Pike
Technical
Manual
V5.2.3
221
Video formats, modes and bandwidth
Video
formats,
modes
and
bandwidth
Frame rates
An
IEEE1394
camera
requires
bandwidth
to
transport
images.
The
IEEE1394b
bus
has
very
large
bandwidth
of
at
least
62.5
MByte/s
for
transferring
(isochronously)
image
data.
Per
cycle
up
to
8192
bytes
(or
around
2000
quadlets
=
4
bytes@
800
Mbit/s)
can
thus
be
transmitted.
Depending
on
the
video
format
settings
and
the
configured
frame
rate,
the
camera
requires
a
certain
percentage
of
maximum
available
bandwidth.
Clearly
the
bigger
the
image
and
the
higher
the
frame
rate,
the
more
data
is
to
be
transmitted.
The
following
tables
indicate
the
volume
of
data
in
various
formats
and
modes
to
be
sent
within
one
cycle
(125
µs)
at
800
Mbit/s
of
bandwidth.
The
tables
are
divided
into
three
formats:
They
enable
you
to
calculate
the
required
bandwidth
and
to
ascertain
the
number
of
cameras
that
can
be
operated
independently
on
a
bus
and
in
which
mode.
Note
All
bandwidth
data
is
calculated
with:
1
MByte
=
1024
KB
Format
Resolution
Max. Video Format
Format_0
up
to
VGA
640
×
480
Format_1
up
to
XGA
1024
×
768
Format_2
up
to
UXGA
1600
×
1200
Table 100: Overview fixed formats
