Hz with -3 to +12 range 1000 Hz tone loss -16, 1% in either direction 3) Signal to noise ratio 24 Db level 4) White noise C message Dbrnco 5) Envelope delay measurement 6) Phase jitter not to exceed 10% 7) Impulse noise test minimum 15 minute count Don't worry if you do not understand what all these tests mean, the telephone company knows. These standards are all available from the
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