§76.609. Measurements. — Inbound Citations

(1) Any signal that was permitted (or, in the case of cable systems commencing operations after June 24, 1981, that would have been permitted) under the rules and regulations of the Federal Communications Commission in effect on June 24, 1981 (former 47 CFR 76.1 through 76.617 (1980)); or

(e) Prior to providing service to any subscriber on a new section of cable plant, the operator shall show compliance with either:

(1) The basic signal leakage criteria in accordance with paragraphs (a)(1) or (2) of this section for the entire plant in operation or

(2) a showing shall be made indicating that no individual leak in the new section of the plant exceeds 20 µV/m at 3 meters in accordance with § 76.609 for analog signals or 17.4 µV/m at 3 meters for digital signals.

(1) Prior to carriage of signals in the aeronautical radio bands and at least once each calendar year, with no more than 12 months between successive tests thereafter, based on a sampling of at least 75% of the cable strand, and including any portion of the cable system which are known to have or can reasonably be expected to have less leakage integrity than the average of the system, the cable operator demonstrates compliance with a cumulative signal leakage index by showing that 10 log I∞ is equal to or less than 64 using the following formula:

θ is the fraction of the system cable length actually examined for leakage sources and is equal to the strand kilometers (strand miles) of plant tested divided by the total strand kilometers (strand miles) in the plant;

Ei is the electric field strength in microvolts per meter (µV/m) measured 3 meters from the leak i; and

n is the number of leaks found of field strength equal to or greater than 50 µV/m measured pursuant to § 76.609(h).

The sum is carried over all leaks i detected in the cable examined; or