Splitter Installation

Laser Safety

Warning 1! Personnel handling fiber optic cables must be trained for laser safety.

Warning 2! Optical Fibers emit invisible laser radiation. Avoid direct exposure to the beam. Never look into the end of a Fiber or into a Fiber connector on a cable or a device. Permanent eye damage or blindness can occur quickly from laser radiation.

Fiber Optic Cable

Ensure that the fiber connectors are properly cleaned per local standards. Dirty connectors may result in inaccurate measurements.

Caution 1: Fiber optic cable installation and maintenance should only be performed by trained service personnel.

Caution 2:  Do not bend the fiber optic cable to a diameter smaller than 7.5cm/3 inches. Doing so may damage the fiber or prevent the signal from passing through properly.

Use the following instructions to install the 2:32 Fiber Splitter shelf: 

1. Insert the splitter shelf into the desired position and push it straight back until the mounting brackets are flush against the mounting rails.
2. Secure the splitter shelf with four #12-24 screws. Insert the two upper mounting screws first. Do not tighten the mounting screws until Step 3 has been completed. The figure below shows a typical 2:32 Fiber Splitter shelf.

Splitter Shelf


 

Note: When inserting the lower-left mounting screw, ensure the frame ground is installed on the screw before inserting it into the equipment frame.

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. Remove the paint from a rail mounting hole adjacent to the lower-left corner of the splitter shelf and connect the frame ground to the equipment rail.

2:32 Splitter Fiber Connection Installation

Following the installation of the 2:32 Fiber Splitter and customer Optical Network Terminals (ONTs), fiber connections must be made between the GPON Ports in the OLT and the Splitter shelf, and from the Splitter shelf to the customer ONTs.

Use the following procedure to verify and connect fiber optic cables between the OLT and the 2:32 fiber Splitter.

Note 1: PON Protection Groups can be sourced from; 1) two PON ports on the Tellabs PON1, or 2) PON ports on different PON cards in different OLTs.

Note 2: Ensure that the proper fiber connectors are available before proceeding. The connectors on the fiber jumpers at the GPON Port require UPC connectors. Ensure that the connectors, UPC or APC are on the splitter end. The same is true for the splitter-to-ONT fiber cables.

1. Route the single-mode fiber jumper for the primary PON Protection Group primary connection from the designated PON port to the #1 input on the splitter shelf (refer to Figure below).

Splitter Connections 

2. Route the single-mode fiber jumper for the primary PON Protection Group secondary connection from the designated PON port to the #2 input on the splitter shelf.
3. Remove the protective cap from the fiber connector at the primary PON card.
4. At the OLT supplying the primary input, clean the connected fiber, according to local practices, and insert the fiber into the designated PON port. An audible click is heard when the connector is completely inserted.
5. At the splitter, uncap the fiber connector.
6. Clean the fiber connector, according to local practices.
7. Using an optical power meter, measure the downstream 1490nm power level.
8. Record this as the Primary_In level.
9. Clean the fiber connector, according to local practices, and connect the Primary PON input to the splitter.
10. Repeat Step 1 for the PON Protection Group secondary connection from the designated PON port to the #2 input on the splitter shelf.
11. Record this as the Secondary_In level.
12. Clean the fiber connector, according to local practice, and connect the Secondary PON input to the splitter.
13. Calculate the difference between the Primary_In and the Secondary_In input power levels, plus an offset of 5db.
14. If the Primary_In power level is not greater than, or equal to, the Secondary_Inpower level, plus the 5db offset, add a 5db attenuator to the Secondary PON input.
15. Clean and connect each OLT output fiber connector to the designated splitter shelf output.

Cable Routing and Management 

Dress all cables connected to the OLT neatly and route them such that they are out of the way and cannot easily be stepped on or tripped over.

Try to bundle cables that are going to the same place using cable ties. Reusable Velcro ties allow additional cables to be added to the bundle, or unused cables to be removed from the bundle easily.

Caution: An optical fiber cable can perform poorly or be damaged if the minimum bend radius of the cable is exceeded. Any coil of fiber must be at least 6 inches in diameter to ensure that the minimum bend radius is met. Ensure any Nylon zip ties do not crush the cable.