FTTH installation and maintenance standards
Required tools for FTTH installation:
FTTH first-level optical splitting: The networking mode in which there is only one optical splitter between the user and the convergence device OLT is called first-level optical splitting. Generally, the large splitter (1:32/1:64) is installed in the optical cable transfer box in the FTTH coverage area, and is extended to the optical fiber distribution box installed in the user building through the bundled pigtail (optical cable). The leather cable to the user’s home is connected to the bundled pigtail (flange plate), and then connected to the OLT equipment in the equipment room after being aggregated by the optical splitter installed in the optical delivery box.
The optical attenuation of the FTTH first-level optical splitting networking mode is relatively small, and it is generally used in dense coverage areas. This optical splitting mode has fewer network nodes and is easy to maintain, and the user ports are limited by the number of optical cables from the optical delivery box to the building.
Computer room—optical distribution box (optical splitter)—building distribution box—user
Schematic diagram of the first-order spectroscopic method
First-class spectroscopic light box
First-class spectroscopic optical delivery box ledger
First-class optical distribution box in the building
First-class splitting outdoor optical splitter box
FTTH secondary splitting: The networking method in which there are two or more optical splitters between the user and the convergence device OLT (it is not recommended to have more than two splitters in non-special cases) is called secondary splitting. Generally, the small splitter ratio (1:2/1:4/1:8) is installed in the optical fiber junction box in the FTTH coverage area, and is extended to the optical fiber distribution box installed in the user building through the optical cable. Install cascaded optical splitters (1:32/1:16). The leather-line optical cable to the user’s home is connected to the secondary optical splitter, and then aggregated through the primary optical splitter installed in the optical switch box, and then connected to the OLT equipment in the equipment room.
The FTTH secondary optical splitting networking mode has relatively large optical loss, and is generally used in all-optical coverage cells. This optical splitting mode has less optical cable laying and is easy to expand. The user port is limited by the splitting ratio of the optical splitter in the building.
Computer room — optical distribution box (optical splitter) — building junction box (optical splitter) — user
Schematic diagram of the second-level spectroscopic method
Secondary spectrophotometric box
Two-level spectroscopic optical delivery box ledger
Secondary beam splitting box