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what is a ONT and an ONU device? is it required for fiber optic internet?

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can someone tell me what are the uses of these devices?
Also what's a OLT.

Are these required for fiber optical internet? What if I need to swap my modem from century link... do I need a ONT or ONU modem device?
What do you use? which type of ONT do you recommend?
 
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ONT=optical network terminal

It's the basic thing you need for fiber, which converts light beams to electrical pulses.

VTel, has them installed on the outside of houses.
 
Joined
Nov 12, 2011
Messages
582 (0.17/day)
Location
UT,US
System Name Asrock 2013
Processor AMD Phenom II X4 965 Black Edition Deneb 3.4GHz
Motherboard ASRock 970 PRO3 AM3+
Cooling Corsair H70 for CPU
Memory 64GB DDR3 1333mhz 16x4
Video Card(s) Ati HD5770 1GB DDR5 with Massive Heatsink and 120mm fan
Storage Samsung SSD Evo 850 250GB sata3 + Samsung SSD sata3 860 500GB + 1TB SSD NVME PCIE 2.0
Display(s) Spectre 27"
Case Big Black Tower
Audio Device(s) Realtek
Power Supply EVGA 500W
Mouse Chinese gaming mouse
Keyboard Logitech corded keyboard
Software Windows 10
I need more information.
I have a C4000XG modem from century link. Is that a ONT OR ONU or OLT and which modems are hot to swap the one I got for a more capable one... you know one with USB drive support for NAS
 
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