1. The power in the band from 3,995 hertz to 4,000 hertz shall
be at least 19 dB below the power of the signal as specified in Subsection
a. preceding.
2. The power in the band from 4,000 hertz to 10,000 hertz shall not
exceed 24 dB below one milliwatt.
3. The power in the band from 10,000 hertz to 25,000 hertz shall not
exceed 24dB below one milliwatt.
4. The power in the band from 25,000 hertz to 40,000 hertz shall not
exceed 36 dB below one milliwatt.
5. The power in the band above 40,000 hertz shall not exceed 50 dB below
one milliwatt.
c. Where there is connection via Customer-provided terminal equipment or
communications systems to a Message Telecommunications Service to prevent
the interruption or disconnection of calls or interference with network
control signaling, it is necessary that the equipment to the interface
at no time has energy solely in the 2450 to 2740 hertz band. If signal
power is in the 2450 to 2750 hertz band, it must not exceed the power present
at the same time in the 800 to 2450 hertz band.
d. Where such Customer-provided equipment or communications system applies,
signals having components in the frequency spectrum below 300 hertz, excluding
ringing signals, the currents and voltages (including all harmonics and
spurious signals) at the interface shall not exceed the limits indicated
in 1. through 4. following: