Last Updated：2022/12/24
In this additional spectrum, in-band signaling was sent down the wires outside the frequencies used for conversation. Actually, the signals were sent across the 3,500- and 3,700-Hz frequencies. Although these worked and were not in the talk path (out of the band) they were limited in the number of tones that could be sent.
音声機能が動作しない場合はこちらをご確認ください
Edit Histories（0）
Source Sentence
In
this
additional
spectrum,
in-band
signaling
was
sent
down
the
wires
outside
the
frequencies
used
for
conversation.
Actually,
the
signals
were
sent
across
the
3,500-
and
3,700-Hz
frequencies.
Although
these
worked
and
were
not
in
the
talk
path
(out
of
the
band)
they
were
limited
in
the
number
of
tones
that
could
be
sent.
