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CRC4 Level -

915 or more CRC4 code words out of 1000 received
in error

CAS Level -

Two consecutive MF alignment words received in
error

Alarm Indication Signal (AIS):

Unframed ALL ONES, more than (2) zero’s in (2)
frames (512 bits)

FAS Remote Alarm (RRA):

Bit 3 of non-align frame set to zero for (3)
consecutive occasions

MAS Remote Alarm (RDMA):

Bit 6 in time slot 16 set to zero for (2) consecutive
multiframes

Timeslot Data Drop:

Selected time slot to 8 data-bit LEDs and speaker

Signaling Types:

CCS and CAS

Digit Capture:

DTMF

CAS Signaling Bits:

A, B, C, D to (4) discrete LEDs

EXT CLOCK IN

Input Impedance:

Ω

±5%

Range:

0 to –43 dB

Compatibility:

ITU-T G.703, G.704, G.706, G.823, G.732, and I.431

ETS 300 011, 300 233, and 300 166 CTR12 and
CTR4.

Transmitter

Line Code:

AMI or HDB3

Framing:

NONE, PCM30, PCM30C, PCM31 and PCM31C

Frequency:

2048000 Hz ± 2.5 ppm

Line Coding:

AMI, HDB3

Test Patterns:

PRBS: 2

-1, 2

-1

Word:

Two user defined 64-bit word, all ONES, all

ZEROS, 1:1

Status/History:

■

TEST SUMMARY

■

AMI

■

HDB3

■

FAS SYNC

■

OCTET SYNC

■

MAS SYNC

■

PATTERN SYNC

■

SIGNAL PRESENT

■

OUT OF FRAME

■

PATTERN SYNC LOSS

■

AIS

■

FAS REMOTE ALARM

■

MAS REMOTE ALARM

■

CRC-4 DETECT

Pattern Sync Loss:

100 bit errors in 1000 bits

Pattern Sync Gain:

0 bit errors in N + 1200 bits, N = 20 for 2^15-1, N =
pattern length for the other pattern

Signal Present:

Absent when 255 consecutive zeros (no pulses)
have been detected

Out of Frame:

FAS level - (3) consecutive incorrect FAS frames
received

BERT_20E1_6172-871_UG_V02 05/05/2004 8:24 am Page 20

Содержание BERT-20E1

Страница 1: ...M BERT 20E1 2 048 Mbps Network Analyzer USER MANUAL BERT_20E1_6172 871_UG_V02 05 05 2004 8 24 am Page 1...

Страница 2: ...propriate 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...

Страница 3: ...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 C...

Страница 4: ...cularly 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...

Страница 5: ...en 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 Handl...

Страница 6: ...LUME 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...

Страница 7: ...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 multifr...

Страница 8: ...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 ze...

Страница 9: ...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 recommen...

Страница 10: ...ction of 120 balanced data signals 120 TRANSMIT Transmitter output interface Provides 120 balanced data output EXT CLOCK IN Allows connection of a 75 timing reference as per ITU T G 811 The reference...

Страница 11: ...nuation Typically this gives a test signal 30 26 20dB down on the traffic signal Select MON monitor as your receive interface termination Next choose the appropriate MONITOR GAIN from the BERT 20E1 s...

Страница 12: ...4 Mode This mode allows the user to test in a fractional E1 environment The full 8 bits of data are available in each time slot The receiver and transmitter are manually configured for frame pattern a...

Страница 13: ...ing the logic error inject key the test set will insert a single logic error into the E1 payload At the same time a 1 millisecond counter is started and the receiver will start looking for the bit err...

Страница 14: ...E1 has achieved pattern synchronization by observing the green PATTERN SYNC LED under the RX STATUS heading on the front panel of the unit Each time the test set detects an error in the logic bit stre...

Страница 15: ...ed will be measured and the received level or amplitude will be displayed The BERT 20E1 demodulates the digitally encoded signal on the selected channel and drops the channel to the speaker The level...

Страница 16: ...rror seconds parameter is a one second interval of an available second where one or more bit errors have occurred The error free seconds parameter is a one second interval of an available second where...

Страница 17: ...to OFF The ERROR INJECT RATE menu can only be accessed when operating in the NORM AUTO F x 56 F x 64 D I LLB or TLB modes 03 User Pattern 1 The user pattern 1 is a user defined patterns that is 32 bi...

Страница 18: ...l Fx56 Fx64 LLB or TLB and the printer is correctly hooked up and configured correctly The following sample printout will be observed TEST RESULTS TIME CURRNET TIME DATE CURRENT DATE MODE NORM FRAME P...

Страница 19: ...ular DIN Custom EXT CLOCK IN 75 BNC Auxiliary Power DC power jack accepts 2 5 mm diameter female plug with center or tip and outside Receiver Modes NORM Tx follows Rx AUTO Auto Configure Rx Tx is inde...

Страница 20: ...G 706 G 823 G 732 and I 431 ETS 300 011 300 233 and 300 166 CTR12 and CTR4 Transmitter Line Code AMI or HDB3 Framing NONE PCM30 PCM30C PCM31 and PCM31C Frequency 2048000 Hz 2 5 ppm Line Coding AMI HDB...

Страница 21: ...ORM SUMMARY PERFORMANCE Clock Slips A positive number indicates that the reference clock is faster a negative number indicates that the reference clock is slower Errors Logic rrrors logic error rate B...

Страница 22: ...rsonnel The test set circuit contains static sensitive devices and care must be taken in handling the printed circuit board If the protection of a test set has been impaired it should not be used and...

Страница 23: ...23 BERT_20E1_6172 871_UG_V02 05 05 2004 8 24 am Page 23...

Страница 24: ...30 16 08 90 F 33 0 1 34 61 23 77 OTHER TECHNICAL SALES OFFICES Toronto CANADA Sydney AUSTRALIA Mumbai INDIA Madrid SPAIN and the Kingdom of BAHRAIN Megger products are distributed in 146 countries wo...

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