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    BSNL Bharat Fiber Troubleshooting Guide : BSNL FTTH Common Problems & Solutions

    Tele Kerala (Chief Editor)By Updated:30 Comments
    BSNL is offering ultra fast fiber to the home (FTTH) broadband internet connections under the brand name Bharat Fiber across India. The PSU is providing fiber-net connections directly as well as through partnership with Telecom Infrastructure Providers (TIPs), Local Cable Operators (LCOs) and Multi System Operators (MSOs).

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    During this pandemic period, BSNL is the only Internet Service Provider (ISP) who could offer assured and dedicated bandwidth to customers for their Work From Home as well as Online Education needs. BSNL FTTH connections offer assured and dedicated bandwidth with no down time.  BSNL Fiber Broadband connections are the most dependable and trustworthy connections for your high speed internet requirement such as – Work From Home or Online Education or Online Business.


    BSNL Fiber Broadband connections are the most stable internet connectivity having low latency and assured bandwidth with symmetric download and upload speeds. However, there may be some common issues like – optical power issues, speed issues, MTU issues, DNS issues, Disconnection & Reconnection issues, VPN issues, FTTH Voice Configuration issues, ONT/ONU Configuration issues etc. Here we are trying to explain all these issues and their solutions in detail.

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions (BSNL FTTH – Troubleshooting Guide)

    PON Light Indications

    For the proper working of your fiber broadband connection, PON light should be stable in Green Light on your ONT/ONU.


    #PON Light is RED / NO LIGHT : (For some makes a separate LOSS light will be in ONU/ONT)
    ##Reason : Fiber break or Low / High Power.

    #PON Light is Blinking :
    ##Reason : OLT/ONT Configuration issue.


    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    Check the fiber connector jack at ONU/ONT, if it ‘Green’ Use ‘Green’ connector patch cord.  If it is ‘Blue’ use ‘Blue’ connector to avoid fiber loss of 2 to 3db.
    FTTH SPEED Issues
    Fiber Broadband (FTTH) Speed issues are related with following parameters:-
    #Fiber Power (Optical Power) : It should be between -14db and -25db to get optimal speed. (It will also rectify the Frequent WAN disconnection / Authentication failure.)
    #MTU Size : A maximum transmission unit (MTU) is the largest packet or frame size, specified in octets (eight-bit bytes) that can be sent in a packet- or frame-based network such as the internet. Mostly MTU size are related with network elements of different server/nodes.  We can check by different MTU sizes between 1400-1500. The most common MTU value in BSNL is 1460.
    MTU Setting on ONT/ONU
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    ONT configuration can be done through any web browser by accessing it’s IP address. (IP address will be normally written on the back side of ONT/ONU). ONT IP can be 192.168.1.1 or 192.168.0.1 or 192.168.10.1 or 192.168.18.1. Type it in any browser and login with username and password.
    Default Username & Password of ONTs/ONUs
    For Alphion
    ONT IP address : 192.168.1.1
    Username : admin
    Password : system
    For Netlink/Syrotech
    ONT IP address : 192.168.1.1
    Username : admin
    Password : stdONU101
    For Optilink
    ONT IP address : 192.168.10.1
    Username : admin
    Password : admin
    For Genexis 
    ONT IP address : 192.168.1.1
    Username : admin
    Password: <MAC NUM> in (Capital Letters) 
    For Huawei
    ONT IP address : 192.168.18.1
    Username: Epadmin
    Password: adminEp
    To change MTU value, after login, go to network then WAN as shown in the above figure. Enter the optimum MTU value (1460 for BSNL FTTH).
    #DNS : DNS (Domain Name System) will translates the domain name to the corresponding IP address so that browsers can load whatever website you want to access. This is done because we use website names like Google.com, but the browser requires an IP address for this name, so, DNS is responsible for translating this name into an IP address. 
    If the Ethernet Adaptor symbol shows Yellow Triangle Exclamation mark on it and Internet not getting, can also be solved by the below DNS setting on ONT or Ethernet IPv4 setting of system.
    Set DNS as  61.1.1.1 & 61.0.3.3 of BSNL (Primary & Secondary)
    or  
    Set DNS as  8.8.8.8 & 8.8.4.4 of Google (Primary & Secondary)
    DNS Setting on ONT/ONU

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    Proper DNS Setting will Increase the speed of Network. Login with username and password of ONT/ONU. Then go to Network, LAN IP Address and enter primary and secondary DNS addresses. 
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    We can also set DNS value individually at PC / Laptop / Mobile etc. as per requirement. DNS configuration in PC is shown in the above figure.
    #802.1p – Select as ‘Null’ in ONT/ONU configuration for better speed.
    #FTTH Speed issues : We have to check  speed in LAN connected devices/ keeping ONT in bridge mode and giving Continuous ping to ONT LAN IP, it must reach IP in =/< 1ms.
    Speed Issues in FTTH plans above 100 Mbps
    EPON/GEPON OLTs/ONTs have limitation for providing speed above 100mbps. GPON OLTs/ONTs will perform better. Customer PC/Laptop Ethernet port should be Gigabit Ethernet. Use cat 6 Ethernet cables. (Cat 6 is cable that’s more reliable at higher speeds than Cat 5 or Cat 5e.) PCs/Laptops should have enough processing capacity. Processors should be i3 or above. Most of the Mobile WiFi devices are limited with around 60 Mbps or below speed.
    FTTH SPEED Issues with WiFi
    To get better speed in WiFi, need Dual Band Antennas are required for ONTs/Routers (2.4 GHz (802.11g/N) and 5.1 GHz (802.11a/N). 

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    Range of Dual Band Antennas in WiFi
    The 2.4 GHz band provides coverage at a longer range but transmits data at slower speeds. The 5 GHz band provides less coverage but transmits data at faster speeds. The range is lower in the 5 GHz band because higher frequencies cannot penetrate solid objects, such as walls and floors.
    If any website/application is not getting in BSNL FTTH
    In Windows, open the command prompt (Go to Start and select Run & Type CMD and hit the enter key).
    At command prompt, type in ping www.yahoo.com -f -l 1492 and hit the Enter key:
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    The results above indicate that the packet needs to be fragmented. Repeat this test, lowering the size the packet in increments of +/-10 (e.g. 1472, 1462, 1440, 1400) until you have a packet size that does not fragment.
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    Begin increasing the packet size from this number in small increments until you find the largest size that does not fragment. Add 28 to that number (IP/ICMP headers) to get the optimal MTU setting. For example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal MTU setting.  Change the MTU on the routers WAN Setup.
    VPN Issues with ONT/ONU
    If a particular customer complaints about his VPN is not getting via his ONT. Please check the MTU Size needed for his VPN and apply it.
    For Eg: Global Protect VPN need 1460 in ONT & 1300 in Global Protect VPN Adapter setting.
    Most of the ONTs support VPNs.  In case of not supporting, please ask the ONT Vendor for firmware upgrade.
    How to Get Latest Firmware updates for ONT/ONU?
    To get latest ONT firmware updates – Visit:  http://bharatfibre.bsnl.co.in/ 
    Need for Firmware Update in ONT
    Firmware update can improve the Stability of ONT connectivity with OLTs and hence improved internet speed can be achieved. In Some cases malicious data upload issues can be solved by an update. VoIP issues – Eg: frequent disconnection, One side voice etc. can also be eliminated with ONT firmware update. Recent update of Netlink solved issues with VPN connectivity. Speed is also getting improved after some updates.
    Important Security Aspects 
    1. All are requested to change MODEM/FTTH ONT login password with a difficult one. (With Alphabets/ Numeric/ Special Characters).

    2. Old ONTs have firmware updates available. Please update soon. 

    3. Use carefully and only in urgent situations :Remote access like Anydesk, Ultraviewer, Team viewer etc. After use make sure that it is log off and closed.

    4. Install a good antivirus in PCs/Laptops/Mobiles. Also use firewall in OS for Internet access. 

    5. Shut down systems and Internet access devices after use. 

    6. Deny location sharing and device access for apps when it is not used(Deny full access, if it not necessary) . 

    7. Use WiFi passwords for Access points. 

    8. Don’t share your IP details, Internet usernames to anyone. 

    9. Don’t save your bank/atm/email passwords and credit card no.s in mobiles or in online platforms and also in browsers . 

    10. Stay safe with your Private Data.

    Speed Upgrade after Plan Limit
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    Please use below links for speed up-gradation after exceeding the limit offered by plan.
    BSNL FTTH (Bharat Fiber) Speed Up-gradation links

    • 172.30.3.134:9090/ssssnpm/promotional.jsp
    • https://fuptopup.bsnl.co.in

    BSNL FTTH Internet Configuration

    After login, we have to set username, password and VLAN number shared by BSNL Officials at WAN Configuration Settings. We may also change the default MTU value to 1460 which is the optimum MTU value for BSNL FTTH. Screenshots of different ONT/ONUs configurations are attached below:-

    BSNL FTTH INTERNET Configuration in Alphion ONTBSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL FTTH INTERNET Configuration in Syrotech/Netlink ONTBSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    BSNL FTTH INTERNET Configuration in OptiLink ONTBSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    BSNL FTTH INTERNET Configuration inGenexis ONT
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL FTTH VOIP – Configuration

    After login, we have to set username, password and VLAN number shared by BSNL Officials at WAN Configuration Settings.  BSNL FTTH Voice Service can be configured in two ways – 1) Using DHCP & Using Static IP. Screenshots of different ONT/ONU configurations are attached below:-

    BSNL FTTH VoIP Configuration by DHCP

    • VLAN: 1831
    • IP PROTOCOL MODE: IPV4
    • SERVICE MODE: VOICE – VOIP
    • SERVICE TYPE: SOFTSWITCH SIP
    • SIP REGISTER ADDR. : 10.187.6.12 Or kl.ftthvoip.bsnl.in
    • PRIMARY SIP PROXY ADDRESS: 10.187.6.12
    • SUBSCRIBE: ENABLED
    • OUTBOUND PROXY: ENABLED
    • OUTBOUND PROXY ADDRESS: 10.187.6.12
    • SIP DOMAIN: 10.187.6.12
    • SESSION TIMER ENABLED
    • LINE 1 ENABLED
    • ACCOUNT NUMBER: 9147********
    • ACCOUNT NAME: 9147********
    • PASSWORD: xxxx ( Password will vary, It depends on the creation at NIB/ Soft Switch for each number)

    BSNL FTTH VoIP Configuration in Netlink ONT

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL FTTH VoIP Configuration in Huawei ONT
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL FTTH VoIP Configuration in Genexis ONT
    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL Bharat Fiber (FTTH-Fiber Broadband) : Common Problems & Solutions

    BSNL FTTH VoIP Configuration by Static IP

    • VLAN: 1830
    • IP PROTOCOL MODE: IPV4
    • SERVICE MODE: VOICE
    • IP ADDRESS/SUBNET MASK/GATEWAY : BY NIB
    • PRIMARY DNS: 172.30.249.3
    • SECONDARY DNS: 172.30.249.19
    • VOIP :
    • SERVICE TYPE: SOFTSWITCH SIP
    • PRIMARY SIP REGISTER ADDR. : “VOICE IP”
    • SECONDARY SIP REGISTER ADDR. : 10.187.6.12
    • PRIMARY SIP PROXY:
    • ADDRESS: 10.187.6.12
    • SUBSCRIBE: DISABLED
    • OUTBOUND PROXY: ENABLED
    • OUTBOUND PROXY ADDRESS: 10.187.6.12
    • SIP DOMAIN: 10.187.6.12
    • SESSION TIMER ENABLED
    • LINE 1 ENABLED
    • ACCOUNT NUMBER: 9147********
    • ACCOUNT NAME: 9147********
    • PASSWORD: xxxx ( Password will vary, It depends on the creation at NIB/ Soft Switch for each number)
    BSNL Customer Care for Bharat Fiber ( BSNL FTTH)
    Customers may contact the following numbers for support / assistance.

    Toll Free numbers
    1800-345-1500 
    or
    STD Code + 12678 (Available during Office Hours)


    Dear readers, please share this information among your friends who are using BSNL Bharat Fiber (FTTH). How many you have faced issues with BSNL FTTH connection?
    Share.

    Tele Kerala is the Chief Editor of KeralaTelecom.Info. He is having more than 13 years of experience in Indian telecom field. He is always interested in learning latest trends and developments in telecommunication sector.

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    View 30 Comments

    30 Comments

    4. napsterstiffler on

      Is it just me or is the selfcare websire completely broken? i can't register my old broadband that i need to disconnect or my new FTTH plan. It doesn't give any errors but just refuses to proceed when i try to register. Looks like the intern who made this didn't do any testing.

      Reply
    5. Srinivas on

      Hi , I WANT TO apply Parental Control on my Alphion ONT to prevent kids from accessing some websites . I tried URL Flitering in Firewall . But it is not working . How to setup URL Filtering . Please advice

      Reply
    7. Srinivas on

      Hi , I WANT TO apply Parental Control on my Alphion ONT to prevent kids from accessing some websites . I tried URL Flitering in Firewall . But it is not working . How to setup URL Filtering . Please advice

      Reply
    15. Unknown on

      Iam getting issues with voice(landline connection) while using FTTH.Current modem using is Genexis.Sometimes call not getting connected, sometimes voice not hearing while receiving incoming calls.Please help.

      Reply
    16. Unknown on

      Hi,
      In BSNL We are facing freqent disconnection.. it is visible mainly in Video Calls..
      Sudden disconnection and reconnecting again. (For example if we do half an hour video call atleast 10 timea it's happening.
      Power level is ok..
      App they are using..
      Whatsapp, BOTIM, Zoom, Webex.. all having same issue, even with Lan Cat6 cable patch cord.
      OLT Netlink, ONT – Netlink and DBC both have same issues..
      Problem omplaints gradually increasing.
      Some Online gamers also notified us.. while gaming its shows speed and ms.. suddenly ms invrease.. and disconnected then reconnecting again.

      Apprreciated if someone could help us.

      Reply
      • Unknown on

        PLEASE CHANGE THE SAME FROM OLT AS IT IS CONFIGURED FROM OLT SO AFTER MODEM RESET IT GETS RHE DATA FROM OLT.

        Reply
    23. Unknown on

      My syrotech router giving problem in connection of WiFi. I have to restart to get connected with WiFi again. LAN always works good.. is there any solution regarding this

      Reply
    26. Nithin Karaikal on

      i used desktop computers, so i insert wi fi receiver in usb, bsnl broadband signal display in available wifi list, but now i used bsnl ftth SSID not avail in available wifi networks, i search in mobile ftth wifi signal avail, what is the problem usb wifi receiver not support for ftth or else?

      Reply
    27. Rohan Ranjan on

      In my BSNL ftth landline number outgoing is working but incoming is not working…..when some one is calling it says switch off or out of reach

      Reply
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