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Summary of Contents for Megger BERT-20E1
- Page 1 BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 1 BERT-20E1 2.048 Mbps Network Analyzer USER MANUAL...
- Page 2 The network and user terminals may be raised to hazardous voltages if this unit is connected to non SELV circuits. This instrument should not be used if there are any visible signs of damage to the case or terminal area. In such cases, the instrument should be returned to a Megger authorised repair and service centre. NOTE...
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Page 3: Table Of Contents
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 3 CONTENTS GETTING STARTED TS/Channel Frequency & Level Software Revision RX Level Measurements Supplied Equipment RX Frequency/Clock Slips Handling Precautions PERF – PERFORMANCE RESULTS Front Panel Features Unavailable Seconds/Available Seconds Test Modes Degraded Minutes/Degraded Minutes Percent Frame Structures Severely Error Seconds/Severely Error Seconds Percent Test Patterns... - Page 4 05/05/2004 8:24 am Page 4 Overview The BERT-20E1 test set delivers a powerful hand-held solution for Frequency and amplitude measurements testing 2.048 Mbps E1 and 64 kbps digital circuits. It combines extensive Displays signaling bits and TS data bits BER test functions along with signal quality measurements structured Monitor voice with internal speaker behind an intuitive user interface.
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Page 5: Getting Started
This section is intended to give first-time users a quick overview of the Cleaning Guidelines: To clean the surface of your BERT-20E1, lightly main features of BERT-20E1. Much of the information is repeated later in wipe with a soft cloth that is coated with isopropyl alcohol, ethyl this manual, but in greater detail. -
Page 6: Front Panel Features
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 6 FRONT PANEL FEATURES TX - 75 Ω RX - 75 Ω TX output/RX input 120 Ω PRINTER (and data) output EXT CLOCK IN input DISPLAYED RESULTS SCROLL keys DISPLAYED RESULTS FORMAT selector AUXILLARY MENU FUNCTION SELECTION keys Print on demand LINE TERMINATION selector... -
Page 7: Test Modes
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 7 Frame Structures Test Modes NONE No Framing NORM E1 Norm mode No multiframing AUTO Automatic detection mode P31C CRC multiframing Fx56 Fractional E1 (Nx56) mode No TS-16 multiframing Fx64 Fractional E1 (Nx64) mode TS-16 multiframing No CRC multiframing Half duplex drop and insert mode P30C... -
Page 8: Test Patterns
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 8 Test Patterns Line Codes USER1 User defined test Alternate mark inversion Pattern up to 64 bits. HDB3 High density bipolar 3 USER2 User defined test Pattern up to 64 bits. as per ITU-T O.151, O.152, O.153. -
Page 9: Auxiliary Functions
The BERT-20E1 is primarily powered by five, rechargeable, nickel metal hydride (NiMH) batteries. An auxiliary power connector (which is provided with the BERT-20E1) is available for use with an AC/DC power adapter. The ON/OFF switch is located on the front panel of the BERT- 20E1. -
Page 10: Connecting To The Network
05/05/2004 8:24 am Page 10 CONNECTING TO THE NETWORK BERT-20E1 provides 75 Ω unbalanced and 120 Ω balanced transmit and The receiver interface termination can be: receive interfaces located at the top of the instrument. 75 Ω RECEIVE Receiver input interface. Allows the connection of 75 Ω... -
Page 11: Connecting To A Protected Monitor Point
05/05/2004 8:24 am Page 11 The BERT-20E1 also provides a 75 Ω EXT CLOCK IN port which accepts Connecting to a Protected Monitor Port a 2 MHz clock source complying with ITU-T G.703 Section 10 When conducting out-of-service testing, choose TERM (terminated) (Reference 1). -
Page 12: Selecting Operating Modes
8:24 am Page 12 SELECTING OPERATING MODES The BERT-20E1 offers ten operating modes. Modes of operation are Fx64 – Fractional E1 (Nx64) Mode selected by using the up/down arrow keys located under the MODE This mode allows the user to test in a fractional E1 environment. The section of the instrument’s upper panel. -
Page 13: Llb - Local Loop Back
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 13 LLB – Local Loop Back by transmitting the data signal and associated timing signal from the terminal equipment to the multiplexer. The LLB mode loops back the currently received data stream. This mode is often referred to as a THROUGH mode. Individual channels may be The term co-directional is used to describe an interface across which the dropped to the speaker and errors may be inserted into the out-going information and its associated timing signal are transmitted the same... -
Page 14: Viewing Test Results
Bit Errors & Bit Error Rate CRC Errors/CRC Error Rate The BERT-20E1 must be synchronized with a test pattern before it can If the BERT-20E1 establishes frame synchronization with a PCM30C or detect and record a bit error. Therefore, bit errors are registered only if a PCM31C framed signal, it will detect and record cyclic redundancy BERT pattern is present. -
Page 15: Error Free Seconds & Percent Error Free Seconds
The % Error Free Seconds parameter is a good measure of performance 75 Ω or 120 Ω Rx jack, the BERT-20E1 compares the two inputs and and quality for the circuit under test. It is a measure of the Error declares clock slips (if they are out of phase). -
Page 16: Degraded Minutes/Degraded Minutes Percent
FRAME SYNC framing LED, under the RX STATUS section, illuminates. The error seconds parameter is a one second interval of an available For further analysis, the BERT-20E1 provides the ability to view the state second where one or more bit errors have occurred. -
Page 17: Auxiliary Menu Functions
05 Time of Day The TEST LENGTH menu can only be accessed when operating in the The BERT-20E1 has an on-board real time TOD clock. The TOD clock AUTO, F x 56, F x 64, LLB or TLB modes of operation. -
Page 18: Printing Results
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 18 PRINTING RESULTS In order to keep the Printer interface as simple as possible. The baud ** TEST RESULTS ** G.821 RESULTS rate, character size, parity and stop bits have been hard coded. The ErrSecs TIME: <CURRNET TIME>... -
Page 19: Product Specifications
BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 19 SPECIFICATIONS Physical Auxiliary Power: Size: 43 mm x 127 mm x 229 mm DC power jack (accepts 2.5 mm diameter female plug with center or tip "+" and outside "-") (1.75 H x 5 W x 9 inches D) Receiver Weight: 0.6 Kg (1.32 lbs.) - Page 20 BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 20 Line Coding: AMI, HDB3 CRC4 Level - 915 or more CRC4 code words out of 1000 received in error Test Patterns: PRBS: 2 -1, 2 -1, 2 -1, 2 -1, 2 -1, 2 CAS Level - Two consecutive MF alignment words received in Word: Two user defined 64-bit word, all ONES, all error...
- Page 21 BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 21 Signal: E1 FREQ; E1 LEVEL (p-p) Test Patterns: PRBS: 2 -1, 2 -1, 2 -1, 2 -1, 2 -1, 2 -1 as per ITU-O.151, O.152, O.153 TS/channel freq.; TS/channel level Word: Two user defined 64-bit word, all ONES, all DTMF Capture Buffer: 16 digits ZEROS, 1:1...
- Page 22 A number of independent instrument repair companies have been has been impaired it should not be used, and be sent for repair by approved for repair work on most Megger equipment, using genuine suitably trained and qualified personnel. The protection likely to be Megger spare parts.
- Page 23 BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 23...
- Page 24 OTHER TECHNICAL SALES OFFICES Toronto CANADA, Sydney AUSTRALIA, Mumbai INDIA, Madrid SPAIN and the Kingdom of BAHRAIN. Megger products are distributed in 146 countries worldwide. This instrument is manufactured in the United Kingdom. The company reserves the right to change the specification or design without prior notice.
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