Megger BERT-20E1 Manual de usuario

BERT-20E1

2.048 Mbps Network Analyzer

USER MANUAL

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 1

GSAFETY WARNINGS

■Safety isolation to permit connections to signal lines carrying hazardous voltages (including TNV-1, TNV-2 and TNV-3) is not provided. NEVER

connect the BERT 20E1 to such lines.

■This product is intended only for connection to circuits carrying SELV voltages in an indoor environment and where appropriate surge and transient

protection has been fitted. 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

THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 2

TS/Channel Frequency & Level

RX Level Measurements

RX Frequency/Clock Slips

PERF – PERFORMANCE RESULTS 15

Unavailable Seconds/Available Seconds

Degraded Minutes/Degraded Minutes Percent

Severely Error Seconds/Severely Error Seconds Percent

Error Seconds/Error Free Seconds

RX Status LEDs

TS/Channel Data Bits & Signaling Bits

AUXILIARY MENU FUNCTIONS 17

00 Monitor Jack Gain

01 Test Length

02 Error Inject Rates

03 User Pattern [1]

04 User Pattern [2]

05 Time of Day

06 Day and Date

PRINTING RESULTS 18

Printouts

PRODUCT SPECIFICATIONS 19

Symbols used on the instrument are:

FCaution: risk of electric shock

GCaution: refer to accompanying notes

cEquipment complies with current EU directives.

CONTENTS

GETTING STARTED 5

Software Revision

Supplied Equipment

Handling Precautions

Front Panel Features

Test Modes

Frame Structures

Test Patterns

Line Codes

Auxiliary Functions

Power

Batteries

CONNECTING TO THE NETWORK 10

Connecting to a Protected Monitor Point

Connecting to a Unprotected Monitor Point

SELECTING OPERATING MODES 12

NORM –Normal Mode

AUTO – Automatic Detection Mode

Fx56 – Fractional E1 (Nx56) Mode

Fx64 – Fractional E1 (Nx64) Mode

D/I – Half Duplex Drop and Insert

TONE – Tone Insertion Mode

LLB – Local Loop Back

TLB – Test Loop Back

DLAY – Round Trip Loop Delay Measurement Mode

CO64 – Co-directional Interface 64 kbps

VIEWING TEST RESULTS 14

NORM – Normal List of BER and Non-BER Results

CRC Errors/CRC Error Rate

FAS Bit Errors/E Bit Errors

Bipolar Violation Errors & BPV Rate

Bit Errors & Bit Error Rate

Error Free Seconds & Percent Error Free Seconds

Error Seconds & Severely Error Seconds

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 3

■Frequency and amplitude measurements

■Displays signaling bits and TS data bits

■Monitor voice with internal speaker

■Single channel DTMF digit decode

■Measure clock synchronization problems (bit slips)

■Round trip loop delay measurement

■Performance analysis to ITU-T G.821

Overview

The BERT-20E1 test set delivers a powerful hand-held solution for

testing 2.048 Mbps E1 and 64 kbps digital circuits. It combines extensive

BER test functions along with signal quality measurements structured

behind an intuitive user interface. This combination of test capability and

user-friendly ergonomics simplifies installation and maintenance testing,

thus offering faster circuit turn-up and problem resolution. The BERT-

20E1 also provides more than 8 hours measurement operation from a

single charge, making it ideal for one-shift testing particularly in

environments where a convenient power supply may not be available.

Measurement Summary

The BERT-20E1 combines BER test functions along with signal

qualitymeasurement providing the ability to evaluate and troubleshoot 2

Mbps, n x 64 kbps and 64 kbps co-directional circuits.

■Transmits both PRBS and Word test patterns. PRBS: 27-1, 29-1, 211-1,

215-1, 220-1, 223-1 as per ITU-T O.151, O.152, O.153. Word: two 64-bit

user defined patterns, all-ones, all-zeros, 1:1.

■Fractional (Nx56 and Nx64 kbps) BER testing.

■Full 2.048 Mbps BER testing.

■Logic error insert – single and user selectable rate

■BPV error insert – single and user selectable rate

■FAS error insert – single and user selectable rate

■CRC4 error insert – single and user selectable rate

■Single channel insert for BER patterns and analog test tones

■LLB mode – line loop-back mode with error analysis

■TLB mode – test loop-back mode with error analysis

■Displays standard alarm conditions with history LEDs

■Displays major performance parameters

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 4

Cleaning Guidelines: To clean the surface of your BERT-20E1, lightly

wipe with a soft cloth that is coated with isopropyl alcohol, ethyl

alcohol, or thichloroethylene solvent. Do not use water, ketone, or

aromatics.

Environmental Conditions: Do not exceed the operating temperature

limits of -20°C to +50°C, -4°F to +122°F (as specified in the technical

specifications section of this manual). Do not store or operate your

BERT-20E1 where it will be exposed to direct sunlight, high

temperatures, or high humidity for extended periods of time.

GETTING STARTED

This section is intended to give first-time users a quick overview of the

main features of BERT-20E1. Much of the information is repeated later in

this manual, but in greater detail.

Software Revision

The software and hardware of the BERT-20E1 is displayed in the

opening screen when the unit is initially powered-up.

Supplied Equipment

The BERT-20E1 is supplied with the following items.

■A/C power adapter

■User manual including CD-ROM based E1 basics

■Carrying case

■Rubber boot

Handling Precautions

Shipping and Packaging: The BERT-20E1 is carefully packaged to

prevent damage to the test set during shipment. When you receive your

BERT-20E1, carefully observe the shipping container before the carrier

departs. If the container is damaged, present it to the carrier at this time.

After unpacking your test set, examine it to ensure that it is free of any

visible signs of damage. If the BERT-20E1 was damaged during

shipment, immediately file a claim with the carrier.

Service and Adjustment: The BERT-20E1 contains no user-serviceable

parts. Service or adjustment should only be made by Megger personnel

to ensure that the safety features of the test set are not affected. If you

are experiencing difficulties with your test set, contact Megger at

www.megger.com.

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 5

FRONT PANEL FEATURES

PRINTER (and data) output

RX - 75 Ω

TX - 75 Ω

TX output/RX

input 120 Ω

EXT CLOCK IN input

DISPLAYED RESULTS

FORMAT selector

LINE TERMINATION

selector

DISPLAY CONTAST

controls

TS/CHANNEL DATA and

SIGNALLING bits

DISPLAYED RESULTS SCROLL keys

Print on demand

SPEAKER VOLUME controls

BATTERY STAUS indicator

TS/CHANNEL SELECTION keys and

display

Stores test configuration

Recalls test configuration

Selects circuit termination

Injects LOGIC, BPV or FRAME/CRC

errors

Power ON/OFF

d.c input

AUXILLARY MENU FUNCTION SELECTION keys

RECEIVER STATUS

indicators

Clears RECEIVER STATUS

history

Clears errors and RX Status

and restarts tests

Selects transmitter setup

Selects transmitter clock

source

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 6

Frame Structures

Test Modes

NORM E1 Norm mode

AUTO Automatic detection mode

Fx56 Fractional E1 (Nx56) mode

Fx64 Fractional E1 (Nx64) mode

D/I Half duplex drop and insert mode

TONE Tone insert mode

LLB Local loop back mode

TLB Test loop back mode

DLAY Round trip loop delay

measurement

CO64 Co-directional 64kbps mode

NONE No Framing

P31 No multiframing

P31C CRC multiframing

No TS-16 multiframing

P30 TS-16 multiframing

No CRC multiframing

P30C TS-16 multiframing and CRC

multiframing

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 7

Line CodesTest Patterns

USER1 User defined test

Pattern up to 64 bits.

USER2 User defined test

Pattern up to 64 bits.

27-1 as per ITU-T O.151,

O.152, O.153.

29-1 as per ITU-T O.151,

O.152, O.153.

211-1 as per ITU-T O.151,

O.152, O.153.

215-1 as per ITU-T O.151,

O.152, O.153.

220-1 as per ITU-T O.151,

O.152, O.153.

223-1 as per ITU-T O.151,

O.152, O.153.

1:1 Alternating ones and zeros

pattern

ZEROS All zeros pattern

ONES All ones pattern

AMI Alternate mark inversion

HDB3 High density bipolar 3

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 8

Auxiliary Functions Power

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. Battery status is monitored and displayed with the BATTERY

STATUS indicator, located on the front panel.

Batteries

The BERT-20E1 contains five, 1.2V, 4Ahr. NiMH, rechargeable batteries.

These batteries will provide approximately eight hours of continuous

operation (when fully charged). The charging voltage is 9 VDC and the

rated current is 1.4 A. A regulated 9 VDC, 1.5 A power adapter may be

used for charging. Recharge time is typically 4-6 hours depending on

how deeply the batteries have been discharged.

The BERT-20E1 batteries are not serviceable. To recharge the batteries,

connect the 9 VDC power source to the DC jack located on the front

panel. The test set will charge during operation, but it is recommended

that the unit is turned off when not in use to fully charge the unit. To

determine the charging status, observe the red and green LEDs located

on the lower front panel of the BERT-20E1. The red LED illuminates

when the battery is in the charging state. The green LED illuminates

when the battery is in maintenance charge. If both LEDs are off, the

batteries are either absent from the test set or do not fall within the

proper temperature range to charge the batteries. If both LEDs are

illuminated, the battery is not properly charging and you must return the

BERT-20E1 to Megger for repair.

00 MONITOR JACK GAIN (None,

12dB, 30dB)

01 TEST LENGTH

02 ERROR INJECT RATES

03 USER PATTERN [1]

04 USER PATTERN [2]

05 TIME OF DAY SETTING

06 DAY AND DATE SETTING

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 9

The receiver interface termination can be:

BERT-20E1 provides 75 Ωunbalanced and 120 Ωbalanced transmit and

receive interfaces located at the top of the instrument.

75 ΩRECEIVE Receiver input interface. Allows the connection of

75 Ωunbalanced data signals.

75 ΩTRANSMIT Transmitter output interface. Provides 75 Ω

unbalanced data output.

120 ΩRECEIVE Receiver input interface. Allows the connection of

120 Ωbalanced data signals.

120 ΩTRANSMIT Transmitter output interface. Provides 120 Ω

balanced data output.

EXT CLOCK IN Allows connection of a 75 Ωtiming reference as per

ITU-T G.811. The reference format may be either

clock or another E1 data data source

CONNECTING TO THE NETWORK

Terminated 0dB Gain.

Monitor 0dB Gain.

Monitor 12dB Gain – to

compensate for a low

level signal at

a network equipment

monitor point.

Monitor 30dB Gain – to

compensate for a low

level signal at

a network equipment

monitor point.

Bridged High impedance.

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 10

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