Background Zone Usage Measurement

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1 background

1.1 rural
1.2 urban
1.3 local toll





background

local access , transport areas (lata) created after breakup of bell system. called service areas, or local toll calling areas. california, example, divided 11 service areas. calls made places within same service area break down follows:


rural

local calls: 0–12 miles
local toll: 13+ miles (within service area)

urban

local calls: 0–12 miles
zone usage measurement (zum), or zone 3: 13–16 miles

local toll

17+ miles (within service area)


calls within each area, 12 miles, local calls. in metropolitan areas, calls between 13 , 16 miles zone usage measurement (zum) zone 3 calls. other calls within each service area referred local toll calls. in non-zum areas local toll calls start @ 13 miles.







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