NOTE!
If a microphone is powered by the signal cable, which does not
affect signal transmission, the power supply mode is called phantom
power supply and the microphone is a feedback microphone.
Local
Cache
Function
z
The
capacity
of
the
USB
storage
device
must
be
at
least
4
GB.
z
The
USB
port
of
the
storage
device
must
be
of
USB
2.0
or
later
versions.
z
The
file
system
of
the
USB
storage
device
uses
FAT32
and
can
have
only
one
partition.
CAUTION!
z
If
the
local
cache
function
is
used,
caching
data
at
a
high
bit
rate
is
not
recommended.
In
addition,
the
cache
writing
rate
must
be
lower
than
the
maximum
writing
rate
of
the
USB
storage
device
to
avoid
cache
errors.
z
Hot
plugging
is
not
recommended
after
you
insert
a
USB
storage
device
into
the
device.
If
you
pull
out
the
USB
storage
device
by
accident,
you
need
to
restart
the
device;
otherwise,
the
cache
function
will
fail.
z
Do
not
manually
delete
any
video
file
or
folder
stored
in
the
USB
storage
device,
or
manually
copy
any
file
to
the
USB
storage
device.
If
you
need
to
use
the
local
cache
function,
ensure
that
the
USB
storage
device
to
be
inserted
has
been
formatted,
because
the
terminal
device
does
not
support
USB
formatting.
After
you
insert
the
USB
device,
the
local
cache
function
will
automatically
start
about
15
seconds
later
following
a
central
storage
failure.
Cached
files
will
be
periodically
overwritten.
Therefore,
export
cached
files
in
time
using
the
FTP
client
or
start
the
image
uploading
function
to
8
