Splitters in Passive Optical Networking (PON) installations are used to split the light coming from the OLT laser into multiple ONT fibers that go to each of the ONTs. The splitter also combines the light coming from the ONTs and enables the OLT to communicate both downstream and upstream with all ONTs. The most common splitter used in PON installations are 2:32 splitters. All 2:N splitters have two inputs on the OLT side and enable two OLT lasers to be connected for use in PON Protection Groups or PPGs. This allows protection in the case of an OLT failure and ensures service can continue operating in the event of OLT failures. Even if not installing PPGs, it is recommended to utilize a 2:N splitter as the cost differential is small and future proofs the network should protection be needed at a later date.

Typical split ratios supported by Tellabs OLAN are:

• 2:32 - 2 OLT inputs and 32 ONT outputs. This is the most common option and supports up to 20km reach.
• 2:64 - 2 OLT inputs and 64 ONT outputs. Less common and reduces the reach to less than 20km. The entire cable plant must meet the 28dB optical budget.
• 2:16 - 2 OLT inputs, 16 ONT outputs, 20km+ reach
• 2:8 - 2 OLT inputs, 8 ONT outputs, 20km+ reach

Use the following procedure to install the 2:32 Fiber Splitter.

1. Insert the splitter into the desired position and push it straight back until the mounting brackets are flush against the mounting rails.
2. Secure the splitter with four #12-24 screws. Insert the two upper mounting screws first. Do not tighten the mounting screws until Step 3 has been completed.
3. Insert the two remaining screws into the bottom mounting holes and tighten as required. Tighten the two upper mounting screws to ensure the splitter shelf is secure.
4. Obtain an SC/UPC to SC/APC jumper cable of appropriate length. Connect SC/UPC (OLT side, blue connector) to the correct OLT PON port, then connect the SC/APC (splitter side, green connector) to the #1 port on the input side of the splitter. If PPG is in use, repeat for the secondary OLT laser connection.
   1. Ensure that the key on the optical connector is oriented properly to mate with notch on the connector of the splitter
   2. Ensure that an audible click is heard when installing the cable to ensure the cable is properly seated.
   3. Clean fibers prior to every installation of a fiber connector to ensure proper cleanliness is maintained in the fiber network.
   4. Ensure that all unused fiber and splitter connectors are capped to keep connectors clean.
5. Obtain an SC/APC to SC/APC jumper cable of appropriate length. Connect one end to any output side connector of the splitter and then connect to the ONT.
6. It is important that the secondary PON fiber is not connected until after the PPG has been configured when using PON protection.  Plugging both in without a PPG configured will cause both to transmit light and interfere, which prevents the system from bringing up the ONTs properly.  
   
   
    

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