BN 3035/98. 24
ANT-20, ANT-2 0 E
Advanced Network Tester
M13 MUX/DEMUX
BN 3035/90.32
Drop & Insert
BN 3035/90.20
in combination with
M13 MUX/DEMUX
Software Version 7.20
Operating Manual
5
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 3035/98.24
Edition: 07/00.07 (V 7.20)
Previous edition:
06/00.04 (V 7.1)
Subject to change without notice
Our normal guarantee and delivery
terms apply
Printed in Germany
ANT-20/ANT-20E M13 MUX/DEMUX
i
Contents
Introduction
1 Multiplex and demultiplex functions . . . . . . . . . . . . . . . . . . . . . . . . .I-1
2 Testing switch and sensor functions. . . . . . . . . . . . . . . . . . . . . . . . .I-2
3 In-service monitoring of tributary channels . . . . . . . . . . . . . . . . . . .I-2
Specifications
1 Generator section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-1
1.1 Frame generator, M13 MUX/DEMUX
(option BN 3035/90.32). . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-1
1.2 CRC checksum (DS1 ESF). . . . . . . . . . . . . . . . . . . . . . . . . .S-1
1.3 Justification as per T1.107 or T1.107a . . . . . . . . . . . . . . . . .S-2
1.3.1 PDH tributary offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-2
1.4 Error insertion (anomalies) . . . . . . . . . . . . . . . . . . . . . . . . . .S-2
1.5 Alarm generation (defects) . . . . . . . . . . . . . . . . . . . . . . . . . .S-2
1.6 Test signals for bit error rate measurements. . . . . . . . . . . . .S-3
1.6.1 Internal test signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-3
1.6.2 External signal (with option 3035/90.20 only) . . . . . . . . . . . .S-3
1.6.3 Filler signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-3
2 Receiver section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-4
2.1 Frame systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-4
2.2 Error measurements (anomalies) . . . . . . . . . . . . . . . . . . . . .S-4
2.3 Alarm detection (defects) . . . . . . . . . . . . . . . . . . . . . . . . . . .S-4
2.4 Offset measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-4
2.5 Evaluation of test signals for bit error measurements. . . . . .S-5
2.5.1 Internal evaluation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S-5
2.5.2 External signal (with option BN 3035/90.20 only) . . . . . . . . .S-5
M13 MUX/DEMUX ANT-20/ANT-20E
ii
3 Drop&Insert / Through Mode / Block&Replace . . . . . . . . . . . . . . . S-6
3.1 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-6
3.1.1 Clock generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-7
3.1.2 Anomaly insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-7
3.1.3 Defect generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-7
3.1.4 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-8
3.2 Signal outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-8
3.2.1 AUXILIARY signal output [11], electrical. . . . . . . . . . . . . . . . S-8
3.2.2 LINE/AUXILIARY signal output [13], electrical . . . . . . . . . . . S-8
3.3 Signal inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-9
3.3.1 AUXILIARY signal input [10], electrical. . . . . . . . . . . . . . . . . S-9
3.3.2 LINE/AUXILIARY signal input [12], electrical . . . . . . . . . . . S-10
Introduction I-1
ANT-20/ANT-20E M13 MUX/DEMUX
Introduction
Option BN 3035/90.32
1 Multiplex and demultiplex functions
When equipped with Option BN 3035/90.32, “M13 MUX/DEMUX”, the ANT-20 can generate
and analyze DS3 signals containing 28 DS1 signals. These DS3 signals can also be mapped
into OC-N signals or STM-N and STS-N signals. This allows tests on add/drop multiplexers
equipped with built-in M13 multiplexs or on M13 signals. It is also possible to insert an external
DS1 signal via a connector ot to drop an internal DS1 signal and output it via a connector (Drop
& Insert Option, BN 3035/10.20).
The appropriate signal structures are set in the “Signal Structure” window using the “Signal
Structure Editor”.
Fig. I-1 Testing an add/drop multiplexer (ADM) equipped with M13 multiplexer
I-2 Introduction
M13 MUX/DEMUX ANT-20/ANT-20E
2 Testing switch and sensor functions
Switch functions
SONET network elements process asynchronous (DSn) signals of various hierarchy levels.
Complex, interleaved signal paths occur, particularly in modern SDH network nodes (crossconnects). The linking of the M13 multiplex function to the SONET mapping functions in the
ANT-20 makes the instrument ideal for testing complex switching functions.Tests can be
performed between two SONET ports, two DSn ports or between a SONET and a DSn port.
Alarm sensor test
Comprehensive facilities for inserting errors at the DS1 and DS3 levels allow testing of the
monitor functions built in to the network elements. This is particularly useful during installation
work, as the network management systems are dependent on the correct functioning of these
sensors during subsequent operation.
3 In-service monitoring of tributary channels
The demultiplex function provides access to the tributary channels right down to the DS1 level.
This permits pinpoint in-service monitoring of individual channels in DSn signals and in SONET
signals when the appropriate mappings are employed.
Specifications S-1
ANT-20/ANT-20E M13 MUX/DEMUX
Specifications
Option BN 3035/90.32
1 Generator section
1.1 Frame generator, M13 MUX/DEMUX (option BN 3035/90.32)
The following frames are available:
The multiplexer chain (BN 3035/90.32) allows generation of a completely structured signal with
28 DS1 signals in a DS3 signal.
The DS2 level cannot be manipulated.
1.2 CRC checksum (DS1 ESF)
The ANT-20 calculates the CRC-6 checksum for the measured channel and the filler channels
as per standard T1.107 and inserts the result bits at the appropriate position in the Extended
Super Frame.
Level Bit rate in kbit/s Frames conforming to Notes
DS1 1544 T1.107 SF (D4)
1544 T1.107 ESF (T1.107)
DS2 6312 T1.107 DS3 44736 T1.107 M13
44736 T1.107a C parity
Table S-1 Frame generation
S-2 Specifications
M13 MUX/DEMUX ANT-20/ANT-20E
1.3 Justification as per T1.107 or T1.107a
The bit rates in the upper and subordinate systems are in a fixed relationship to each other.
Justification is at a nominal rate (offset of upper and subordinate systems is identical).
Exception: Insertion of external signals.
M13
C parity
1.3.1 PDH tributary offset
Static offset for the PDH tributary bit rates during insertion into the SONET-SPE container.
The offset is an average value. The actual offset at any given time may be above or below this
value.
1.4 Error insertion (anomalies)
The error types are described in the “Specifications” for the mainframe instrument.
1.5 Alarm generation (defects)
The alarm types are described in the “Specifications” for the mainframe instrument.
The insertion of alarms (defects) or errors (anomalies) are mutually exclusive. The action
selected first is active.
Upper system Justification ratio Justification rate in kbit/s
DS2 0.335 1.8
DS3 0.39 3.544
Table S-2 M13 justification
Upper system Justification ratio Justification rate in kbit/s
DS2 0.073 0.393
DS3 1 9.398
Table S-3 C parity justification
Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 ppm
for all bit rates, relative to SONET-SPE container
Step width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ppm
Specifications S-3
ANT-20/ANT-20E M13 MUX/DEMUX
1.6 Test signals for bit error rate measurements
1.6.1 Internal test signals
Bit patterns as in the mainframe instrument:
1.6.2 External signal (with option 3035/90.20 only)
An external signal with bit rate 1544 kbit/s (coaxial or balanced) can be inserted into the
selected timeslot instead of the bit pattern (see Sec. 1.6.1).
The interfaces for this signal are described in Sec. 3,Page S-6.
1.6.3 Filler signals
Complete structured signals using the pseudo-random bit sequence PRBS 6 are transmitted in
all 64 kbit/s channels.
• Transmitted in all timeslots (framed pattern)
• Transmitted in a selected timeslot
S-4 Specifications
M13 MUX/DEMUX ANT-20/ANT-20E
2 Receiver section
2.1 Frame systems
Frames which can be evaluated by the M13 MUX/DEMUX chain (Option BN 3035/90.32):
One channel is selected as test channel from the 28 DS1 signals.
The DS2 level cannot be evaluated.
2.2 Error measurements (anomalies)
The error measurements are described in the “Specifications” for the mainframe instrument.
The frame alignment signals in all hierarchy stages of the selected path are checked
simultaneously.
2.3 Alarm detection (defects)
The detected alarms are described in the “Specifications” for the mainframe instrument. The
RDI alarms (yellow) in all hierarchy stages of the selected path are checked simultaneously.
2.4 Offset measurements
All offsets in the hierarchy stages of the selected path are measured and displayed
simultaneously.
Display in ppm
Level Bit rate in kbit/s Frames conforming to Notes
DS1 1544 T1.107 SF (D4)
1544 T1.107 ESF (T1.107)
DS2 6312 T1.107 DS3 44736 T1.107 M13
44736 T1.107a C parity
Table S-4 Frame systems for individual system bit rates
Specifications S-5
ANT-20/ANT-20E M13 MUX/DEMUX
2.5 Evaluation of test signals for bit error measurements
2.5.1 Internal evaluation
Evaluation:
• in all timeslots (framed pattern)
• in the selected timeslot
2.5.2 External signal (with option BN 3035/90.20 only)
Output of a signal with bit rate 1544 kbit/s (coaxial or balanced) for external evaluation is
alternative to internal evaluation as described before (see Sec. 2.5.1).
The interfaces for this are described in Sec. 3,Page S-6.
S-6 Specifications
M13 MUX/DEMUX ANT-20/ANT-20E
3 Drop&Insert / Through Mode / Block&Replace
Option BN 3035/90.20
3.1 Functions
This option provides the following functions for all mapping options fitted to the ANT-20.
Drop&Insert
Generator and receiver operate independently as multiplexer and demultiplexer. The signal
from a selected tributary is dropped from the receive signal and output to a connector. An
external signal is inserted into the transmit signal.
Fig. S-1 Drop&Insert: Generator and receiver operate independently
An unbalanced digital input and output are provided on the mainframe instrument for dropping
and for inserting tributary signals (see Sec. 3.2.1,Page S-8 and Sec. 3.3.1,Page S-9).
The mainframe instrument is also equipped with a balanced output [13] and input [12] for
dropping and for inserting tributary signals via balanced interfaces
Through Mode
The received signal is looped through the ANT-20 and re-transmitted by the generator.
The ANT-20 operates in Through Mode as a signal monitor without affecting the signal content.
Fig. S-2 Through Mode: Generator and receiver coupled
The looped-through signal can also be jittered using the Jitter Generator options (Jitter
Generator up to 155 or 622 Mbit/s, BN 3035/90.60 to 61). This function is available for all bit
rates fitted to the instrument.
Specifications S-7
ANT-20/ANT-20E M13 MUX/DEMUX
Fig. S-3 Through Mode: Adding jitter to the looped-through signal
Block&Replace
In PDH mode not possible.
3.1.1 Clock generator
Drop&Insert
As specified in the “Specifications” of the mainframe instrument.
Through Mode
In Through Mode, clock generation is always derived from the receive signal clock.
No signal offset is possible in this operating mode (see also the “Specifications” of the
mainframe instrument).
3.1.2 Anomaly insertion
Drop&Insert
As specified in Sec. 1.4,Page S-2.
Through Mode
Anomaly insertion is not possible.
3.1.3 Defect generation
Drop&Insert
As specified in Sec. 1.5,Page S-2.
Through Mode
Defect generation is not possible.
S-8 Specifications
M13 MUX/DEMUX ANT-20/ANT-20E
3.1.4 Measurements
There are no restrictions on measurements (see Sec. 2,Page S-4).
3.2 Signal outputs
3.2.1 AUXILIARY signal output [11], electrical
3.2.2 LINE/AUXILIARY signal output [13], electrical
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .unbalanced, (coaxial)
Socket type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BNC
Output impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Ω
Max. permitted peak spurious input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 5 V
Interface Bit rate (Mbit/s) Line code Output voltage
E4 139.264 CMI ± 0.5 V
DS3 44.736 B3ZS ± 1.0 V
E3 34.368 HDB3
E2 8.448 HDB3 ± 2.37 V
E1 2.048 HDB3
DS1 1.544 B8ZS
The bit rates depend on the mapping options fitted.
Table S-5 Specifications of the AUXILIARY signal output [11], electrical
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .balanced
Socket type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Lemo SA
(Bantam)
Output impedance
2.048 Mbit/s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Ω
1.544 Mbit/s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Ω
Max. permitted peak spurious input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . ± 5 V
Specifications S-9
ANT-20/ANT-20E M13 MUX/DEMUX
The balanced output is used as a LINE or as an AUXILIARY output.
3.3 Signal inputs
3.3.1 AUXILIARY signal input [10], electrical
LOS (Loss of Signal) status display
LED lights up if the signal input is active but no signal is present.
Interface Bit rate (Mbit/s) Line code Output voltage
E1 2.048 HDB3 ± 3.0 V
DS1 1.544 B8ZS DSX-1 compatible
The bit rates depend on the mapping options fitted.
Table S-6 Specifications of the LINE/AUXILIARY signal output [13], electrical
Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . unbalanced, (coaxial)
Socket type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BNC
Input impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75 Ω
Max. permitted frequency offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 500 ppm
Input voltage range. . . . . . . . . . . . . . . . . . . . . . . . . . .0 dB attenuation referred to nominal level
Max. permitted peak input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 5 V
Interface Bit rate (Mbit/s) Line code Input voltage
E4 139.264 CMI 1.0 V ±10 %
DS3 44.736 B3ZS 1.0 V ±10 %
E3 34.368 HDB3
E2 8.448 HDB3 2.37 V ±10 %
E1 2.048 HDB3
DS1 1.544 B8ZS
The bit rates depend on the mapping options fitted.
Table S-7 Specifications of the AUXILIARY signal input [10], electrical
S-10 Specifications
M13 MUX/DEMUX ANT-20/ANT-20E
3.3.2 LINE/AUXILIARY signal input [12], electrical
LOS (Loss of Signal) status display
LED lights up if the signal input is active but no signal is present.
The balanced input is used as a LINE or as an AUXILIARY input.
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .balanced
Socket type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Lemo SA
(Bantam)
Input impedance
2.048 Mbit/s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Ω
1.544 Mbit/s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Ω
Max. permitted frequency offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 500 ppm
Max. number of consecutive zeros for line code = AMI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Max. permitted peak input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 5 V
Interface Bit rate (Mbit/s) Line code Input voltage
E1 2.048 HDB3 3.0 V ±10 %
DS1 1.544 B8ZS
The bit rates depend on the mapping options fitted.
Table S-8 Specifications of the LINE/AUXILIARY signal input [12], electrical
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