GAOTek Pocket Size Handheld ADSL2+ Tester

This multi-functional handheld ADSL2+ tester is specially designed for ADSL, ADSL2, ADSL2+, READSL and VDSL2 testing and can be used for installation and maintenance



GAOTek handheld ADSL2+ tester is a multi-functional tester specially designed for ADSL, ADSL2, ADSL2+, READSL and VDSL2 testing. Besides providing xDSL and dial testing, the tester also functions as a digital multi-meter (DMM). The tester also provides modem emulation, telephone call functions and line voltage indication. It is an ideal tool for ADSL/ADSL2+ network installation, maintenance and fault elimination. The tester adopts LCD display and menu operation which can display the test results directly and improve the xDSL broadband service. This instrument is used for the field operators of installation and maintenance.

Key Features

  • Fast copper tests with DMM (AC V, DC V, Loop and Insulation Resistance, Capacitance)
  • Modem emulation and simulation of login to Internet
  • ISP login (username/password) and IP Ping tests (WAN PING Test, LAN PING Test)
  • Multi-protocol, PPPoE/PPPoA (LLC or VC-MUX)
  • Audio and LED alarm indications (Lower Power, PPP, LAN, ADSL)
  • Rechargeable Li-ion Battery
  • 50 record data memory capacity
  • LCD display, menu operation
  • Auto shut off function
  • Compliant with all known DSLAMs
  • Software management


Technical Specifications

Standards ITU G.992.1 (G.dmt),

ITU G.992.2 (G.lite),

ITU G.994.1 (G.hs),

ANSI T1.413 issue #2,

ITU G.992.5(ADSL2+ )

Up Channel Rate 0 ~ 1.2 Mbps
Down Channel Rate 0 ~ 24 Mbps
Up/Down Attenuation 0 ~ 63.5 dB
Up/Down Noise Margin 0 ~ 32 dB
Error Test CRC, FEC, HEC, NCD, LOS
Up Channel Rate 0 ~ 1 Mbps
Down Channel Rate 0 ~ 8 Mbps
Up/Down Attenuation 0 ~ 63.5 dB
Up/Down Noise Margin 0 ~ 32 dB
Error Test CRC, FEC, HEC, NCD, LOS
DMM Test
DC Voltage 0 ~ 400 V
AC Voltage 0 ~ 400 V
Loop Resistance 0 ~ 20000Ω
Capacitance 0 ~ 1000 nF
Insulation Resistance 0 ~ 50 MΩ
General Specification
Power Supply 2800 mAH Li-ion battery (internal rechargeable)
Battery Duration 4 to 5 hours
Dimension 7.09 in x 3.66 in x 1.9 in

(180 mm x  93 mm x  48 mm)

Humidity 5 % to 90 %
Weight 1.10lbs. (<0.5 kg)
Operating Temperature 32 ˚F to 104 ˚F (0 ˚C to + 40 ˚C)



Ordering Information:

Item Quantity
xDSL Tester 1pcs
Charger 1pcs
Cross Network Cable 1pcs
Direct Network Cable 1pcs
Test Cord 1pcs
Data Cable 1pcs
User Manual 1pcs
Carry Case 1pcs
CD (management Software)                         1pcs

Main Function

xDSL specifications


  1. Standards: ITU G.992.1 (G.dmt), ITU G.992.2 (G.lite), ITU G.992.3 (ADSL),ITU G.994.1 (G.hs), ANSI T1.413 issue #2, ITU G.992.5 (ADSL2+) Annex L, Annex M. working mode set to be full-automatic mode.
  2. Maximal connecting distance is 4.04 mi (6.5 km); Compatible with ADSL, ADSL2 and READSL
  3. DSL transmission parameters:
  • DSL up/down max speed
  • DSL up channel speed: 0 ~ 2.5 Mbps
  • DSL down channel speed: 0 ~ 24 Mbps
  • DSL up/down attenuation: 0 ~ 63.5 dB
  • DSL up/down noise margin: 0 ~ 32 dB
  • DSL up/down output power: 0~25 dBm
  • Error test for LCD, OCD, HEC
  • Test INP (Impulse Noise Protection) 0-8
  • Test interlaced code: Delay, Depth
  • Display good DSL connection mode
  • Judge service quality, 4 grades; Excellent, Good, OK, Poor
  • Display the channel bit chart
  • Channel mode support fast channel and interlaced channel

ADSL module

  1. Standards: ITU G.992.1 (G.dmt), ITU G.992.2 (G.lite), ITU G.994.1 (G.hs), ANSI T1.413 Issue # 2
  2. DSL transmission parameters:
  • DSL up/down max speed
  • DSL up channel speed: 0 ~ 1 Mbps
  • DSL down channel speed: 0 ~ 8 Mbps
  • DSL up/down attenuation: 0 ~ 63.5 dB
  • DSL up/down noise margin: 0 ~ 32 dB
  • DSL up/down output power: 0~25 dBm
  • Error test for LCD, OCD, HEC, FEC, CRC
  • Test INP (Impulse Noise Protection) 0-8
  • Test interlaced code: Delay
  • Display good DSL connection mode
  • Judge service quality, 4 grades: Excellent, Good, OK, Poor
  • Display the channel bit chart
  • Channel mode support fast channel and interlaced channel.

VDSL2 module

  1. Standard: ITU G.993.2 (VDSL2). Be compatible with ADSL2+, ADSL standard.
  2. DSL line transmission parameter
  • DSL line attenuation
  • DSL line noise margin
  • DSL line up channel speed (Inter/Fast mode)
  • DSL line down channel speed (Inter/Fast rate)
  • DSL line up/down maximum rate and capacity ratio
  • DMT sub channel bit number: 0~15, and each sub channel frequency points
  • DSL line error number (CRC, HEC, FEC, LCD, OCD)
  • DSL line local output power
  • State display: signal loss, connection close.
  • DSLAM information
  • Error Code Second
  • Impulse Noise Protection (INP)
  • SNR Chart
  1. Support the first 7 profiles in total 8 VDSL2 profiles: profile 8a, 8b, 8c, 8d, 12a, 12b, 17a, 30a

Dialing test functions

After successful dialing, it could get this terminal IP, opposite terminal IP, chiefly DNS server IP and subordinate IP address. The dial function includes PPPoE, PPPoA and Bridge, the PPPoE.

Modem parameters setting

Operator can set current modem standard and choose other mode or Annex M mode. What is more, the operators can also revise PPPoE attribute (VPI/VCI), encapsulation, user name and password by management software or by buttons on the tester.

 Modem emulation

This tester can replace the user Modem completely. And the user could take this tester as modem to dial and login to Internet to test if there is any problem of subscriber’s Modem.

Data storage and browse

This tester has memory capacity of 50 records. The records include line parameters, channel bit chart and error test. User could browse the records on the screen through entering different record number.

 DMM test

This tester can test such items as follows:

  • AC Voltage: -400 V to 400 V; Resolution: 0.1 V
  • DC Voltage: 0 V to 290 V;
  • Capacitance: 0 to 1000 nF
  • Accuracy: 0―10 nF ±2 nF, 10 nF-100 0Nf, ±2 % ± 2nF
  • Loop Resistance: 0 to 20KΩ;
  • Accuracy: 0-100: ±3 % ±4Ω, 100—500: ±3 %, 500—20 KΩ: ± 2%
  • Insulation Resistance: 0 to 50 MΩ;
  • Accuracy: 0—1.0 M: ±0.1 MΩ, 1.0—30 M: ±10 % ±0.5 MΩ

Cable tracing (Optional function)

With supplied accessory, it can do cable tracing and find the trend of the lines.

PING test

It can perform the WAN PING Test and LAN PING Test. LAN PING Test can judge if the connection with IP addresses success or not and also confirm LAN work OK or not. WAN PING test can Ping website addresses directly toward Local WAN, and check the connectivity of WAN Line.

Telephone call

Same function as a simple telephone: dial and answer. You can pick up the phone when you are testing data.

System parameters setting

Users can set the lighting length of backlight. The default time is 15s, and the utmost time is 99S. The default Auto-off time is 8 minutes; users can set the time length from 5—59 minutes. The key-press sound can be set need, or not need, and the buttons can modify the username and password, VPI, VCI, adjust contrast and Modem working mode modification and PPPoA, PPPoE, Bridge dial mode, restore the original setting, data upload etc.

  2. Ethernet LED
  3. PPP LED
  4. LCD
  5. Enter button
  6. Number button: 1
  7. Left button and Number button: 4 and Character: ghi
  8. Number button: 7 and Character: pqrs
  9. Character: * and Special Character enter button.
  10. Power button.
  11. Power off button
  12. Number button: 0
  13. Character: #
  14. Number button: 9 and Character: wxyz
  15. Down button and Number button: 8 and Character: tuv
  16. Right button and Number button: 5 and Character: jkl
  17. Number button: 6 and Character: mno
  18. Number button: 3 and Character: def
  19. Cancel button
  20. up button and Number button: 2
  21. Link LED
  22. Power LED
  23. POTS LED
  24. RJ45 port for Ethernet.
  25. Charge port for charger.
  26. RJ11 port for test line.

LED introduction

ETH LED: Shining – Ethernet link in normal condition.

Flicker – There is data flux in Ethernet.

Link LED: LED flicker slowly – finding central office,

LED flicker rapidly – xDSL Modem is doing the xDSL handing;

Shining – Link connected and work normally.

PPP LED: Shinning – successful PPPoE dialing or PPPoA dialing;      

POTS LED: Green: POTS voltage OK. Orange: POTS voltage high. No light: No voltage or voltage too low.


  • For the first time use, please make sure that the battery is fully charged before initiating machine.
  • If there is any abnormal phenomenon during operation, please restart the instrument.
  • To ensure the normal operation, please press the operation buttons for 0.5 second until you hear the tone.
  • The test result will be affected if the user terminal is in use when testing. Please disconnect the user terminal before make a test.
  • Confirm username, password, VPI/VCI and PAP/CHAP before making PPP dialing.
  • If there is ▲ or ▼ on screen, please operate as it indicates.

Operation introduction

 Turn on the tester

Pressing “ON” button for 1 second, the power LED will shine. After hearing “Di…” sound, the LCD will display the main menu that means the tester has been started.

Turn off the tester

  • When this tester is in normal working mode, press “OFF” button to turn off the tester step by step.
  • Press “OFF” button last a long time about 4~5 seconds, you also can switch of the tester obliged.
  • When the battery is in low voltage, it will power off automatically.
  • If there is no any operation of the tester for 8 minutes, this tester will power off automatically.

 Adjust LCD contrast

When the tester is “ON”, users can enter into “Sys set” interface, then enter “Regular setting”, through the “Up” button and “Down” button adjust the contrast of LCD.

Backlight function

During the operation, the operator can press “Backlight” button to turn on or turn off the backlight. In normal condition if there is no any operation on keyboard after 15 seconds, the tester will shut off automatically.

Initiate modem

After power on, the tester will enter into the main menu, Press “OK” to perform xDSL Test. Firstly, the tester will initialize the Modem. If the modem initialization fails, the system will make the Modem reposition, if also failed, the tester will back to the main menu.

Data upload

Data line connection as following:

Now connect the RJ45 point on the “data line” to the LAN port, another point connect to the computer.

In the sys set menu, move the cursor to the Upload by “Up”, “Down”, “Left” and “Right” button as below picture shows:

 xDSL test

xDSL test also called physical layer test, for testing the physical parameters of xDSL lines, including the current state, link mode, up / down rate, the max rate, the capacitance, noise margin, the power attenuation, power output, CRC error, HEC error, FEC error, LOS error, NCD error and channel bit chart. The details refer to the following picture.

Physical layer parameter test

In xDSL test window you could browse many parameters by pressing ▲ or ▼ according to the indication. The parameters include current state (State), Quality of Service (QoS), Link mode, up/down stream rate (Up/Dn rate), up/down max rate, up/down attenuation(Up/Dn Atten), up/down noise margin(NoiseMar) and up/down output power(Output PU/D).

The parameters are divided into 2 groups. Bars on left show the parameters before synchronization while bars on right the parameters after synchronization.

Fitful LNK LED shinning – Modem is not in synchronization and current state is “connecting”.

Steady LNK LED shinning – Modem is synchronizing and current state is “connected”.

Before Modem synchronization      After Modem synchronization

↓                          ↓

Link mode:

ADI: ADI mode of ADSL;

G.dmt: ADSL G.DMT mode, ITU-T G992.1 standard compliance;

G.lite: ADSL G.LITE mode, ITU-T G992.2 standard compliance;

T1.413: ADSL T1.413 mode, ANSI T1.413 issue1 & Issue 2 standard compliance.

G.dmt.bis: ADSL2 G.DMT.BIT mode, ITU-T G992.3 standard compliance;

G.dmt.bisplus: ADSL2+ G.DMT.BISPLUS mode, ITU-T G992.5 standard compliance.

ADSL2/2+:ADSL2+G.dmt.bisplus mode, ITU-T G992.5 compliance.

Service quality:

ADSL2+ Tester has 4 levels to show the service quality, that is, to show whether the line is fit for xDSL service and evaluate current service quality. They are: Excellent, Good, OK and Poor.

Save test records

Click “Esc” button to return main menu if Modem is not in synchronization. If the modem has been in synchronization and tester will display following content.

Press “Esc” button to refuse to save record and return main menu; while press “OK” button to save record and its record number will be displayed as the right bar .Additionally this tester has a memory capacity of 50 records. Once a record is saved, the record No. will increase by one automatically. When the user tries to save 51th record into the tester, the first record will be overlapped.

The saved contents include line transmission parameters and channel bit chart as well as error code.

Operators can view saved records through “View Data”

Display bit chart

In the window Press ▼ button, if the modem isn’t synchronized, then there will not be any graph.

Press ▼ Button, the bit chart with first 102 channels will be displayed, and then next until all 512 channels are displayed; press “Back” button to return to the main menu. The number of channel bit chart will be different due to the difference of user line. Usually there are 512 or 256 channels. There will be 4096 channels when in the VDSL mode connection.

Dial test

Function introduction: PPP (Point-to-Point Protocol) designing, is aimed to establish Point-to-Point data-transport by dialing or special line. It has become a common solution scheme between the host, bridge and router. PPP link process: Stage 1: Creating a PPP link; Stage 2: user authentication; stage3: Recall network layer protocol. Using Ethernet (Ethernet) resources, carrying out PPP protocol on Ethernet to test a user authentication method, called PPPoE. PPPoE is to protect the user’s Ethernet resources, and achieve the requirements for ADSL link; it is the most extensive technical standards in application xDSL.

Uniformity, running PPP protocol on the ATM (Asynchronous Transfer Mode) to manage user authentication, called PPPoA, it is as the same as PPPoE in principle and function, but difference is that PPPoA run on ATM internet, the PPPoE work on Ethernet, so it should be suit for ATM standard and Ethernet. Physical linking refers to the following Picture.

Press “OK” button and will appears:

Dial parameters introduction and Modification:

There are 7 groups VPI/VCI parameters. Operators can modify them through management software (Refer to software manual), and also can modify them through the keys of the tester.

The tester has only one fixed PPP test account.

Operator can read or change it through management software (Only can read user name). Operator can also read or change the PPP authentication Mode to choose PAP/CHAP Authentication Mode. Before test, please confirm the fixed test account and authentication mode are correct. Operator can change user name, password and authentication mode through keys also.

Among the 7 groups VPI/VCI parameters, only when the testing line’s VPI/VCI match 1 of the 7, the user name, the password and authentication Mode are all correct, PPP dial will carry out automatically. Display “Failed to authenticate, please test turn off and test later” When dialing, because the xDSL line break in properly, and the LAN end hang up the line in a short time. It will be ok according to the operating instruction.

DMM test

Built-in digital multimeter can test the DC and AC voltage, resistance, capacitance, insulation resistance parameters. Maintenance personnel can use these functions to test if there is danger voltage, or the existence of 48 V voltages on the telephone line. As the following Pictures:

DC voltage test
The voltage test can test if there is a signal in the line. For ordinary telephone services bundled in the xDSL lines, if the line voltage is low or 0 V, means the line is not in use or under bad insulation, short circuit or open circuit, need to check the line.
In this test, the DC voltage range is -400 V ~ +400 V. When beyond the range of testing, the equipment will be prompted to “out of range”.

AC voltage test
AC voltage test can test the high-voltage alternating current in the line in order to protect the lineman. If encounter high-voltage alternating current please remove the test nips carefully to avoid electric shock.
The test is limited to the AC voltage test range of 0 ~ 290 V. The equipment will be prompted to “out of range” beyond this range.

Resistance test
Use resistance test function can determine the length of cable. Conversely, if you know the length of the cable, the resistance test result will show whether the cable connection is good or not.

Calculation formula:
L = RL / RO (Km)
RL is resistance measurements result (Ω), RO is the resistance (Ω) per kilometer.

General specifications for the 0.32 mm of copper RO = 435.2 Ω, specifications for the 0.4 mm copper RO = 278.5 Ω, specifications for the 0.5 mm copper RO = 178.3 Ω.

If the course of testing equipment tips “out of range” which shows test nips not connected or cable not looped or out of resistance range, please check the test nips or retest after loop the cable again.

In the test, if there in voltage (voltage more than 2V) in the line, then there will be a prompt “voltage”. It means this line have electricity and cannot test the resistance. Check the lines and test after cutting the electricity.

Capacitance test

Use of capacitance test function can determine the length of lines. If there is no bridge tap or waterish logged, we can get the length from the test result of the capacitance.

Calculation formula:

L = Cab / CO (Km).

Cab for capacitance test result (nF)

CO capacitance result (nF) per kilometer.

Commonly use telephone cable capacitance per kilometer: CO = 51nF.

If the tester prompts “out of range”, that means capacitance out of range or the cable have faults, please re-test after checking the lines.

Conducting this test, if the lines have voltage (voltage more than 2 V), the tester will prompt “voltage!”, and then return to the test menu. This means the line have electricity and cannot test the capacitance, please check the line and retest after cutting the electricity.

Insulation test

Insulation test can test the insulation status of the line. If the insulation resistance value is small, means the insulation is bad, this will the make quality of the transmission very bad, need to repair. General for ADSL lines, insulation resistance value should be more than 10 MΩ.

In this test, if the line have voltage (voltage more than 2 V), Tester will prompt “voltage!” This means the line have electricity and cannot test the insulation, please check the line and retest after cutting the electricity. If the line resistance out of value range, the tester will show “Out of 50MΩ”, that means the insulation is good.

Notice: When testing insulation, tester will bring a 100V’s voltage, operate it very carefully and do not touch the test nips by hand!

Cable trace

Applications: It is used to trace the routing path in the disorderly lines.

Method: When the tester enters into the cable trace interface, the tester will produce composite high-frequency signal sound “dudu…” The receiver head can close to the cable with the help of the receiver end. The receiving end will amplify the received signal and broadcast audio signal. You will hear “dudu…” sound; it is louder near the clip line, the smaller the contrary. The composite high-frequency signal will turn off when exiting the tracing interface.

Modem emulation

Function Introduction: If the Ethernet cannot be connected, firstly, we should test the Modem is good or   not. We can use tester replace the user’s Modem.

Tel dial

Function Introduction: A normal telephone is integrated inside. The user can either answer the phone or call out during a normal ADSL test. Calling won’t interrupt the test.

You can hear dialing tone when entering into the dialing interface, press the keyboard to call out. If there is a call the POTS indicator light will flicker and a “didi” sound will be heard on any other interface except the DMM test. You can answer the phone by entering into the dialing interface as Pic. Shows:


LAN PING test → LAN ping

PING tests conducted on the LAN, according to data loss rate, judge the connection of the pinging IP address, judge the effectiveness of IP address, to confirm LAN connection (In the absence of computer).
Connect the LAN port and Ethernet port on the hub through network test line (direct line). A cross-test line is needed if connected with the computer.

WAN PING test -> WAN ping

WAN ping operations please see the dial-up test.

Connect the ADSL port to the ADSL line to do the wan ping test. Ping a website IP to the WAN direction to check WAN connectivity links.

 Charge battery

The tester has a chargeable 2800mAh Li-polymer battery. After starting the tester the battery capacity will be shown in the top right corner of LCD. When the battery symbol is empty please charge it in time, otherwise the tester will display “Switch off after one minute as low voltage”

Charge method: Insert the charger into the charge jacket which is on the top. Then connect charger with 220V AC power socket. If the LED on charger is shining and red it means that the tester is being charged. And charge time is 6 to 7 hours or so. If the LED turns green from red then the battery is fully charged. Take off the charger.

To get correct results and protect tester don’t operate the tester when being charged.

 Faults and solutions

Faults Reasons Solutions
Nothing displayed   after powering on tester. LCD contract is not proper. Adjust contrast
Link LED and PPP LED are in abnormal condition. Low voltage. Charge battery.
PPP dialing failed. Wrong username or password Input correct Username or password.
PPP dialing failed with correct username and password Parameters abnormal on the modem register Enter into the Sys set,   restore factory settings

xDSL Test Management Software:

xDSL test management software is the management software of this tester, read real-time data, parameter setting, read and save the record and record analyze functions to help you conveniently and efficiently use this tester.

Operation environment

PC with port a RS-232 connection cable.

Recommended configuration of the PC:

  • CPU: More than 1 G
  • Memory: More than 512 Mb
  • HD: More than 20 G
  • Port: One
  • Operating system: Windows XP

Connection: Put the DB9 outlet on the RS-232 line into the port on the PC, RJ-45 insert to the LAN port.

Note: The tester should be in “Data upload” state!

Suggested best screen resolution is 1024×768 pixels

Software function introduction

After connecting with the port, software will display the physical layer data statistics, channel bit chart, VCI VPI, authentication, may revised VCI VPI, authentication information, ping destination address. Instruments will read the records and documents stored in the form of local and analysis the records.

Connect this tester and Management software.

Connect the tester with PC by port, choose the port you connected, then you can find the choose port window. Choose the current port and make sure the machine is in the function of data upload, then click on OK button, the connection is successful.

Real-time data

Physical layer data

Click the icon or choose menu view-> physical data. When the connection is successful, pop up displays the physical window and show the current physical data.

Physical layer data

 Tester setting

After the successful connection between software and this tester click the chart on tool bar or you can choose the menu view->set button when the connection is successful, will pop up the set window. The set window will display the current data, if any data be changed, click “set” to confirm.


Additional information

Weight 1.1 kg


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