This document describes the development of a simple device called SNR Over WIFI (SNoW) tester to help BSNL broadband technicians diagnose line faults without expensive test equipment. The SNoW tester uses a modified Android app called BktSnrSet and a WiFi-enabled ADSL modem powered by a 12V battery to display real-time SNR and attenuation readings from any point along the copper line between the distribution frame and customer site. Customizing the app allows technicians to troubleshoot problems by connecting the portable device anywhere on the line and observing signal levels via their phone, helping to improve service quality with minimal cost.

1. SNR OVER WIFI(SNoW) TESTER
An independent tool customization project
for BSNL Broad Band field staff.
Author : Pratheesh S
Contact : 9447936706
Version :1.0

2. The problem.
• As Broadband technicians we have to check
every faulty line without any hi-fi line testers.
• BSNL doesn`t own any such costly
SNR/Attenuation – ADSL testers for LL Copper
Line.
• Presently we are relying only on the DSL lamp
of the modem at subscribers office and if DSL
is not steady then it is difficult to diagnosis.
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3. • What if the SNR leakage happens at any other
place between MDF and Sub Office, Our staff
have only HMT or a telephone to check the line
health (which is not reliable as noise need not be
in audible form)
• A perfect line on telephone/HMT may have high
attenuation.
A B
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4. So, we need a tool?
Our requirement is a simple modem like box
with
• SNR/Attenuation display any-time, any-
where between MDF and Sub Office.
•Which should be battery powered and
handy.
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5. Copper Pair
* Intentionally avoided the complexities
ADSL Box with SNR Display
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6. Benefits of this Black Box tool.
•If we have such a tool we can
connect it anywhere in the circuit.
•We can observe the SNR leakage
real-time.
•We can save precious working
hours of line staff.
•So BSNL will have better Quality
Of Service.
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7. What if we can not afford such a tool?
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8. “If you can not afford it then make it yourself”
-A modern Proverb
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9. “If you can not afford it then make it yourself”
• Here I am proposing a simple way to
make such a tool called SNoW (SNR Over
WIFI) by yourself with locally available
accessories
• Make It Yourself.
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10. Required Hardware Accessories
• ADSL Modem-W1 Type
• Make : Syrma Technology
Pvt Ltd.
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11. Required Hardware Accessories
• 12V Battery as Power Supply
for modem.
• A UPS Battery or WLL Battery
would serve the purpose.
• Connect it with a power
code.
• Smaller-Lighter the better.
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12. Required Hardware Accessories
12 V Battery
Syrma Modem
RJ11 Jack and clips
to telephone line
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13. Required Hardware Accessories
• A basic android Smart
phone
• Needs WIFI
• Android 1.6 or
up(donut)
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14. SNoW : Hardware Diagram
WIFI Connectivity
Make : Syrma
OS: Android
12 V Battery
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15. Software Required
• DSL information of a line is available in the
Modem once the ADSL is UP
• Use TELNET to access the modem Command Line
Interface(CLI)
• So many free telnet clients are available in the
Google Playstore (You can develop one instead!)
• I picked an app called BktSnrSet from the
playstore.(I just don’t want to reinvent the wheel)
• Though BktSnrSet is made for adjusting SNR
value of a modem, we can customize and use it
for our specific purpose.
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16. Software Required : BktSnrSet
1. Open Play Store
2. Search for : BktSnrSet
3. Press->
4. Open once it is installed
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17. HOME PAGE
1
1.Click here to open Settings Page
2
1.Click here to open
Advanced Setup
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Open the installed BktSnrSet app for
Customization.

18. SNoW
Customization on : BktSnrSet app
Advanced Options PAGE
Click here to modify
Set Snr Command
into wan adsl linedata far
3
4
Click here to modify
Info Command
into wan adsl linedata near
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19. • Now connect the modem in the DSL
line any where between the MDF
and Sub office.
• And wait to get the DSL lamp steady.
• Connect the Phone to
Modem`s WIFI Network.
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20. • Press Set SNR Button
• (Which will run the
commands wan adsl
linedata far (upstream)
and wan adsl linedata
near (downstream)
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21. UPSTREAM
DOWNSTREAM
SNR : 27.0 db
Attenuation : 5.9 db
SNR : 42.7 db
Attenuation : 0.6 db
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22. We are done!! Thank you.
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23. My Previous Tools
Incase of suggestions/queries , feel free to contact.
PRATHEESH S.
HR No: 201100018
TELECOM TECHNICAL ASSISTANT
KALLOORKAD TELEPHONE EXCHANGE.
VAZHAKULAM (SD), MUVATTUPUZHA.
yespratheesh@gmail.com
+91-9447936706
Offline payment Management System used for Bill collection.
Developed for and Implemented in the CSCs of Lakshadweep
Telecom Division. This tool has been used since 2012 as there
was no CDR PMS modules available to collect LL bills, Print
receipt and Manage Payment Information.
23© Bharat Sanchar Nigam Limited. 2016