xDSL Tester with ADSL, VDSL2, VFL Etc. (Large Data Store)

Handheld device used to test all networks effectively while maintaining a large date store and an advanced battery



GAOTek xDSL Tester with ADSL, VDSL2, VFL etc. is especially designed for engineers working in the field of telecommunication for operation and maintenance. It adopts a mainstream Android 4.4 operation system which combines industrial smart phone and telecom test function into one device. Telecom operators can install any other application program or software in to the device. The device can improve the installation and maintenance efficiency and control efforts.

It can effectively integrate and explore the human resource value; improve the image of telecommunication installation and maintenance from the subscribers’ perception (Work Force Management System). It can realize the assets management by bar code scanning and at the same time realizes the dual management of people and goods.



Key Features

  • 720×1280 IPS true color touch screen.
  • Built-in Android 4.4 operation system.
  • Rechargeable 3.8 V 8200 mAh polymer battery.
  • Camera with 8 million pixels and support auto focus and flash function.
  • Can make a phone call through earphone and listen to music (needs earphone).
  • Supports 1D bar code scan.
  • 1.2 GHZ CPU and fast processor.
  • Strong protection against bad environment.
  • Industrial grade design, economical and durable.
  • Visible 5 inch LCD in the sunlight.
  • The storage capacity is big and extensible.
  • Advanced battery installation design and strong endurance.
  • Supports Google Play.
  • Supports DMM, VLAN, HLOG, QLN.
  • CE certified.
  • With Gigabit Ethernet port.
  • Supports a/b/g/n/ac, wifi 2.4G and 5G.
  • Supports VLC to view IPTV channel.


  • Testing of the transmission parameters in the DSL line.
  • It can eliminate the internet connect failure caused by user’s Modem faults.
  • It can perform the ONU (ONT) simulation test work, including OUN (ONT) Test and ONU (ONT) Emulation function.
  • Tester can do cable tracing, twisted pair and line distinguish.
  • Useful to check the insulation status of the line.



Technical Specifications

General Specifications
Display Screen 720×1280 TFT, true color 5 inch Capacitance touch screen
Operation System Built-in Android 4.4 operation system
System CPU is MSM8916,1.2GHZ 4 Core

RAM 1G bytes

Flash 8G bytes

Supports TF memory card (The biggest capacity is 64G)

Bluetooth Support 4.0
WIFI Support IEEE 802.11b/g/n

GSM 900/1800/1900

Power Supply Rechargeable 3.8 V 8200 mAh polymer battery and the max power is 3 W.
Camera 8 million pixels post position camera and support auto focus and flash function.
Dimension 7.12 in x 3.4 in x 1.77 in (181 mm x 87 mm x 45 mm)
Frequency Range 5 MHz ~ 1000 MHz
Accuracy ± 50 × 10-6
Weight  1.21 lbs (550 g)
xDSL Index
xDSL test main functions Physical Layer Info

PPPoP Dial

FTP Client, Fixative IP

Network Layer Test

Modem Emulation



Error Code Statistics

Bit Graph Display


Modem Parameter Setting(VPI/VCI)

ADSL Index
Standards ITU G.994.1 (G.hs), ITU G.992.5, ITU G.992.5 Annex L. The max distance which can be connected is 6.5km. Be compatible with ADSL, ADSL2 and READSL.
Attenuation 0 dB ~ 63.5 dB
Noise Margin 0 dB ~ 32 dB
Upstream Channel Rate (inter-weaved / fast mode) 0 Mbps ~ 1.2 Mbps
Downstream Channel Rate (inter-weaved / fast mode) 0 Mbps ~ 24 Mbps
The modulating bits in the DMT sub-channel 0~15 and each sub-channels’ frequency points
The number of error codes CRC, HEC, FEC, NCD, OCD
Other Parameters The output power of DSL

It can display every condition of the DSL line: lost signal and shutdown of link

VDSL2 Index
Standards ITU G.993.2(VDSL2). Be compatible with ADSL2+, ADSL standard.
Upstream Channel Rate (inter-weaved / fast mode) 0-100 M
Downstream Channel Rate (inter-weaved / fast mode) 0-100 M
The modulating bits in the DMT sub-channel 0~15 and each sub-channels’ frequency points
The number of error codes CRC, HEC, FEC, NCD, OCD
Other Parameters The output power of DSL

It can display every condition of the DSL line: lost signal and shutdown of link

DSLAM information

Error seconds

INP pulse protection

SNR channel figure

Channel noise margin figure

Support Profiles Profile 8a, 8b, 8c, 8d, 12a, 12b, 17a
DMM Test Index
DC Voltage -400 V to 400 V; Resolution: 0.1 V
AC Voltage 0 V to 290 V
Capacitance 0 to 1000 nF; Accuracy: 0-10 nF: ± 2 nF, 10 nF -1000 nF: ±2 % ± 2 nF
Loop Resistance 0 KΩ to 20 KΩ; Accuracy: 0-100: ±3%±4 Ω, 100-500: ±3%, 500-20 KΩ: ±2%
Insulation Resistance 0 MΩ to 50 MΩ; Accuracy: 0-1.0 M: ±0.1 MΩ, 1.0-30 M: ±10%±0.5 MΩ
Optical Power Index
Wavelength Range 800 nm ~ 1700 nm
Photo Sensing Material InGaAs
Power Test Range -70 dBm~+10 dBm or -50 dBm~+26 dBm
Error Range ±5%
Display Distinguish Ability Linear display: 0.1%; logarithmic display: 0.01 dBm
Adapters FC, ST, SC
VFL Index
Wavelength 650 nm±20 nm
Output Power 1 mw/ 3 mw/ 5 mw/ 10 mw (optional)
Connector 2.5 mm universal adapter (SC, FC, ST)
Working Mode CW or 2 Hz modulation
Applicable Fiber SM / MM
Field Strength Meter Index (TV Signal Level Meter)
Frequency Index Frequency Range: 5 MHz ~ 1000 MHz

Accuracy: ±50×10-6 (68 ℉ ± 41 ℉ or 20 ℃ ± 5 ℃)

Resolution: 10 KHz

Receive Bandwidth: 280 KHz

Digital TV Measurement Power Level Range: 30 dBμV ~ 120 dBμV

Accuracy: ±1.5 dB

Resolving Ratio: 0.1 dB

Standard Modulation Format: DVB-C/ITU-T 64/256 QAM

Power Support: QAM, QPSK, COFDM

Symbol Ratio: 4 MS/S ~ 7 MS/S

Receive Bandwidth: 8 MHz (can set)

MER: 22 dB ~ 39 dB (±2 dB)

BER: before RS  1E-3 to 1E-9

Star Map Table

Simulate TV Test Level Range: 30 dBμV ~ 120 dBμV

Accuracy: ± 1.5 dB

Resolving ratio: 0.1 dB

Input Impedance: 75 Ω

Channel Scan

Spectrum Scan

Other Test Slope Test

Main line voltage test (0 V-100 V AC/DC ± 2 V)

Cable Tracking Index
Test Cable Type Network cable, twisted pair cable, telephone line, USB cable, coaxial cable.
Line Status Test Determine open or short circuit
Voltage Polarity Detection Positive and negative of DC voltage
Distance of Signal Transmission No less than 3 km
DC Voltage No more than 48 V
Check Line Sequence Index
Function Support generate network line signal to view the network check line sequence with the receiver.
Feature Easy to operate: determine the line sequence by receiving side lights order
Landline Telephone Index
Function Connector with telephone line, can be used as landline
Transmit Quality
Curt Rate (kbps) Transfer rate of the IPTV service packages
IP num(is) Statistics of IP package gathered in the sampling period
Losted num Data statistics of RTP package loss number gathered in the sampling period
IP Jitter Reflect levels of IP packet transmission quality
Net Configuration

(Support any net encapsulation format, include TS, TCP, UDP, RTP, RTSP, PPPoE etc.)

MDI DF Delay in MDI test regulated by RFC4445
MDI MLR Media package loss number in MDI test regulated by RFC4445 Source MAC: IPTV sender MAC
Dst Mac STB MAC address
Tos TTL IP protocol information
Source IP IPTV sender IP
DstPort STB IP
Source Port IPTV sender port
Dest Port STB port
Rtp type RTP protocol information
MLR-15 Statistical value of MLR in 15 minutes
Losted total RTP packet loss total number in test cycle
Rate Current test cycle rate, including maximum, minimum and average statistics
ONU (Support ZET Equipment)
 ONU Test
Registration State none O5 Operation
Authentication State Registered, authenticated Success
Output Power +0.5 dbm ~5 dbm +0.5 dbm~5 dbm
Input Power -27 dbm~-8 dbm -27 dbm~-8 dbm
Supply Voltage 3100 mV~3500 mV 3100 mV~3500 mV
Bias Current 0 mA~90 mA 0 mA~90 mA


Ordering Information

Ordering Information Module Code
Standard/Basic Part
Optional Module
xDSL ADSL2+ Module A
VDSL2   Module V
1D Bar Code Scanning Module B
Optical Power Meter Module G
VFL Module H
DMM Function D
Cable Tracing X
Landline Telephone T
Cable Line Sequence W
Field Strength Meter (TV Signal Level Meter) F

Note: The optional module “V” will come with the optional module “A” function. The optional module “O” will not go with the optional module “A” or “V” and “F” at the same time.

Packaging List

No. Item Description Quantity
1 xDSL Tester with ADSL, VDSL2, VFL Etc., (Large Data Store) 1
2 User manual 1
3 Power Adapter 1



Additional Information

Product Description



Sr.No. Description Function
1 VFL port Connect with the fiber interface, red light test fiber optic connection
2 Optical power port Connect with the fiber interface, test optical power
3 Dust-proof cap of optical port Protect the optical port from dust and water
4 Scanning head Window of barcode scanning engine, which is used to scan the barcodes.
5 ONU (ONT) port ONU (ONT) fiber port
6 Dust-proof cap of electric port Protect the electric port from dust and water
7 Ethernet port The port to connect with Ethernet, can be used for network test
8 Seat-type charger cathode Seat-type charger cathode
9 RJ11 port Connect with telephone line to test xDSL, and cable tracing single output port
10 HDMI port Video source tester input port
11 USB port USB port, connect PC or charge
12 Charge port Charge
13 Seat-type charger anode Seat-type charger anode
14 Bottom dust-proof cap Protect RJ11, RJ45, USB and charge port, protect from dust and water
15 Receiver Receiver
16 Front camera Make a photo or video
17 Indicator Indicate the conditions of the equipment
18 Display Screen display
19 MIC Landline telephone function MIC
20 Keyboard Function key, detailed functions as below
21 MIC Mobile phone MIC
22 Rear camera Make a photo or video
23 Loudspeaker Equipment loudspeaker
24 LED light LED light also can be used as flashlight
25 Fixed groove of the hand belt Used to fix the hand belt
26 Battery cover screw Fix or loose the battery cover
27 Battery cover Fix the battery
28 Hand belt Used for holding the equipment
29 SCAN side key Scan shortcut key
30 RFID side key RFID shortcut key
31 Earphone hole Connect earphone
32 Volume key Adjust volume of phone call or the loud speaker

General Functions

OTG USB Function

Through USB OTG data line can connect phone to USB, transfer files and data backup. The phone support USB storage device including U dish, reader and phones which support USB large capacity storage function. After connecting USB equipment and upload successful it can read the data in the USB storage equipment.

Charge Function

Using direct charger, current can be 1.5 A. And support micro USB charge, current can be 500 mA.

Network Card

To open the device’s network card, pull down the prompt bar and click the LAN icon  (blue icon means the network card was turned on, white means closed.) as shown below:

Select Using LAN to open the network card, you can choose DHCP or STATIC IP. Click again to get IP address from DHCP server at DHCP mode. At STATIC IP mode, DNS includes DNS1 and DNS2. Firstly, you need to set DNS1.

PPPoE Dial

To make PPPoE dial, you need to pull down prompt bar and click PPPoE icon  (blue icon means PPPoE dial is connected, while white means PPPoE disconnected), please see the following pictures:

Usage of Main Functions

On the standby screen, click icon  , showing main menu, as below:

Keep pressing the icon, you can move where you want. Then release, in this way, you can put the function what you like desktop (during moving, keep pressing the icon and do not release)

Test Function

The test function is professional test software, which includes xDSL test, Modem emulation, ONU (ONT) tester, ONU (ONT) emulation, optical power test, visual fault locator, network layer test, E Netcom; download meter, FTP client, etc. The customer can choose the corresponding functions. Please see the following picture:

xDSL Test

Through inner xDSL Modem, you can test xDSL line. It includes physical layer info, modem setting, web and Network layer test.

Physical layer info can test physical layer parameter, which includes current status, connection mode, upstream/downstream, noise margin, attenuation, and the output power, error codes of CRC, HEC, FEC, NCD, OCD and channel bits picture.

Using this function, user can check whether there is a problem in the user line or not, check the user line parameter, resolving the problems due to users’ modem and computer.

Test interface will show each value parameter to reflect the current state.

Via xDSL current state, you can see the connection between xDSL and local side equipment. Current connection mode is displayed as connection mode.

Please see the following pictures:

ADSL2+ Physical layer parameter ADSL2+ Error codes statistics

VDSL2 Physical layer parameter 1 VDSL2 Physical layer parameter 2

VDSL2 Error codes statistics

The current status means:

Handshake: Shake hands

Discovery: Discover the local side DSLAM;

Training: It is training;

Showtime: Far-end DSLAM is connected.

Connection mode means:

G.DMT: ADSL G.DMT protocol mode, in accordance with ITU-T G992.1 standard;

G.LITE: ADSL G.LITE protocol mode, in accordance with ITU-T G992.2 standard;

T1.413: ADSL T1.413 protocol mode, in accordance with ANSI

T1.413 issue1 & Issue 2 standard;

ADSL2+/ADSL2+: ADSL2+ G.DMT.BISPLUS protocol mode, in accordance with ITU-T G992.5;

ADSL2+: ADSL2+ G.DMT.BIS protocol mode,in accordance with ITU-T G992.3 standard;

VDSL2:ITU-T G.993.2 (VDSL2);

Physical layer parameter:

Activating times: Display the active times from the beginning of test to current time, the activation time will increase one with each active.

Test Duration: Display the time from starting physical layer test after Modem initialization.

User can check the current channel bit value in the channel bit interface, and the value will be displayed in graph. User can see the test result in text through pressing text button.

Modem parameter setting

It includes Modem mode setting and VPI/VCI setting.

In Modem Setting, you can set up modem working mode and seven groups VPI/VCI value.

The setting interface will show 7 groups of VPI/VCI parameters which were set already. If it needs to be modified, type new VPI/VCI value from VPI and VCI bar. Click “Set”, and the Modem VPI/VCI will be set (can be saved even if power off)


If the MODEM mode modified to another mode, please exit the xDSL Test and re-enter it again. Otherwise, the mode modifying will not be effective.

Modem parameter setting interface is as following:

ADSL 2+Modem parameter setting interface

VDSL2 Modem parameter setting interface 1

VDSL2 Modem parameter setting interface 2

PPPoE Dial

PPPoE is in the status bar, pull-down, as shown following:

Click  icon , the dialing window will pop up,input user name and password, click “connect” to do the PPPoE dial, the equipment will memorize user name and password automatically. User can test the web browsing after dial succeed. As following picture:


After PPPoE dialing successful, click web icon to open the browser and input the address, and then click the triangle arrow or click OK on the keyboard to enter into the website. User can test the connectivity of the xDSL line.

After entering back, you need to choose Close modem power supply or keep modem power supply. If xDSL is needed for external use, choose Keep modem power supply, otherwise, choose Close modem power supply.

You can also press menu button to back to main menu, and then enter menu to the PPPOE dial.

xDSL test process is:

xDSL physical layer test—>PPPoE dial —>Web log test.

If other program uses xDSL for Internet access, you need to select keep modem power supply when exiting xDSL Modem test.

Insert telephone line into RJ11 port when testing, as follows:

xDSL test wiring diagram

Entering into xDSL test, then click physical layer test interface, it can show data of activation situation, etc. When activation indicator on for long time, the line activated, it can show the up/down stream rate, noise margin, attenuation, the output power, the number of error codes (CRC, HEC, FEC, NCD, OCD) and parameter as channel bits picture, etc. User can check all test data by sliding screen under the test parameter interface. Then press PPPoE dial, input the user name and password, and then do the landing page test after success dialing.

ONU (ONT) Test (Optional function)

The Telecom test PDA with OUN test function is a professional tool for telecom operator to do the ONU (ONT) simulation test work, including OUN (ONT) Test and ONU (ONT) Emulation function. It can fully simulate the ONU (ONT) function, and can easily view the running parameters on the optical line, easy to view the problem, efficient troubleshooting

ONU (ONT) function and use method

First, connect the terminal with ONU function to the telecom operator’s optical line through optical fiber; open the Test interface, including “ONU Test” and “ONU Simulation” function, as shown below:


ONU (ONT) Test

“ONU (ONT)” test is the terminal ONU (ONT) function completely replaces the user ONU (ONT); you can view the various parameters of ONU (ONT), configure registration parameters, and establish business connections. Click “ONU test”, wait for ONU (ONT) initialization, and then enter the ONU (ONT) test interface successfully. In the “ONU (ONT) test” interface, contains the “ONU (ONT) state” and “ONU (ONT) setting”, as shown in the following picture:

Optical Power Test

Optical power test can test the power of optic fiber, insert the pigtail of optical signal to be tested into the optical interface can test optical power, please see the picture:

There are six wavelengths as calibration wavelength, choose corresponding wavelength can test current optical power value. It is shown as dBm and nW when having a test. User can stop testing by pressing “Stop Test”, and the data displayed is the latest testing result. You can also choose save current test result, in help of checking afterwards.

Visual Fault Locator (Optional)

Click “Red Light”, the tester can be used as the visual fault locator, can output the CW and 2 Hz modulation. As follows:

Click “Open” to turn on the VFL, and click “Close” to turn off the VFL. CW/2Hz is the switch button of the continuous and modulated light, the tester can memorize the VFL mode automatically.

The output power is 1 mw/3 mw/5 mw/10 mw (optional).

Cable Tracing (Optional)

Tester can do cable tracing, twisted pair and line distinguish. Tester can produce special video signal and inject it into cable, and the video signal will be leaked during the transmission, and user can receive the signal by receiver, and do the route test to find different cable.

Click the Tracing icon to enter into the route test interface. As follows:

Click “Open” to start cable tracing, tester start sending video signal, and then click “Close” to stop the video signal sending, and user can exit cable tracing by pressing return.

Turn on the receiver, connect the bottom test line to the cable needed to be test, and the click “Open” icon button, the receiver will start inspection. Keeping the video signal, and then you can find the route of the wiring.

Landline Telephone Function (Optional)

Main functions of landline telephone: Dial and receive telephone

Use Instruction: In Android interface, click “Test” icon, and then click “Landline Telephone” to open the Landline Telephone interface, now it is on the hook off state, as below left picture:

Landline Telephone interface Dial interface Call interface

Exit Instruction:

Click the “Back” button twice continuously to exit the Landline Telephone test

Network Layer Test

Network layer test which including Ping test, ifconfig test, Route test and Trace route test. Sliding screen can switch test items.

Ping test:

ifconfig test:

Route test:

Trace route test

DMM Test (Optional)


Click “TEST”, choose “DMM” you can inter DMM interface

When exit DMM test, if the line voltage is greater than the safety voltage, in order to protect the circuit, not allowed to exit the DMM test, it will show up a hint “a line voltage is greater than the safety voltage, cannot exit the DMM test prompt”. Only eliminate the voltage on the line or the voltage is less than the safe voltages to return to the main interface, the usual method is remove the test line. Safe voltage: DC 80V, AC 50V, AC50V ~ AC80V, is in a critical state, sometimes can be directly exit the DMM test interface, sometimes unable to exit, but in more than 80V of the DC voltage and AC voltage are not back to DMM test interface.

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.

The test is limited to the DC voltage test in range of -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 in range of 0 ~ 290 V. The equipment will be prompted to “out of range” beyond this range.

Loop 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)—————————①

①: RL is resistance measurements result (Ω), RO is the resistance (Ω) per kilometer.

General specifications for the 0.32 mm copper RO = 435 Ω; specifications for the 0.4 mm copper RO = 279 Ω specifications for the 0.5 mm copper RO = 178 Ω, specifications for the 0.6 mm copper RO = 132 Ω. you can also choose “use custom parameter”, like the following picture:

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 checks the test nips or retest after loop the cable again.

In the test, if there is 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. Please check the lines and test after cutting the electricity.

Capacitance test

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

Calculation formula: L=Cab/CO(Km)———————————-②

②: Cab for capacitance test result (nF), CO capacitance result (nF) per kilometer.

Click Cable length of Cap Test, you can enter calculate length interface, you should type the numbers can calculate the length of cable. Like the following picture:

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 2V), the tester will prompt “voltage!”, and then return to the test menu. This means the line has 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 affect the ADSL line transmission quality and need to repair. Generally for ADSL line, insulation resistance value should be more than 10 M Ω.

In this test, if the line has voltage more than 2 V, the 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 “more than 50MΩ”, that means the insulation is good.

Notice: When does Insulation test, the equipment will emerge 100 V dangerous voltage, please do not touch the test fish clip!

Barcode Scan Test (Optional)

Open the “Read Serial” software on the tester, interface as shown in the following picture:

In the “Read Serial” interface, after pressing “SCAN” key on the left side, it can work. Just aim at bar code with the red light the test result will show on screen. Tester can scan continuously and show the scan result in table, and record the scan time. A prompt box about whether store will be pop up when exit.


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