Wavetek ANT-20 User manual
BN 3035/98.34
ANT-20, ANT-20E
Advanced Network Tester
Extended Overhead Analysis
BN 3035/90.15
Software Version 7.20
Operating Manual
1
Please direct all enquiries to your
local Wavetek Wandel Goltermann sales
company. The addresses are given at the
end of this handbook.
Copyrights
This product orparts of it are based upon
Recommendations and/or Standards of the
Standardization Sector of the International
Telecommunication Union- ITU-T and/or of the
European Telecommunications Standards Institute -
ETSI. These Recommendations and Standards are
subject to copyrights of these organizations. Without
written permission of the ITU-T and/or ETSI it isnot
permitted to copy ITU-T Recommendations or ETSI
standards or parts thereof and/or make them available
to third parties.
Wavetek Wandel Goltermann
Eningen GmbH & Co.
Mühleweg 5, 72800 Eningen u. A.
© 2000
Author: MDD/TD
Translator: JohnNutley
Order no.: BN 3035/98.34
Edition: 06/00.07(V 7.20)
Previous edition:
05/00.04(V 7.1)
Subject to change without notice.
Our standard terms and conditions
of guarantee and delivery apply.
Printed in Germany
i
ANT-20/ANT-20E Extended Overhead Analysis
Contents
Introduction
1 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I-1
Operation
1 Recording selected bytes (Overhead Capture) . . . . . . . . . . . . . . . .O-1
1.1 Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O-1
1.2 The “Byte Capture” dialog. . . . . . . . . . . . . . . . . . . . . . . . . . .O-2
1.2.1 Setting the trigger conditions. . . . . . . . . . . . . . . . . . . . . . . . .O-2
1.3 Recording results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O-3
1.3.1 Recording K1, K2 bytes, APS channel . . . . . . . . . . . . . . . . .O-3
1.3.2 Recording TCM frames. . . . . . . . . . . . . . . . . . . . . . . . . . . . .O-4
1.3.3 Recording further SOH/TOH or POH bytes. . . . . . . . . . . . . .O-5
1.3.4 Recording when defects are present. . . . . . . . . . . . . . . . . . .O-5
2 Measuring the APS switching or dead time. . . . . . . . . . . . . . . . . . .O-6
2.1 Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O-6
2.2 The “APS Time Measurement” dialog. . . . . . . . . . . . . . . . . .O-6
2.2.1 Setting the switch event . . . . . . . . . . . . . . . . . . . . . . . . . . . .O-7
2.3 Performing an APS measurement. . . . . . . . . . . . . . . . . . . . .O-8
Specifications
1 Overhead Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-1
2 APS switching time measurement . . . . . . . . . . . . . . . . . . . . . . . . . . S-2
ii
Extended Overhead Analysis ANT-20/ANT-20E
Notes:
Introduction I-1
ANT-20/ANT-20E Extended Overhead Analysis
Introduction
1 Functions
The “Extended Overhead Analysis” option provides further useful functions for your ANT-20:
•Recording of selected Section Overhead (SDH) or Transport Overhead (SONET) bytes.
•Recording of selected Low or High Path Overhead (POH) bytes.
•Recording of TCM protocols (Tandem Connection Monitoring) in the N1 / Z6 byte (SONET)
or N1 / N2 byte (SDH).
•Monitoring of TCM alarms in a separate display window.
•Error count of TCM measured values:
–TC-IEC
– TC-Diff (B3-IEC or BIP2-IEC)
– TC-REI
–TC-OEI
•Measurement of the circuit switching or dead time when Automatic Protection Switching
(APS) is used.
This allows you to check simply if the APS protocol is adhered to and that the maximum
permitted switching time is not exceeded.
To simplify this task, the APS codes are output in plain text when bytes K1 and K2 of the
overhead are recorded.
You can also specify maximum value for the APS switching time, to provide a simple PASSED
or FAILED result immediately after the measurement.
The TCM function allows you to investigate the TCM protocols received and carry out an error
count and alarm monitoring.
The settings required are made using the optional dialog windows of the following virtual
instruments:
•Signal Structure (APS)
•Overhead Analyzer (recording overhead bytes)
I-2 Introduction
Extended Overhead Analysis ANT-20/ANT-20E
Notes:
ANT-20/ANT-20E Extended Overhead Analysis
Operation O-1
Operation
1 Recording selected bytes (Overhead Capture)
1.1 Function
The “Capture” function is opened from the “Overhead Analyzer” window. After the byte has
been selected using the cursor, the “Capture” dialog is opened using the Capture menu
command.
The “Capture” function can record a single byte or two bytes simultaneously if bytes K1 and K2
are recorded.
A trigger condition is set to start the recording. When this trigger condition occurs, the
instrument records all changes in the selected byte. The record includes timestamps and the
contents of the byte.
If you set N1/N2 or N1/Z6 as the trigger condition, the function will look for the TCM FAS word.
When it is detected, all bytes will be captured (not just the change). This allows you to capture
and display complete 76 byte protocols.
Fig. O-1 “Overhead Analyzer” window with “CAP” action button (option BN 3035/90.15)
Basic procedure
✓Open the “Overhead Analyzer” window.
✓Set a SDH or SONET signal structure.
1. Mark the required overhead byte, e.g. K1.
2. Click on the “CAP” button.
The “Byte Capture” dialog opens.
2. Open “Capture” function
1. Select byte
Extended Overhead Analysis ANT-20/ANT-20E
O-2 Operation
1.2 The “Byte Capture” dialog
Fig. O-2 “Byte Capture” dialog of the “Overhead Analyzer” window
1.2.1 Setting the trigger conditions
The event that triggers the recording is set from the ‘Source’ list box:
Result list (byte, APS code)
Selected byte
“Compare” and
Selected structure (“Interpreter” dialog)
Trigger source (see table)
Control recording Export, print results
“Compare not” trigger condition
Setting Start condition
Manual Immediately after START.
Compare The content of the selected byte must agree with the compare value.
Don’t care values can be set with ‘X’.
Compare not Inverse of the Compare condition. The record starts when the value no
longer agrees with the compare value.
AU-AIS AIS-P Start when AU-AIS or AIS-P occurs.
AU-LOP LOP-P Start when AU-LOP or LOP-P occurs.
MS-RDI RDI-L Start when MS-RDI or RDI-L occurs.
MS-AIS AIS-L Start when MS-AIS or AIS-L occurs.
N1/N2-TCM N1/Z6-TCM Starts recording TCM frames when the TCM FAS word has occurred
(Tandem Connection Monitoring).
Requirement: The N1/N2 or N1/Z6 byte is activated for Tandem
Connection Monitoring.
Table O-1 Events available from the “Source” list box
ANT-20/ANT-20E Extended Overhead Analysis
Operation O-3
1.3 Recording results
1.3.1 Recording K1, K2 bytes, APS channel
⇒Click the “START” button to prepare to start the recording.
The record starts as soon as the pre-set trigger condition occurs.
The changes in the selected byte are recorded frame by frame with timestamp.
Ending the recording
⇒Recording stops automatically when the buffer is full (max. 200 items)
– or –
⇒Click the “STOP” button.
Result display
Fig. O-3 APS channel results display in “Byte Capture” dialog window
Example
Fig. O-4 Example result
If alarms occur that prevent further byte capture (e.g. LOF) an additional message is output as
follows:
•ALARM BEGIN
•ALARM END
Item no.
Decimal display
Time in
hh:mm:ss.ms
Byte as 2-digit
hexadecimal value
APS code
Bits 1-4: Request Codes for Linear APS
Bits 5-8: (decimal: 0 to 15, bit 8 = LSB)
APS code
Bits 1-4: (decimal: 0 to 15, bit 8 = LSB)
Bit 5:
Bits 6-8:
Bridge Request Code for Ring APS
Destination Node Identifier or Channel No.
Destination Node Identifier or Channel No.
Path Code or MPS Architecture
Status
Extended Overhead Analysis ANT-20/ANT-20E
O-4 Operation
1.3.2 Recording TCM frames
⇒Click the “START” button to prepare for recording.
Recording starts as soon as the TCM FAS word is detected. Complete TCM frames are
captured and displayed. The first eight bytes, which contain the TCM FAS word, are also
output.
Ending the recording
⇒The recording ends automatically when the buffer is full (max. 3.5 complete frames)
– or –
⇒Click the “STOP” button.
Result display
Fig. O-5 TCM frame result display in the “Byte Capture” dialog window
Example
Fig. O-6 Example result
Item no..
Decimal display
Time in
hh:mm:ss.ms
Incoming
Error Count TCM Remote
Error Indication
TCM AIS alarm
indicator
indicator
Outgoing
Error Indication
indicator
Binary value of
N1/N2(Z6) byte
Hexadecimal value of
N1/N2(Z6) byte
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