A: bicsi's tdmm (1996), in Chapter 4--Horizontal Cabling Systems, states: "When cable runs are being installed, consider providing additional slack at both ends--the recommended minimum amount of slack at the telecommunications closet is 3 meters (10 ft) and at the outlet is 1 meter. A: bicsi's tdmm (1996), in Chapter 4--Horizontal Cabling Systems, states: "When cable runs are being installed, consider providing additional slack at both ends--the recommended minimum amount of slack at the telecommunications closet is 3 meters (10 ft) and at the outlet is 1 meter. Service loops are excess cable (slack) that is designed to be in addition to any cable needed for the actual planned drop (run) length and terminations. Service slack is found at both ends of the permanent link in a structured cabling system. bicsi (Tampa, FL), in its 1995 Tele-communications Distribution Methods Manual (tdmm), recommends 1 foot of slack at. bers to be terminated from cable to cable or from cable to pigtail assemblies. There will be roughly 5-15m of cable slack piling. Deploying fiber above ground on poles or towers removes the need for underground digging and is particularly useful when the ground is uneven, rocky or both. Fiber in a duct solutions have a major aesthetic. Those are fiber optic cables that are wound back and forth between those "snowshoe" devices, which are used to limit the bend radius of the fiber. The fiber must have so much slack.