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Restrictions on the Number of
Distributions for VN-V25U/26U
The maximum number of distributions for
VN-V25U/26U is determined by the settings as
well as requirements from the client.
When only JPEG images are distributed, the
maximum number of distributions is determined
based on the highest bit rate within the stream.
When a distribution request that exceeds the
maximum number of distributions is received,
this request is denied. For example, if Client A
requests for and receives data at 1 Mbps, while
Client B requests for and receives data at
5 Mbps, the maximum number of distributions is
4 streams according to the table below.
Maximum number of distributions when only
JPEG data is distributed
When only MPEG4 images are distributed, the
maximum number of distributions is determined
by the preset bit rate. When a distribution
request that exceeds the maximum number of
distributions is received, this request is denied.
When distributing only MPEG4 data
When both JPEG and MPEG4 images are
distributed simultaneously, distribution up to two
clients for JPEG and MPEG4 respectively is
possible. However, distribution requests that
exceed a total bit rate of 20 Mbps will be denied.
Insufficient network bandwidth
When there is insufficient bandwidth, the
number of JPEG frames (frame rate) that the
client can acquire will decrease. Delay will also
occur in the distribution of images. In the case of
MPEG4, noise interference may occur and
playback may fail.
There may be a longer delay or interruption in
the audio.
Network Delay
When the client acquires JPEG via TCP,
VN-V25U/26U will send out data while checking
the ACK from the client at the same time. For
networks with considerable delay, data cannot
be sent out until ACK is received, and therefore
the frame rate will drop. In the case of MPEG4,
noise interference may occur and playback may
fail.
Audio may be interrupted.
Decrease in the frame rate due to network delays
can be eliminated by receiving data via multicast.
Network Jitter
When there is considerable network jitter, delay
time may be prolonged and the image frame rate
may drop. In the case of MPEG4, noise
interference may occur and playback may fail.
Audio may be interrupted.
Packet Loss
When acquiring images from VN-V25U/26U via
TCP, packet loss may be recovered by TCP
transmission. When there is considerable delay
in the network, however, missing data may occur
and the image frame rate may drop. In the case
of MPEG4, noise interference may occur and
playback may fail.
Audio may be interrupted.
When packet loss occurs during multicast
sending from VN-V25U/26U, the image frame
rate may drop. In the case of MPEG4, noise
interference may occur and playback may fail.
Audio may be interrupted.
Distribution
at maximum
bit rate
Maximum
number of
distributions
Total
maximum bit
rate
1 Mbps and
below
20 20 Mbps
5 Mbps and
below
4 20 Mbps
10 Mbps and
below
2 20 Mbps
Larger than
10 Mbps
1 Maximum
configurable
value
(24 Mbps)
Preset bit
rate
Maximum
number of
distributions
Total
maximum bit
rate
0.6 Mbps
and below
20 12 Mbps
3 Mbps and
below
4 12 Mbps
6 Mbps and
below
2 12 Mbps
Larger than
6 Mbps
1 Maximum
configurable
value (8
Mbps)
Total bit
rate
Maximum
number of
distributions
for JPEG
Maximum
number of
distributions
for MPEG4
20 Mbps and
below
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VN-V25U_26U_EN.book Page 25 Friday, January 18, 2008 2:56 PM