1. The process of installing FOSC.
1.1 Step One - Open the closure
1.1.1 Cleaning the locale and determine where to install the FOSC and then place
fiber cables required.
1.1.2 Check whether the main components and accessories have been well prepared
inside the package.
1.1.3 Open the closure
① Demount hoop fixing bolt and pull hoop locking system out, then proceed in
demounting the hoop.
② Pull the FOSC cover upwards out, installation could begin.
1.1.4 See Drawing 1
Important issues: If the weather condition is not good enough, then a tent must
be pitched for waterproof and dustproof.
1.2 Step Two -Determine length of fiber cable to be fixed and stripped inside FOSC
1.2.1 If all fibers are for branch splicing, please refer to Drawing 2(A) for stripping length.
1.2.2 If some fibers are for straight-through, while others are for branch splicing, please refer to Drawing 2(B) for stripping length.
1.2.3 See Drawing 2.
Important issues: 1. Reserve enough length of fiber cable to be spliced.
2. Stripping length also could be decided by customers according to
1.3 Step Three –Strip off protective coat of fiber cable and fiber
1.3.1 Strip off protective coat of fiber cable from the temp. locating mark with the cutter and
the stripper, please refer to Drawing 2 for stripping length. Stripping length also could
be decided according to installation requirement
1.3.2 See Drawing 3.
Important issues: If it is difficult to pull all the protective coat of fiber cable at one time, strip
it off section by section to avoid fiber breakage.
1.4 Step Four – Separate fiber cores and prepare work prior to fixing fiber cable.
1.4.1 Wind 2 layers of insulation tape on protective coat of fiber core for protection.
Meanwhile, get rid of the stuffing to separate fiber core and clean them. Form a ring
with the diameter of 100mm or so and fix it on the fiber temporarily by adhesive tape.
1.4.2 Depending on fiber cable stripped, the following two cases are available.
① All fibers are to be branched after being spliced completely.
② Some of fibers are for straight-through after being winded, while the others are for
1.4.3 The FOSC is provided with 3 single entry/exit tubes which suit for single fiber
cables with max. diameter ф20mm and 1 mass entry/exit tube which suits for 1
piece of fiber cable with max. diameter ф 20mm or 2 pieces of fiber cables with max.
diameter ф 15mm or multi-pieces of fiber cables with short diameter.
1.4.4 Mass entry/exit tube is required if some fibers are for straight-through
1.4.5 The corresponding entry/exit tube cover could be slightly knocked out with
screwdriver from inside to outside according to number and diameter of fiber cable
1.4.6 Reserve reinforced core in 70mm length and cut off the unnecessary ones.
1.4.7 See Drawing 4 and Drawing 5.
Important Issues：Entry/exit tubes are to be selected accurately to make it easy for splicing and sealing.
1.5 Fixation of reinforced core, and pyrocondensation, fixation & sealing of fiber cable.
1.5.1 Insert fiber cable into the corresponding heat shrinkable fixing tube, further insert the
them into entry/exit tube at the bottom of FOSC.
1.5.2 Demount fixing nut of reinforced core with a special wrench (plastic one), which is to be inserted into the fixing slot afterward and tighten it. Then retighten it with a metal wrench (the metal wrench is to be provided by operator).
1.5.3 Hitch heat shrinkable fixing sleeve to the fiber cable till its root by hand.
1.5.4 Please refer to Drawing 5 for installing branching clip.
5.5.5 Heat shrinkable fixing sleeve with fire sprayer to make it hugging entry/exit tube
and fiber cable to reach complete sealing.
1.5.6 See Drawing 5
important issue: 1. Fixing nut of reinforced core should be tightened.
2. While heating, heat shrinkable fixing tube should shrink evenly, and there
should be no bubbles, pores and other defects inside the tube.
1.6 Step Six - Splice fibers
1.6.1 Follow user manual of fusion splicing machine to splice fiber.
Important issue: pay attention to the twist and bend of fiber
1.7 Step Seven -Install heat shrinkable protective sleeve and house fibers.
1.7.1 When having completed splicing the fibers, the first fiber ring should be housed
on the farthest side of FOST, the remaining fiber optic should be winded, forming a ring
with diameter not less than 80mm. then put it into FOST (Fiber Optic Splice Tray)
together with heat shrinkable protective sleeve.
( Firstly fix heat shrinkable protective sleeve into the slot, then enlarge the diameter of
fiber ring properly.)
1.7.2 see Drawing 6
Important issue: pay attention to the twist and bend of fiber.
1.8 Step Eight - Check up comprehensively
To ensure the technical requirements, the following instructions must be followed:
1.8.1 Fibers with protective coat are fixed with nylon tie at the entrance of FOST.
1.8.2 Grommet should be pressed from inside to outside in order to properly install FOST.
1.8.3 Straight-through and reserved fibers with protective coat should be winded to the fiber holding tray.
1.8.4 Check whether the internal tighteners and fixing nut of reinforced core are well tightened.
1.8.5 Check whether seal fitting is installed neatly and smoothly.
1.8.6 Check whether heat shrinkable fixing sleeve is reliable and sealing completely.
1.8.7 See Drawing 7.
Important issues: If any problems occur, they should be solved right away.
1.9 Step Nine – Assemble FOSC housing and fix FOSC
1.9.1 Put desiccant into FOSC.
1.9.2 Put FOSC cover on base directly.
1.9.3 Install plastic hoop between FOSC cover and base, tighten hoop locking system,
which is to be fixed by hoop fixing bolt then.
1.9.4 FOSC installation
① Aerial application: fix metal hoop and transom to the pole. Please refer to Drawing 8
② Wall mounting application: fix the bracket on the wall with bolt. (metal hoop is not
③ Underground application: metal hoop is not required.
1.9.5 See drawing 8
Important issues: 1. Pay attention while installing plastic hoop.
2. The specification of bolt for fixing the bracket is M8.