or SDH signal at all ETSI
rates. You can source the jitter modulation internally or from an external
source.
HOW TO: 1 If you are adding jitter to the PDH signal, set up the PDH transmit
interface. See "Setting PDH Transmit Interface " page 2.
If you are adding jitter to the SDH signal, set up the SDH transmit
interface. See "Setting SDH Transmit Interface " page 6.
2 Choose JITTER/WANDER [JITTER].
If you wish to add wander to the PDH or SDH signal, see "Setting
Wander Transmit Interface " page 11.
3 Choose JITTER [ON].
If you wish to perform an Jitter Tolerance measurement, choose
TOLERANCE. See “Measuring Jitter Tolerance” page 103.
If you wish to perform a Jitter Transfer measurement choose
TRANSFER FN. See “Measuring Jitter Transfer” page 106.
9
Setting the Interfaces
Setting Jitter Transmit Interface
4 Choose the modulation source.
If EXTERNAL is chosen, connect the external source to the MOD IN
port of the JITTER TX module. Up to 10 UI of external jitter
modulation can be added at the MOD IN port.
5 Choose the JITTER MASK setting required.
You can choose the jitter range, jitter modulating frequency and jitter
amplitude if OFF is chosen.
If you choose SWEEP, the HP 37717C will "sweep" through the ITU-T
jitter mask (G.823 for PDH or G.958 for SDH) adjusting the jitter
amplitude according to the jitter frequency.
If you choose SPOT, you can choose the "spot" jitter frequency. The
jitter amplitude is adjusted and controlled according to your jitter
frequency choice.
TIP: If when using the SWEPT MASK capability a problem occurs around a
certain frequency, this may require closer examination. Stop the sweep
at that point by choosing SPOT. You can then control the "spot" jitter
frequency to make closer examination of the problem.
10
Setting the Interfaces
Setting Wander Transmit Interface
Setting Wander Transmit Interface
Description: You can add Wander to the 2 Mb/s PDH signal and the STM-1 and
STM-4 SDH signal. An external 2 Mb/s clock must be connected to the
2M REF IN port of the Jitter TX module.
HOW TO: 1 Connect an external 2 Mb/s clock to the 2M REF port of the Jitter TX
module.
2 If you are adding jitter to the 2 Mb/s PDH signal set up the PDH
transmit interface and choose CLOCK SOURCE [EXT JITTER]. See
"Setting PDH Transmit Interface " page 2.
If you are adding jitter to the STM-1 or STM-4 SDH signal set up the
SDH transmit interface and choose an external CLOCK SOURCE. See
"Setting SDH Transmit Interface " page 6.
3 Choose JITTER/WANDER [WANDER].
If you wish to add jitter to the PDH or SDH signal, see "Setting Jitter
Transmit Interface " page 9.
4 Choose WANDER [ON].
11
Setting the Interfaces
Setting Wander Transmit Interface
5 Choose the modulation source.
If EXTERNAL is chosen, connect the external source to the MOD IN
port of the JITTER TX module.
Up to 10 UI of external wander modulation can be added at the MOD
IN port.
6 Choose the WANDER MASK setting required.
You can choose the wander modulating frequency and wander
amplitude if OFF is chosen.
If you choose SPOT, you can choose the "spot" wander frequency. The
wander amplitude is adjusted and controlled according to your wander
frequency choice.
12
Setting the Interfaces
Selecting the Physical Transmit Interface for ATM Payloads
Selecting the Physical Transmit Interface for
ATM Payloads
Description ATM transmit physical layer settings should match the network
equipment settings in the same way as the SDH and PDH transmit
interfaces. The Interface selections available are determined by the
PDH/DSn and SDH/SONET modules fitted to your instrument.
Your selections are automatically transferred to the other TRANSMIT
displays. Selection of STM-4 OPTICAL signal at the ATM PHYSICAL
LAYER will cause the transmitter output SDH to change to STM-4
OPTICAL.
TIP: If you wish to set the HP 37717C transmitter and receiver to the same
interface settings choose .
OTHER
SETTINGS CONTROL COUPLED
HOW TO: 1 Make your choice of SIGNAL rate.
If an optical rate is chosen, choose the required wavelength.
Choose INTERNAL unless THRU MODE is required. Jitter may be
introduced into an STM-1, 140Mb/s, 32Mb/s or 2Mb/s signal with ATM
payload if THRU MODE is chosen.
2 Make your choice of CLOCK synchronization source. At SDH rates,
the RECEIVE clock sync choice is dependent upon the SDH Receive
13
Setting the Interfaces
Selecting the Physical Transmit Interface for ATM Payloads
Interface choice.
3 If the 2Mb/s rate is selected, select CRC-4 MULTIFRAME or
.
OFF
ON
4 If the 140Mb/s or 34Mb/s rate is selected, select the TRAIL TRACE
message type:
For the standard trail trace message”HP37717C” set TRAIL TRACE
to .
TEST
For a unique 15 character message, set TRAIL TRACE to
TIP: If is selected, use for a pop-up menu to select the message
USER
SET
USER
characters.
14
Setting the Interfaces
Setting SDH THRU Mode
Setting SDH THRU Mode
Description THRU mode is used to non-intrusively monitor SDH lines where no
protected monitor points are available.
Since THRU mode locks most user settings, you must set AU, rate,
mapping and payload before selecting THRU mode.
STM-0, STM-1
You can substitute a new payload, Section overhead (SOH) and Path
overhead (POH) in the received STM-0/1 signal for testing.
15
Setting the Interfaces
Setting SDH THRU Mode
STM-4
With option 130 or 131, the overhead and payload may be overwritten for
AU-4 and AU3. SOH overwrite is available for AU-4-4C.
The Transmitter and receiver settings are automatically coupled in
THRU MODE. To select AU-4, AU3 or AU-4-4C set the receiver
mapping, see "Setting SDH Receive Interface " page 22
HOW TO:
1 Make the PAYLOAD OVERWRITE choice required.
If AU-4, AU-3, TU-3, TU-2 or TU-12 is c hosen, the B1, B2 and B3 BIPs
are recalculated before transmission and the Mapping, Selected TU,
TU Payload, Pattern, Tributary Offset and Pattern in other TU’s
settings are displayed. To choose the settings in these, see "Setting
SDH Transmit Interface " page 6, steps 4 through 10.
2 Make the SOH+POH OVERWRITE choice required.
Y ou can only modify those overhead bytes available under
SDH TEST FUNCTION SDH
: Errors & Alarms, Sequences,
TRANSMIT
Overhead BER, MSP Messages, DCC Insert and Stress Test.
The B1, B2 and B3 BIPs are recalculated before transmission.
16
Setting the Interfaces
Using Autosetup
Using Autosetup
Description The Autosetup function allows you to speed up the configuration of the
instrument when making PDH or SDH measurements.
Autosetup will search the interface chosen on the display
and attempt to configure the instrument to match the received signal.
Autosetup will detect ATM or any of the PRBS patterns the transmitter
can generate. ATM is considered to be a payload of PDH or SDH.
Both MONITOR and TERMINATE modes are tried in the search for a
received signal.
HOW TO: 1 Connect the HP 37717C to the network and select the required
RECEIVE
2 Press .
The display will show an Autosetup HELP page.
interface on the HP 37717C.
AUTO SETUP
OTHER
RECEIVE
SDH Input
If an STM-4 interface is chosen, the search will start on the STM-1
selected for test. All SDH line rates are searched for an electrical, optical
or binary signal.
If a signal is found, a search of payloads will start.
17
Setting the Interfaces
Using Autosetup
The payload search starts with VC-4-4C in STM-4 and continues with
ATM, TU-3 (AU-4), VC-3 (A U-3), TU-2 (AU-3/AU-4), VC-4 (A U-4), TU-12
(AU-3/AU-4), TU-11 (AU-3/AU-4).
For each pa yload a search is made to find a framing pattern. If a framing
pattern is found, a search for PRBS patterns is made.
TIP: If it is known that the signal of interest is in a particular STM-1 e.g.
number 3, then the Autosetup search can be speeded up by setting the
RECEIVE
for a signal will then start in STM-1 number 3.
display MAPPING [FOREGROUND] to STM-1 [3]. The search
PDH Input
In PDH there are three framing possibilities for 140 Mb/s, 34 Mb/s, 8 Mb/
s and 2 Mb/s, (34Mb/s, DS3, 2M and DS1 for option 110) namely
Unframed, Framed and Structured.
NOTE Structured is not covered by Autosetup because searching through a
PDH framing structure would take an unacceptable amount of time.
All line rates are searched for a signal. If a signal is found, a search for
framing pattern is made. All possible framing structures are searched,
except for Structured.
If a framing pattern is found, a search for PRBS pattern is made.
18
Setting the Interfaces
Setting PDH Receive Interface
Setting PDH Receive Interface
Description PDH Receive interface settings should match the network equipment
settings of Rate, Termination and Line Code and determine the Payload
to be tested.
TIP: If you wish to set the HP 37717C transmitter and receiver to the same
interface settings choose .
OTHER
SETTINGS CONTROL COUPLED
HOW TO: 1 Choose the required SIGNAL source.
2 If Binary Interfaces, Option UH3, is fitted, choose the INTERFACE
required. See "Setting PDH Receive Binary Interface " page 21.
3 If you have chosen 2 Mb/s as the PDH signal rate, choose the required
impedance (TERMINATION). At all other rates the impedance is
fixed.
4 If you have chosen 2 Mb/s, 8 Mb/s or DS1 (option 110) as the PDH
signal rate, choose the required LINE CODE. At 140 Mb/s, 34 Mb/s
and DS3 coding is fixed.
5 If you are measuring at the network equipment monitor point set the
LEVEL field to MONITOR.
19
Setting the Interfaces
Setting PDH Receive Interface
6 The received signal will be 20 to 26 dB below the normal level. To
return the received signal to normal, choose the required GAIN level.
The received signal may also require EQUALIZATION to compensate
for cable losses.
7 Choose the required Payload Type.
If Structured is chosen, the PDH test signal must be set up. See
“Setting Transmit Structured Payload/Test Signal (Options UKJ or
110)” page 43.
If you choose 2 Mb/s as the PDH signal rate, the Framed choice is
expanded to provide a menu of 2 Mb/s framing types.
8 Choose the required PATTERN.
9 Choose the required PRBS POLARITY.
If your PRBS Polarity choice matches ITU-T Recommendation O .150,
ITU is displayed alongside your choice.
20
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