GAOTek Data Transmission Analyzer and E1/T1 BER Tester


This Data Transmission Analyzer with E1/T1 BER Tester is a handheld communications test set which can be used for E1 digital circuit, DDN and error bit test for data communication system with the transport fiber

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GAOTek handheld and battery-operated Data Transmission Analyzer and E1/T1 BER Tester is a communication test set which can be used for E1 digital circuit, DDN and error bit test for data communication system with the transport fiber. This data transmission analyzer is designed for frame synchronization code monitoring, CRC monitoring, offline error testing, signal waveform analysis, IP PING testing, offline and online monitoring and ITU-T G.703 error analysis. This tester has testing functions for G.703, V.24/RS-232, V.35, V.36/RS-449, X.21, EIA-530 A/530 A, end-to-end testing, voice and frequency measurement, remote loopback testing, E1 pulse mask, and PING testing. It also supports RJ45 network interface and complete TCP/IP.

Key Features

  • Simultaneous monitoring of dual-E1 or T1 circuit
  • Opening and maintenance of 2M circuit
  • Frame word, Signaling and time slot data viewing
  • Color TFT LCD
  • Various errors insertion and detection, such as bit, Code, FAS, CRC
  • Use PC to perform the remote control of the test set through Ethernet
  • Large capacity Li-ion battery guarantees 8 hours continuous operation
  • Large data storage, 5000 records

Technical Specifications

Testing Interface Index  
Internal Clock 2048 KHz±5 PPM
Signal Code HDB3/AMI/B8ZS
Signal Interface ITU-T G.703
Test Pattern PRBS 2n-1 (n=6,9,11,15,20,23)
Tx BNC 75Ω Unbalanced, RJ48

120 Ω Balanced

Rx BNC 75Ω Unbalanced

High impedance > 2k Ω,

RJ-48 120 Ω Balanced

High impedance > 2 kΩ

General specifications
Interface RJ-45, DC Power
Data Storage More than 5000 records
Operation Mode Keyboard
Operation Time 8 hours
Display 4” TFT LCD, 320 x 240
Weight 3.3 lbs. (1.5 kg)
Dimension 7.48 in x 4.25 in x 1.97 in (190 mm x 108 mm x 50 mm)
Humidity 5 % to 95 %
Operating Temperature 14 ˚F to 122 ˚F (-10 ˚C to + 50 ˚C)
Storage Temperature -40 ˚F to 158 ˚F (-40 ˚C to + 70 ˚C)

Configuration Options

Power Supply

GAOTek Data Transmission Analyzer and E1/T1 BER Tester supports two power supply modes, DC and battery, with a built-in large capacity rechargeable lithium battery for 8-hour long consecutive operation after being fully charged.

When using external power supply, the battery will charge automatically with the battery capacity shown on the right top corner of LCD at any moment. When using AC power, please use the AC charger accompanied, or the instrument will be damaged.


In order to guarantee a reliable test result, we suggest you to have a self-test according to the following steps each time before switching on for testing.

Step Operation Description
1 Power On One slight click of “Pwr” key with Beep tone and after 10 odd seconds, enters the main menu.
2 Check Battery Capacity If Battery Capacity shown on the first row of LCD indicates insufficiency, in this case you should use the AC Charger accompanied with the instrument to supply electricity.
3 Initialization Self-Check In the main menu, enter the “System” menu, select “Self-Test” and after 10 odd seconds, self-Test result is displayed on LCD, with “OK!” as having been passed.

Operation Keys


All tests can be done according to the key-operation on the screen. All of the abbreviations used are listed as following for your reference.

Acronym Meaning
LOS Loss of signal
AIS Alarm indication signal
LOF Loss of frame
LOMF Loss of Multi-frame
LOP Loss of Pattern
RDI Remote defect Indication
FAS Frame Alignment Signal
CAS Channel associated signaling
CRC Cyclic Redundancy Check
EB Error Block
BBE Background Block Error
PRBS Pseudo Random Bit Sequence
TSE Time Slot Error Bit
ES Error Second
SES Severely Error Second
EFS Error Free Seconds
UAS Unavailable Second
DTE Data Terminal Equipment
DCE Data Communication Equipment

Interface Description

The above picture is the left interface diagram, in which BNC interfaces on both sides are G.703 E1 unbalanced interfaces with the impedance as 75Ω, L1-RX representing input of L1 and L1-TX representing output of L1; the middle interface is G.703 E1 balanced interface with the impedance as 120Ω(E1/G.703 64K) or 100Ω(T1) including input & output

The right interface, in which BNC interfaces on both sides are G.703 E1 unbalanced interfaces with the impedance as 75Ω, L2-RX representing input of L2 and L2-TX representing output of L2 the middle interface is a 10M/100M RJ45 network interface

The below diagram is the top interface diagram


G.703 E1 testing

  • Dual E1 in-service monitoring
  • Alarm generation and error insertion
  • E1 pulse mask
  • Voice and frequency measurement
  • Slip code testing
  • Performance analysis according to ITU-T recommendation

G.703 64K testing

  • 64K out of service testing
  • Alarm generation and error insertion
  • Performance analysis according to ITU-T recommendation

G.703 T1 test

  • Alarm Event
  • Error BIT Count/Rate
  • RX-CLK/Frequency Test
  • 821 (BIT) Test
  • 826 (CRC) Test
  • 826 (OOF) Test
  • M2100 (CRC) Test
  • M2101 (CRC) Test
  • Error Injection Test
  • Alarm Injection Test
  • Delay Measurement
  • APS Measurement

V series interfaces testing

  • 24/RS-232, V.35, V.36/RS-449, EIA-530/530 A, X.21 interface BER testing
  • Performance analysis according to ITU-T recommendation

PING testing

  • IP address setting
  • Ethernet connectivity testing

Typical Applications

  • 2M Circuit Opening- Off-line loopback testing
  • 2M Circuit Opening- offline end-to-end testing
  • Network Maintenance- 2M online testing
  • Network maintenance- 2M pass through test
  • Circuit opening- 64K offline loopback testing
  • Circuit- 64K offline end-to-end testing
  • Network maintenance—V series interfaces testing
  • Circuit opening–T1offline end-to-end testing
  • Circuit–T1 offline loopback testing
  • Signal quality testing—E1/T1 pulse template
  • Test occupied channel—Voice Monitoring
  • Test equipment A/D transfer ability—Audio Testing
  • Verify Ethernet Connectivity—Ping testing

Data Management System

 Through RJ-45 Network Interface, operation and data exchange can be available in the Data Management System.


Data Management System can achieve all functions between Computer and BER communication.

Through Data Management System software, computer can extract all test data in the memorizer, and saved in the Hard Discs of computer. Standard interface for database is available, which help manage data.

It can emulate manual operation in the platform, control this instrument, and carry on all operation through Mouse.

Work Environment

A necessary Configuration is as follows,

CPU Pentium III 733 or above, IBM PC or compatible computer
Memory 256 M or larger
Hard Discs Residual storage: more than 100 M
Screen At least 800 × 600 16 colors or more
DVD Drive 16x or above
Network Interface At least one network interface
System Windows 2000/XP


Through RJ-45 network interface, Data Transmission Analyzer and E1/T1 BER Tester connects PC directly.

 Record Operation

When  data  comes  in  memorizer,  you  can  click  “Read  Records”  to operate. The extracted records will display in the bars, to save it by click, or you can click “Exit” to exit the system.

EXCEL and TXT format are available for the storage.

Summary of Faults

Faults Cause Methods
Fail to switch on Battery   electricity exhausted Connect  the  external power  to charge  the battery for several minutes prior to startup
Abnormal  Keystroke Function Shift key clicked Click Shift key
In   the   PCM30   of in-service monitoring,      “LOF” alarm bright System  set  as PCM31 Set   the   test   system   as PCM31 for the tester


LOS  alarm      light bright No Input signal Check the input cable
Alarm  or     error existing always The instrument is in the state of error or alarm insertion. Cancel the status of error or alarm insertion.
Errors appear all the time in      the in-service Monitoring. Test  mode selected as BER Mode


Select   the   test   mode   as “Live” mode in “Config”.
When connected with network cable, Ping is not OK. Not used cross-over network cable.     Not set     IP Address correctly  

Use the cross-over network cable allocated by the factory

Set IP Address correctly

There are faults with unknown    causes Possibly caused by the confusion of settings. Switch off once and switch on again.


Additional information

Weight 2.64 kg

E1 standard configuration, E1 full configuration, Full configuration

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