Sheath optical cables are mostly single-core or dual-core structures. They can also be made into four-core structures. The cross-section is in the shape of a figure of 8. The reinforcement is located at the center of the two circles. It can adopt a metal or non-metal structure. The optical fiber is located in a figure of 8 shape. the geometric center.
The optical fiber in the covered optical cable adopts G.657 small bending radius optical fiber, which can be laid with a bending radius of 20mm, and is suitable for entering the house through pipes or open wires in the building.
1. Cabling of overhead supports 1. Determine the laying route of the covered optical cable, and investigate whether there are available supports on the route for the laid outdoor covered optical cable. Generally, each support piece can fix 8 outdoor covered optical cables.2. Select supports and their installation locations based on the principles of firm installation, even spacing, and ease of maintenance.
3. Use tight hoop steel belts and tight hoop clamps to fix the tight hoop hooks on the poles; use expansion screws and screws to fix the C-shaped hooks on the exterior walls. For wooden exterior walls, they can be directly attached The ring-type draw hook is fixed on it.
4. Separate the hanging wire of the outdoor covered optical cable, tie the hanging wire to the S fixture, and then hang it on the support. When the length of the covered optical cable to be laid exceeds 100 meters, it is advisable to Choose to start the layout from the middle point.
5. Use a longitudinal wrapping tube to wrap the excess length of the outdoor leather optical cable where the suspension wire and the S fixing piece are bound.
6. The intersection between outdoor covered optical cables and other cables should be wrapped and protected with winding tubes.
7. It is strictly prohibited to step on or block the outdoor covered optical cable during the entire cabling process. If the outdoor covered optical cable is found to be damaged, consider re-laying it.
2. Nail the cables along the exterior wall of the building or outdoors 1. Select the route for nailing the leather optical cable. Generally, the leather optical cable should be nailed to the wall that is hidden and difficult to reach by human hands.
2. Nail buckles should be used to fasten the covered optical cables indoors; screw buckles should be used to fasten the outdoor covered optical cables outdoors.
3. While installing the nail fastener, the leather optical cable can be fixed in the nail fastener. Since the nail buckle and the screw buckle are fixed by clamping the outer sheath of the leather optical cable, so During construction, attention should be paid to visual inspection while fixing the covered optical cable. It must be ensured that the covered optical cable is not twisted and that the nail fasteners are not squeezed on the covered optical cable.
4. At the corner of the wall, the leather optical cable needs to leave a certain arc to ensure the bending radius of the leather cable, and use a sleeve to protect it.
It is strictly prohibited to turn the leather optical cable against the wall at right angles.
5. When using the nailing method for cabling, special attention must be paid to bending, kinking, twisting, damage and other phenomena of the leather optical cable.
6. After the covered optical cable is laid out, the covered optical cable needs to be visually inspected throughout the process to ensure that no external force is generated on the covered optical cable.
7. When the covered optical cable is laid outdoors along the exterior wall of the building or nailed outdoors, the steel strands of the covered optical cable should be tightened appropriately to withstand the tensile force, and the tensile force should not exceed that of the covered cable. The rated tensile force value of the optical cable, andSecure the strands securely as required.
3. Cabling in the wire trough 1. Select the routing in the wire trough.
In order not to affect the appearance, leather optical cables should be laid out along skirting lines, door frames, etc., and routes with fewer corners and flat and smooth walls should be chosen (can be fixed with double-sided tape) wire duct).
2. Select the wire trough installation method (double-sided tape or screw fixation).
3. When using double-sided adhesive tape, wipe the wall on the wire trough with a cloth to make sure there is no dust and garbage on the wall, and then apply double-sided adhesive tape to the wire trough and the Its accessories are attached to the wall.
4. When using screw fixation, the wire trough and its accessories should be fixed on the wall according to the screw fixing positions marked on the wire trough and its accessories. Generally, 3 screws are required for a 1-meter straight trough. screws to secure.
5. Combine the wire trough and its accessories according to the actual situation on site. When cutting straight troughs, since the wire trough cover and bottom trough are paired, it is generally not suitable to process the wire trough cover and bottom trough separately. .
6. Put the leather optical cable cloth into the trunking. When closing the trunking cover, be careful not to clamp the leather optical cable on the bottom trough.
7. After confirming that the wire trough cover is tight, use a cloth to wipe away the dirt left during the operation.
4. Cabling through concealed ducts 1. According to the installation position of the equipment (optical splitter, ONU) and the actual layout of the concealed ducts and indoor ducts, find and determine the incoming ducts. The specific location of the household pipe hole.
2. First try to thread the leather optical cable directly into the concealed pipe. If it can be penetrated, the cable threading work is completed and go to step 8.
3. When the cable cannot be threaded directly, a pipe threader should be used.
If the pipe threader has great resistance during the threading process, you can pour an appropriate amount of lubricant into the pipe hole or apply lubricant directly on the pipe threader and try to thread the pipe threader again. into the pipe hole. If it can be penetrated, go to step 6.
4. If the pipe threader cannot be used to penetrate one end, the pipe threader can be used again from the other end. If the pipe threader still fails, a mark should be made on the pipe threader and the pulling line Pull it out, confirm the location of the blockage, report the situation to the user, and re-determine the cable method.
5. When the pipe threader passes through the pipe hole smoothly, connect one end of the pipe threader to the leather optical cable, and make a qualified leather optical cable traction end (the end of the pipe threader traction cable and The ends of the leather optical cables should be wrapped around each other for 20cm and wrapped with insulating tape, but do not wrap it too thickly). If other cables are laid in the same tube hole, lubricant should be used to prevent damage to other cables.
6. Cooperation when pulling the leather optical cable into the pipe is very important. The operation should be carried out by two people. Both parties must shout to each other, such as the signal to start pulling, the command to each other during pulling, and the speed and the status of the leather optical cable, etc.
Since the workers at the pulling end cannot see the workers at the cable unwinding end, they cannot forcefully pull the cables.
7. After pulling the leather optical cable out of the pipe hole, use your hands toCheck with your eyes whether there is any dent or damage on the lead-out section of the sheathed optical cable. If there is damage, abandon the pipe-threading construction method.
8. Confirm the length of the fiber optic cable and cut the fiber optic cable.
Be careful not to cut it too short. The length must be reserved for making the optical fiber mechanical splice plug.
5. Corrugated pipe cabling 1. Select the route for laying the corrugated pipe. The corrugated pipe should be installed out of reach of human hands as much as possible, and should not be installed in a position that damages the appearance. Generally, it is better to use a cable with a small outer diameter. Corrugated pipe less than 25mm.
2. Determine the installation location of the crossing box, and set up the crossing box at the entrance of the residential unit and at the intersection of horizontal and vertical pipes; when the straight section length of the horizontal corrugated pipe exceeds 30m or the section length exceeds 15m and When there are more than two 90° corners, passing boxes should be installed.
3. Install the pipe clamp and fix the corrugated pipe. At the corners of the route or the concave and convex places of the building, the corrugated pipe needs to maintain a certain arc before being installed and fixed to ensure the bending radius of the leather optical cable and facilitate the leather cable. The threading and placement of optical fiber cables.
4. Thread the fiber optic cable in the corrugated tube (a pipe threader can be used when threading the fiber optic cable in the corrugated tube with a long distance).
5. When passing through two straight-line crossing boxes continuously or turning through the crossing box, or pulling the leather optical cable at the home entry point, the leather optical cable should be pulled out of the crossing box before passing through.
6. There is no need to leave any excess length for the covered optical cable in the pass-through box, as long as it meets the bending radius of the covered optical cable.
After the leather optical cable is passed through, you should confirm that the leather optical cable in the bypass box is not squeezed, and pay special attention to the leather optical cable passing through the corner of the bypass box.
7. Close the lid of each passing box.
6. Wall openings and fiber optic cable penetration 1. Determine the location where the fiber optic cable passes through the wall according to the laying route of the fiber optic cable entering the home.
Generally, it is advisable to use existing weak current wall holes to pass optical cables. For buildings without existing wall holes, try to open the wall holes in a concealed and obstacle-free location.
2. Determine the number of covered fiber optic cables that need to be threaded (based on the number of households), and select the size of the wall opening. Generally, a hole with a diameter of 10mm can accommodate 2 covered optical cables.
3. Select the drilling tool (electric drill or impact drill) and drill bit specifications according to the material and hole size of the wall opening.
4. In order to prevent rainwater from pouring in, holes should be drilled from the inner wall to the outer wall at an angle of 10°.
5. After the wall is drilled, in order to ensure the beauty of the drilled hole, a wall sleeve should be inserted into the wall hole or a wall decorative cover should be installed at the wall hole.
6. If the wall hole is larger than expected, it can be repaired with cement. The hole should be as beautiful as possible.
7. Pass the leather optical cable through the hole, and wrap the leather optical cable passing through the wall hole with a winding tube to prevent the leather optical cable from cracking.
8. After the covered optical cable passes through the wall hole, it should be sealed with sealing mud, silica gel and other fillers.Block exterior walls to prevent rainwater from seeping in or insects from crawling in.
9. There should be a certain arc at both ends of the covered optical cable passing through the wall to ensure the bending radius of the covered optical cable.
