What is the key difference between PON, POL, G-PON, XGS-PON and OLAN?

So, what is the difference between PON, POL, G-PON, XGS-PON and OLAN? Do these alphabet soup acronyms all relate to the same thing and can they be used interchangeably? The answer is no – they are not exactly the same and they do have important differences.


Passive Optical Network (PON) is an umbrella industry term for fiber-based access networking architecture that is used in both 1) enterprise passive optical local area network inside buildings and across campus and 2) residential fiber-to-the-premises network that can connect a home, apartment and a business across a city.


    1. Passive Optical LAN (POL)
      • Used inside local area networks (LAN) of buildings and across campus.
      • Deployed by government, business enterprise, hospitality, education, retail, public venue and healthcare type network owners, operators and developers.
      • Connects computers, phones, servers, Wi-Fi, building automation, building monitoring, building intelligence, security surveillance, all forms of enterprise video and all IP/Ethernet devices within the digital ceiling, Internet of Things and Smart Building realm.
      • POL uses Gigabit Passive Optical Network (G-PON) technology standard ITU G.984 that provides asymmetrical 2.4Gbps downstream and 1.2Gbps upstream capacity. Today, POL also supports XGS-PON which is based on ITU G.9807.1 and provides cost-effective symmetrical 10Gbps downstream and 10Gbps upstream capacity.
      • Now, this next detail is very important because it represents the key unique difference! POL electronics manufactures make tremendous investments in additional R&D to support advance Ethernet IEEE features to satisfy true enterprise requirements (e.g. bridging, LAG, VLAN, ACL, PoE, LLDP, NAC, 802.1x, AS-SIP, PON protection, Change of Authorization, DAI, MAB, digital audio, etc…). A true Passive Optical LAN will have these features.
      • The Association for Passive Optical LAN (APOLAN) is the trade organization representing this segment.
      • There are different branded solutions of POL by the electronics manufacturers. For example, Tellabs Optical LAN (OLAN) is the Tellabs’ branded solution.


  1. Fiber-to-the-Premises (FTTP) or Fiber-to-the-Home (FTTH)
    • Used for last-mile access network to homes, apartments and businesses across a city.
    • Deployed by telecommunications service provider network operators (e.g. Verizon FiOS).
    • Connects services such as high-speed internet, phones, TV and residential Wi-Fi.
    • It too currently uses Gigabit Passive Optical Network (G-PON) technology standard ITU-T 984. However, FTTP is evolving to the next generation standard called NG-PON2 which is based on ITU-T 989 and is a more costly and complex 40Gbps solution.
    • Fiber Broadband (formerly FTTH Council) is the industry organization representing this segment.

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