Wednesday, 3 June 2026

FTTH ONT (modem) configuration

FTTH ONT (modem) CONFIGURATION

Question 1 of 5

FIBRE POWER SHOULD BE BETWEEN
-15 TO- 25 DB
-25 TO -50 DB
-14 TO -25 DB
-50 TO -75 DB

ans: -14 TO -25 DB

Question 2 of 5 (Single selection-MCQs)

DEFAULT GATEWAY IS
192.168.1.1
168.192.1.1

Ans: 192.168.1.1
Question 3 of 5 (Single selection-MCQs)

If LOS Light is RED/ NO LIGHT :
Both II & III
Normal operation
Low/High Power
Fiber break
Ans: Fiber break

Question 4 of 5 (Single selection-MCQs)
Flag
If PON Light is blinking :
Normal operation
Fiber break
Low/High Power
OLT/ONT Configuration issue



Question 5 of 5 (Single selection-MCQs)

DEFAULT MTU
1592
1460
1492
1596

Ans: 1492
MTU SIZE : 1492 DEFAULT IN ROUTER
MTU SIZE : 1400  by changing to 1400, improvemetn in speed observed
MTU SIZE : 1200/1300 FOR sloving VPN, google meet, Zoom issues

DNS GOOGLE : 8.8.8.8;    1.1.1.1;    8.8.4.4

Optical power level (OLT uplink) 
 19to -18 dBm


Optical power level (ONT uplink) 
 -14 TO 24 dBM

In computer networking, MTU stands for Maximum Transmission Unit, which represents the largest size data packet (measured in bytes) that a network-connected device can accept and transmit in a single transaction  

1500 Bytes: Standard for Internet and Ethernet networks.

1492 Bytes: Optimized standard when using PPPoE connections

















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