Wavetek ANT-20 User manual

BN 3060/98.26
ANT-20SE
Advanced Network Tester
Optical Interfaces up to 155 Mbit/s
BN 3060/91.01 and BN 3060/91.02
Optical Interfaces up to 622 Mbit/s
BN 3060/91.11 and BN 3060/91.12
Optical Interfaces STM-16/OC-48
BN 3060/91.50 through BN 3060/91.53
Optical Interfaces STM-64/OC-192
BN 3060/91.40 through BN 3060/91.42
Drop&Insert
BN 3060/90.10
in combination with Optical Interfaces
Software Version 7.20
Operating Manual
4

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 or parts 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 is not
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: John Nutley
Order no.: BN 3060/98.26
Edition: 02/00.07 (V 7.20)
Previous edition:
01/00.04 (V 7.1)
Subject to change without notice
Our normal guarantee and delivery
terms apply
Printed in Germany

ANT-20SE Optical Interfaces
i
Contents
Introduction
1 Optical interfaces for signals up to STM-64/OC-192. . . . . . . . . . . . .I-1
2 SOH/TOH loading and analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I-1
3 Drop&Insert function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I-1
4 ADM Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I-1
5 Optical power splitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I-2
6 STM-16/OC-48 Module connector panel. . . . . . . . . . . . . . . . . . . . . . .I-3
7 STM-64/OC-192 Module connector panel. . . . . . . . . . . . . . . . . . . . . .I-4
Maintenance
1 Important safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .M-1
2 Cleaning the optical interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . .M-2
3 Installing the optical interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .M-3
3.1 Safety precautions for preventing electrical accidents . . . . .M-3
3.2 Measures for preventing electrostatic damage . . . . . . . . . . .M-3
3.3 Important operating information . . . . . . . . . . . . . . . . . . . . . .M-4
3.4 Installation instructions STM-16/OC-48. . . . . . . . . . . . . . . . .M-5
3.4.1 ANT-20SE operation with the STM-16/OC-48 modules . . . .M-5
3.5 Installation instructions STM-64/OC-192. . . . . . . . . . . . . . . .M-7
3.6 Affixing the laser safety warning labels. . . . . . . . . . . . . . . . .M-8
Specifications STM-0/1/4/OC-1/3/12
1 Generator section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1
1.1 Digital signal output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-1
1.1.1 Signal output [18], optical . . . . . . . . . . . . . . . . . . . . . . . . . . .S-1
1.2 Clock generator and bit rates . . . . . . . . . . . . . . . . . . . . . . . .S-2
1.2.1 Clock generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-2
1.2.2 Bit rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-2

Optical Interfaces ANT-20SE
ii
1.3 SDH and SONET TX signals . . . . . . . . . . . . . . . . . . . . . . . . S-2
1.3.1 STM-4 TX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2
1.3.2 STM-1 TX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2
1.3.3 STM-0 TX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
1.3.4 OC-12 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
1.3.5 OC-3 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
1.3.6 OC-1 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
1.3.7 Scrambling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-3
1.3.8 Overhead generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-4
1.3.8.1 Section overhead (SOH), Transport Overhead (TOH) . . . . . S-4
1.3.9 Error insertion (anomalies) . . . . . . . . . . . . . . . . . . . . . . . . . . S-5
1.3.10 Alarm generator (defects). . . . . . . . . . . . . . . . . . . . . . . . . . . S-6
1.4 Output signals for the ADM Tester . . . . . . . . . . . . . . . . . . . . S-7
1.4.1 Optical output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-7
1.4.2 PDH output signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-7
2 Receiver section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-8
2.1 Digital signal inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-8
2.1.1 Signal input [17], optical . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-8
2.1.2 Signal input [16], electrical . . . . . . . . . . . . . . . . . . . . . . . . . . S-9
2.1.3 Clock recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-9
2.2 SDH and SONET RX signals . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.1 STM-4 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.2 STM-1 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.3 STM-0 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.4 OC-12 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.5 OC-3 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.6 OC-1 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-10
2.2.7 Descrambling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11
2.3 Measurement modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11
2.3.1 Alarm detection (defects) . . . . . . . . . . . . . . . . . . . . . . . . . . S-11
2.3.2 Error measurements (anomalies) . . . . . . . . . . . . . . . . . . . . S-11
2.3.3 Section overhead (SOH) and
transport overhead (TOH) evaluation . . . . . . . . . . . . . . . . . S-12
3 Optical power splitter BN 3035/90.49 . . . . . . . . . . . . . . . . . . . . . . . S-13
3.1 Wavelength ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-13
3.2 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-13

ANT-20SE Optical Interfaces
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4 Drop&Insert / Through Mode / Block&Replace . . . . . . . . . . . . . .S-14
4.1 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-14
4.1.1 Clock generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-17
4.1.2 Overhead generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-17
4.1.3 Anomaly insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-17
4.1.4 Defect generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-18
4.1.5 Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-18
4.2 Signal outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-19
4.2.1 AUXILIARY signal output [11], electrical. . . . . . . . . . . . . . .S-19
4.2.2 LINE/AUXILIARY signal output [13], electrical . . . . . . . . . .S-19
4.3 Signal inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-20
4.3.1 AUXILIARY signal input [10], electrical. . . . . . . . . . . . . . . .S-20
4.3.2 LINE/AUXILIARY signal input [12], electrical . . . . . . . . . . .S-20
Specifications STM-16/OC-48
1 Generator section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-23
1.1 Digital signal output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-23
1.1.1 Signal output [47], optical . . . . . . . . . . . . . . . . . . . . . . . . . .S-23
1.1.2 Signal output [46], electrical . . . . . . . . . . . . . . . . . . . . . . . .S-24
1.2 Clock generator and bit rates . . . . . . . . . . . . . . . . . . . . . . .S-24
1.2.1 Clock generation internal. . . . . . . . . . . . . . . . . . . . . . . . . . .S-24
1.2.2 Clock generation external [45]. . . . . . . . . . . . . . . . . . . . . . .S-24
1.2.3 Bit rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-24
1.2.4 Clock output [41] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-25
1.3 SDH and SONET TX signals. . . . . . . . . . . . . . . . . . . . . . . .S-25
1.3.1 STM-16 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-25
1.3.2 OC-48 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-25
1.3.3 Scrambling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-25
1.3.4 Overhead generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-26
1.3.4.1 Section overhead (SOH), Transport overhead (TOH). . . . .S-26
1.3.5 Error insertion (anomalies) . . . . . . . . . . . . . . . . . . . . . . . . .S-28
1.3.6 Alarm generator (defects) . . . . . . . . . . . . . . . . . . . . . . . . . .S-28
1.4 Output signals for the ADM Tester . . . . . . . . . . . . . . . . . . .S-29
1.4.1 Optical output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-29
1.4.2 PDH output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-29

Optical Interfaces ANT-20SE
iv
2 Receiver section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-30
2.1 Digital signal inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-30
2.1.1 Signal input [44], optical . . . . . . . . . . . . . . . . . . . . . . . . . . . S-30
2.1.2 Signal input [43], electrical . . . . . . . . . . . . . . . . . . . . . . . . . S-31
2.1.3 Clock output [42]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-31
2.2 SDH and SONET RX signals . . . . . . . . . . . . . . . . . . . . . . . S-32
2.2.1 STM-16 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-32
2.2.2 OC-48 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-32
2.2.3 Descrambling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-32
2.3 Measurement modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-33
2.3.1 Alarm detection (defects) . . . . . . . . . . . . . . . . . . . . . . . . . . S-33
2.3.2 Error measurements (anomalies) . . . . . . . . . . . . . . . . . . . . S-33
2.3.3 Section overhead (SOH) #1,
Transport overhead (TOH) #1 evaluation. . . . . . . . . . . . . . S-34
3 Optical power splitter BN 3035/90.49 . . . . . . . . . . . . . . . . . . . . . . . S-35
3.1 Wavelength ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-35
3.2 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-35
4 Drop&Insert / Through Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-36
4.1 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-36
4.1.1 Clock generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-38
4.1.2 Overhead generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-38
4.1.3 Anomaly insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-38
4.1.4 Defect generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-38
4.1.5 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-38
4.2 Signal outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-39
4.2.1 Signal output [15], electrical . . . . . . . . . . . . . . . . . . . . . . . . S-39
4.2.2 LINE/AUXILIARY signal output [13], electrical . . . . . . . . . . S-39
4.3 Signal inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-40
4.3.1 AUXILIARY signal input [10], electrical. . . . . . . . . . . . . . . . S-40
4.3.2 LINE/AUXILIARY signal input [12], electrical . . . . . . . . . . . S-41
5 Additions for SOH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-42
5.1 Generator section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-42
5.1.1 Overhead generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-42
5.1.1.1 Section overhead (SOH), Transport overhead (TOH) . . . . S-42

ANT-20SE Optical Interfaces
v
5.1.2 Error insertion (anomalies) . . . . . . . . . . . . . . . . . . . . . . . . .S-43
5.2 Receiver section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-45
5.2.1 Section overhead (SOH),
Transport overhead (TOH) evaluation. . . . . . . . . . . . . . . . .S-45
Specifications STM-64/OC-192
1 Generator section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-47
1.1 Digital signal output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-47
1.1.1 Signal output [103], optical . . . . . . . . . . . . . . . . . . . . . . . . .S-47
1.2 Clock generator and bit rates . . . . . . . . . . . . . . . . . . . . . . .S-48
1.2.1 Internal clock generation. . . . . . . . . . . . . . . . . . . . . . . . . . .S-48
1.2.2 External clock generation [101]. . . . . . . . . . . . . . . . . . . . . .S-48
1.2.3 Bit rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-48
1.2.4 Clock output [102] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-48
1.2.5 Frame trigger output [100]. . . . . . . . . . . . . . . . . . . . . . . . . .S-48
1.3 SDH and SONET TX signals. . . . . . . . . . . . . . . . . . . . . . . .S-49
1.3.1 STM-64 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-49
1.3.2 OC-192 TX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-49
1.3.3 Scrambling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-49
1.3.4 Overhead generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-50
1.3.4.1 ITU-T Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-52
1.3.4.2 ANSI Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-55
1.3.5 Error insertion (anomalies) . . . . . . . . . . . . . . . . . . . . . . . . .S-57
1.3.6 Alarm generator (defects) . . . . . . . . . . . . . . . . . . . . . . . . . .S-57
2 Receiver section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-58
2.1 Digital signal input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-58
2.1.1 Signal input [113], optical . . . . . . . . . . . . . . . . . . . . . . . . . .S-58
2.2 Outputs for RX clock and frame trigger. . . . . . . . . . . . . . . .S-59
2.2.1 Clock output [112] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-59
2.2.2 Frame trigger output [110]. . . . . . . . . . . . . . . . . . . . . . . . . .S-59
2.3 SDH and SONET RX signals . . . . . . . . . . . . . . . . . . . . . . .S-59
2.3.1 STM-64 RX signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-59
2.3.2 OC-192 RX signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-59
2.3.3 Descrambling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-59

Optical Interfaces ANT-20SE
vi
2.4 Measurement modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-60
2.4.1 Alarm detection (defects) . . . . . . . . . . . . . . . . . . . . . . . . . . S-60
2.4.2 Error measurements (anomalies) . . . . . . . . . . . . . . . . . . . . S-60
2.4.3 Section overhead (SOH) #1 to #64,
Transport overhead (TOH) #1 to #192 evaluation . . . . . . . S-61
3 Optical power splitter BN 3035/90.49 . . . . . . . . . . . . . . . . . . . . . . . S-62
3.1 Wavelength ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-62
3.2 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-62
4 Note for ANT-20SE users. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-63

ANT-20SE Optical Interfaces
Introduction I-1
Introduction
Glass optical fibers are generally used as the transmission medium for SDH, SONET and ATM
networks. Increasing integration has meant that the optical line equipment forms part of the
network elements. The test equipment used for testing these elements must therefore be fitted
with optical interfaces.
1 Optical interfaces for signals up to STM-64/OC-192
The ANT-20SE provides optical interfaces for signals from 52 Mbit/s (STM-0/OC-1) to
9953 Mbit/s (STM-64/OC-192) in a single, compact instrument.
2 SOH/TOH loading and analysis
A wide range of functions for simulation and analysis of informations are provided in the
overhead, e.g. editor and monitor, together with bit error measurements and a V.11 interface for
DCCs and a path trace feature for J0 through J2. This permits precise assessment of the SDH/
SONET-specific characteristics of the network elements.
3 Drop&Insert function
(not for STM-64/OC-192)
When equipped with the Drop & Insert function, the ANT-20SE provides access to all layers
below the transmission rate. This function also includes loop-through operation. The ANT-20SE
can thus be inserted into the optical path instead of using the optical power splitter to extract the
signal.
4 ADM Tester
(not for STM-64/OC-192)
In “ADM Tester” mode, the ANT-20SE generates an optical output signal in addition to the
transmitted PDH signal. This optical signal can be used to test devices that disable their optical
outputs if no optical input signal is present (laser safety disable function).

Optical Interfaces ANT-20SE
I-2 Introduction
5 Optical power splitter
The ANT-20SE has a built-in optical power splitter. Looping the optical path through the splitter
provides a transparent optical monitoring point. The ANT-20SE can thus perform in-service
analysis of the signals on the optical path.

ANT-20SE Optical Interfaces
Introduction I-3
6 STM-16/OC-48 Module connector panel
Fig. I-1 STM-16/OC-48 Module connector panel
OptionBN3035/90.54 (1310 nm)
OptionBN3035/90.53 (1550 nm)
OptionBN3035/90.59 (1550/1310 nm)
OptionBN3035/91.54 (1310 nm)
OptionBN3035/91.53 (1550 nm)
OptionBN3035/91.59 (1550/1310 nm)

Optical Interfaces ANT-20SE
I-4 Introduction
7 STM-64/OC-192 Module connector panel
Fig. I-2 STM-64/OC-64 Module connector panel

ANT-20SE Optical Interfaces
Maintenance M-1
Maintenance
1 Important safety instructions
The following options for the ANT-20SE are fitted with laser output devices:
•BN 3035/90.40 through BN 3035/90.59
•BN 3035/91.40
•BN 3035/91.41
•BN 3035/91.53 through BN 3035/91.59
Optical radiation with wavelengths in the range 1300 to 1600 nm is present at sockets [18], [47]
and [103].
Maintenance and repair work on the laser sources should only be carried out by qualified
service operatives familiar with the risks involved.
The laser source is active if the yellow LED next to the connector is on.
The output power at socket [18] of the STM-4/OC-12 module is within the limits for a
CLASS 1 LASER PRODUCT.
The output power at socket [47] or [103] of the STM-16/OC-48 module or STM-64/OC-192 is
also within the limits for a CLASS 1 LASER PRODUCT (IEC 825-1: 1993) during normal
operation. Under fault conditions, the output power level may exceed these limits and the output
is then a CLASS 3A LASER PRODUCT (IEC 825-1: 1993).
Fig. M-1 ANT-20SE optical connections
Caution
Invisible laser radiation
Laser light can cause irreparable damage to the eyes, particularly to the retina.
⇒Never look directly into the generator outputs [18], [47] and [103] or the connector end
surfaces of the connected cables (free ends) if the laser sources are activated.
⇒Never use a microscope to check the generator outputs if the laser sources are activated.
⇒Do not activate the laser sources until all measurement connections have been made.
LASER ON
OC-1/3/12
18
STM-1/4 LASER ON
47
DATA
Mainframe STM-16/OC-48 Module
0 dBm LASER ON
103
DATA
STM-64/OC-192 Module
0 dBm

Optical Interfaces ANT-20SE
M-2 Maintenance
2 Cleaning the optical interfaces
Follow the instructions below when cleaning the optical interfaces [17], [18], [44], [47], [103] and
[113] (see Fig. M-2):
1. Always observe the laser safety precautions!
2. Remove the test adapter and protective cap (a).
The internal plug pin is now easily accessed.
3. If the plug pin is very dirty, dab it lightly with a piece of adhesive tape (e.g. Scotch “Magic
tape”), then remove the tape (b).
For on-site cleaning, we recommend the use of “Cleaning tape for optical connectors”, BN
2229/90.07.
4. If the plug pin is not very dirty, dampen a lint-free paper tissue with isopropanol and wipe off
the end surface of the plug pin (c).
5. Dry off the end surface of the plug pin using a dry paper tissue (d).
6. Blow out the test adapter and protective cap using clean, compressed air.
7. Replace the test adapter and protective cap on the connector.
Fig. M-2 Cleaning the test connectors
A suitable microscope is required for inspecting the plug end surfaces. This should have a
magnification of about 200 x.
Paper tissue
(dry)
Paper tissue
(damped)
17 18
OC-1/3/12
LASER ON
Test adapterPlug pin
Cleaning tape
End surface
Protective cap
b)
c) d)
STM-1/4
a)

ANT-20SE Optical Interfaces
Maintenance M-3
3 Installing the optical interface
3.1 Safety precautions for preventing electrical accidents
Opening covers or removing parts with a tool can expose live parts. Terminal points may also
be live.
Disconnect the instrument from all voltage sources before opening it. If calibration, maintenance
or repair of the open instrument must be carried out with power connected, then this should be
performed by a trained technician who is familiar with the risks involved.
Capacitors in the instrument may retain charge even when the instrument has been
disconnected from all voltage sources. Heed the circuit diagrams!
3.2 Measures for preventing electrostatic damage
Electrostatic charges and fields can damage or even destroy semiconductors.
It is thus necessary to protect all semiconductor components used in this instrument against
electrostatic charges and fields.
When the instrument is closed, this is no problem. When the instrument is open, electrostatically
susceptible boards and subassemblies are designated with the DIN 40 021 warning symbol.
Special measures must be taken to protect these boards and subassemblies.
Fig. M-3 Warning symbol to DIN 40 021
Special measures
Grounded person Only “grounded persons” working at an electrostatically protected
workstation may reach into the instrument.
Wristband The technician must be grounded via the wristband of the
electrostatically protected workstation.
Grounding cable The grounding cable is connected to ground (earth) potential.
The following can be considered to be at ground potential:
•the instrument ground jack
•the protective earth connection
•another device at ground potential

Optical Interfaces ANT-20SE
M-4 Maintenance
3.3 Important operating information
Caution
Destruction of input [44]
The maximum input level of -8 dBm must not be exceeded. Otherwise, the optical input can be
destroyed.
⇒Insert an optical attenuator in any case:
– for RX - TX loop operation
– for higher input levels
Caution
Destruction of input [103]
The maximum input level of 0 dBm must not be exceeded. Otherwise, the optical input can be
destroyed.
⇒Insert an optical attenuator in any case for higher input levels.
Caution
Damage to the optical inputs and outputs
The optical input and output can be damaged if the connecting cables are inserted at an angle
when connecting up.
⇒Make sure that the angle of the connecting cable to the connector does not exceed 10°.
⇒Make sure that the tongue on the connector of the cable is fitted exactly in the slot of the
adapter before you do up the screw fastening of the connecting cable.

ANT-20SE Optical Interfaces
Maintenance M-5
3.4 Installation instructions STM-16/OC-48
Preparation
1. Disconnect the ANT-20SE from the AC line and all test circuits.
2. Heed the measures for preventing electrostatic damage.
Do not remove the STM-16/OC-48 optical interface from its package until you are ready to
install it.
3. Place the ANT-20SE with its screen upwards. The side with the connectors should be facing
you.
Installation
To install the STM16/OC-48 optical interface, proceed as follows:
1. Remove the “Extension slot” cover plate, two screws.
2. Remove the dummy plate, four screws.
3. Open the bag containing the optical interface STM-16/OC-48.
The bag protects the interface module from electrostatic damage.
4. Remove the interface module.
5. Remove the premounted cover plate, four screws.
6. Insert the interface module into the “Extension slot”.
7. Screw the interface module to the chassis, four screws.
8. Install the cover plate (four screws).
9. Affix the laser safety warning label for a Class 3A laser product (see Fig. M-7).
3.4.1 ANT-20SE operation with the STM-16/OC-48 modules
The STM-16/OC-48 modules with their specific wavelengths can be operated only in a certain
ANT-20SE slot position (see Fig. M-4). The slot position depends on whether the “2488 Mbit/s
Jitter Analyzer/Generator” module (BN 3035/90.68) is simultaneously fitted or not.
Removing the module
1. Disconnect the ANT-20SE from the AC line and all test circuits.
2. Heet the measures for preventing electrostatic damage.
3. Remove the cover plate (two screws).
The four screws fixing the module are accessible.
4. Remove the four screws.
5. Remove the module.
•Wavelength 1550 nm: BN 3035/90.53 or BN 3035/91.53
•Wavelength 1310 nm: BN 3035/90.54 or BN 3035/91.54
•Wavelength 1310 and 1550 nm: BN 3035/90.59 or BN 3035/91.59

Optical Interfaces ANT-20SE
M-6 Maintenance
Inserting the module
1. Insert the module in the scheduled slot position (see Fig. M-4).
2. Fix the module with the four screws.
3. Mount the cover plate again.
If the STM-16/OC-48 module shall be operated in combination with the “2488 Mbit/s Jitter Ana-
lyzer/Generator” module, both modules have to be balanced to each other.
Each STM-16/OC-48 module can be installed in each ANT-20SE without changing the soft-
ware.
Fig. M-4 Slots for the STM-16/OC-48 modules
BN 3035/91.59 active BN 3035/91.59 active
PC
PC
SDH/SONET/ATM
up to 622 Mbit/s SDH/SONET/ATM
up to 622 Mbit/s
Jitter up to 622 Mbit/s
Jitter up to 622 Mbit/s
slotslot
Jitter 2.5 Gbit/s
ANT-20SE
with
Jitter 2.5 Gbit/s
ANT-20SE
without
Jitter 2.5 Gbit/s
BN 3035/90.53, BN 3035/91.53 or
BN 3035/90.54, BN 3035/91.54 or
BN 3035/90.59, BN 3035/91.59

ANT-20SE Optical Interfaces
Maintenance M-7
3.5 Installation instructions STM-64/OC-192
The STM-64/OC-192 module comprises up to four separate boards (depending on the options)
that are bolted together. The PS interface (power supply interface) is used to connect to the
motherboard. All parts are pre-assembled.
Fig. M-5 Installing the STM-64/OC-192 optical interface
Preparation
1. Disconnect the ANT-20SE from the AC line and all test circuits.
2. Heed the measures for preventing electrostatic damage.
Do not remove the STM-64/OC-192 optical interface from its package until you are ready to
install it. The bag protects the interface module from electrostatic damage.
3. Remove the four screws (A) securing the lower case shell.
4. Remove the lower case shell.
5. Remove the seven countersunk screws (B) from the chassis pan.
6. Remove the three “Extension Slot” cover plates (two screws each).
7. Remove the three blanking panels (four screws each).
B (chassis pan)
STM-64/OC-192 Module
Cover plate
“Extension Slot”
C
Lower case
A
(BN 3035/91.40: four boards)
(BN 3035/91.41, BN 3035/91.42: three boards)
Back panel
D
shell
PS interface

Optical Interfaces ANT-20SE
M-8 Maintenance
Installation
To install the STM-64/OC-192 optical interface, proceed as follows:
1. Open the bag containing the STM-64/OC-192 optical interface and take out the interface
module.
2. Remove the pre-assembled cover plate by undoing the six screws (C).
3. Fit the interface module into the “Extension Slot”.
4. Bolt the back panel of the interface module to the chassis with the eight screws (D).
5. Bolt the interface module to the chassis pan with the seven countersunk screws (B).
6. Fit the cover plate using the six screws (C).
7. Fit the lower case shell in position.
8. Bolt on the lower case shell with the four screws (A).
9. Affix the laser safety label for Class 3A (see Fig. M-7).
3.6 Affixing the laser safety warning labels
A laser safety warning label in the local language indicating the laser class must be affixed to
the outside of the ANT-20SE in such a position that it is clearly visible to the user.
Fig. M-6 Laser class safety warning labels
We recommend that the laser safety warning label is affixed to the front panel of the ANT-20SE
below socket [05] (see Fig. M-7).
Use the following laser safety warning labels:
•CLASS 1 LASER PRODUCT
for Options BN 3035/90.43 through 90.48
•CLASS 3A LASER PRODUCT
for Options BN 3035/90.53, BN 3035/90.54, BN 3035/90.59, BN 3035/91.53,
BN 3035/91.54, BN 3035/91.59, BN 3035/91.40 and BN 3035/91.41
A sheet of laser safety warning labels is included with each module.
INVISIBLE LASER RADIATION
DO NOT STARE INTO BEAM OR VIEW
DIRECTLY WITH OPTICAL INSTRUMENTS
CLASS 3A LASER PRODUCT
CLASS 1
LASER PRODUCT