Duct installation must meet the following requirements: 1. The optical cable should be put through the sub-holes in the tube hole before laying. The optical cable should be inserted into the same color sub-tube in 1 hole, and the unused sub-tube mouth should be protected with a plug. 2. During the installation process, the traction force during deployment should be reduced as much as possible. The entire optical cable is laid from the middle to both sides, and personnel is arranged in each manhole to assist in the middle traction. 3. The hole position of the optical cable should meet the requirements of the design drawing, and the pipe hole must be cleaned before installing the pipeline optical cable. The sub-hole tube should expose about 15cm of the remaining length of the tube hole in the hand hole. 4. The interface between the sub-pipe in the hand hole and the plastic textile network pipe is wrapped with PVC tape to prevent the infiltration of sand. 5. When the optical cable is installed in the man (hand) hole, if there is a supporting plate in the hand hole, the optical cable is fixed on the supporting plate. If there is no supporting plate in the hand hole, the optical cable should be fixed on the expansion bolt. The mouth of the hook is required to be downward. 6. The optical cable should not be bent within 15cm of the outlet hole. 7. Plastic signs are used in each hand hole and on the optical cable and ODF rack in the computer room to show the difference. 8. The optical cable duct and the power duct must be separated by at least 8cm thick concrete or 30cm thick compacted soil layer.