Weak current shafts are generally only 0.6 to 1 m square, but they must complete four tasks at the same time: vertical laying of optical cables, fire prevention and sealing, rodent prevention and floor fiber distribution. The two sections that are most likely to leak during acceptance are the opening and the end. Here, the three acceptance points for shaft laying are compiled into one article.

Reserved circle: both diameter and binding are important

When laying vertically in a shaft, a coil ring is usually left at the opening of each layer. The diameter of the ring should not be less than 200 mm. Use Velcro to hang it on the bridge bracket and do not wrap it around the fire pipe or lightning protection downconductor. If the tie is too tight, it will make dents in the armor layer, and if it is loose, it will hang down and block the cabinet door; the starting point and end point of the inventory points must be marked, corresponding to the ODF port record of the computer room, so that there will be clues to check during maintenance.

Fireproof fixing: location determines success or failure

Fire protection clips should be installed at and approximately 1 m below each floor opening, with vertical segments spaced not more than 1 m apart. Before the optical cable passes through the floor, clean the hole wall, and fill the gap between the fireproof bag and the hole wall with fireproof mud. Only half of it is blocked, which means that it is not blocked at all, and the fire protection level is in vain.

Orifice sealing: fire prevention and rodent prevention done in one go

Rats move up and down along the shaft, and their gnawing points are mostly concentrated at the edge of the hole. When blocking, rodent nets should be added outside the fire prevention structure, and then usedSingle mode double core armored jumper or Single mode single core armored patch cordThe sections exposed on the side of the cabinet completely drive ordinary soft jumpers out of the shaft. The light in the shaft is dark and there are few windows for renovation. Rat infestation is often exposed through increased attenuation after several months. By then, the cost of rework is much higher than doing it right the first time.High-tech Park Office Building All-Optical Network FTTH ProjectThe end protection in the hoistway is all in place according to the armoring plan.

The shaft is a difficult position to move after delivery. EB-LINK recommends that the three steps of reserving, fixing, and sealing be done at one time during acceptance, so that later operation and maintenance can be worry-free.