Hello everyone!
In this article, I will continue to write about the PON system. Now, I will write about POL.
LAN (Local Areal Network) allows communication between hosts (servers, PCs, printers, etc.) within a single network. Switches and UTP cables are used for LAN realization. LAN allows the connection of hosts at a maximum of 100 m from the switch, therefore it is required for larger buildings on each floor minimum one of the telecommunications room, where the switch is located. In addition, space should be provided for the telecommunication room, power supply, UPS, air conditioning, and grounding. In contrast to the traditional LAN, new technology was introduced – OLAN.
OLAN is an abbreviation from Optical LAN. This solution introduces optical cables – SM and MM fibers. There are three solutions:
FTTO (Fiber To The Office),
FTTD (Fiber To The Desk), and
POL (Passive Optical LAN).
OLAN has many advantages over traditional LAN:
Optical cables have much larger bandwidth than UTP cables,
Optical cables have a much longer distance than UTP cables. We can use UTP cables up to a max of 100 m, optical cables with SMF up to 3000 m, and optical cables with MMF up to 2000 m.
Optical cables are immune to RF interference. It is a very useful solution for the industry.
Optical cables have smaller dimensions and weights than UTP cables, etc.
OLAN enables all functionalities as well as LAN, with significantly greater advantages - higher bandwidth, security, and reliability.
POL solution has OLT in the main equipment room or computer room and ONUs in the offices. This solution allows new services: VoIP or POTS and IPTV and/or CATV.
Figure 1. shows active components of the POL system – OLTs, indoor ONUs, and outdoor integrated ONU, and their locations.
Figure 1. Active elements of POL system
You can find more information about OLANs, in the next link: OLANs.
I will continue to write about this topic in the next article >> PON system overview (3): OLT.
Thank you!
