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FL SWITCH SFN…
direction, i.e., security images from a camera to the
network, with only a few, normal size transmissions
containing control commands going the opposite
direction.
Bidirectional data transfer guidelines
When using jumbo frames for bidirectional data transfers,
the generation of pause frames starts at 3000-byte size
frames. Traffic loadings of near 100% are possible with
frame sizes up to 7000 bytes. Above 7000 bytes the percent
traffic loading has to be reduced to prevent dropped
and pause frame traffic for each link between cascaded
switches.
200
1 8 0
160
140
120
100
8 0
60
40
20
0
packets.
2000
3 000
4000
5000
6000
7000
8 000
9000
Frame size (bytes)
1000
Figure 13
Overhead/cascaded switch vs. frame size
8 00
9.4
Calculating Total Network loading with
600
400
200
cascaded (trunk topology) switches
Because of the buffer size considerations when using jumbo
frames, network bandwidth loading should be planned in
advance to prevent packet loss.
0
2000
3 000
4000
5000
6000
7000
8 000
9000
9600
1. Determine the total application traffic load for the
Frame size (bytes)
Maximum loading
Pause frame threshold
connected devices.
Add all the traffic loads from each device that will be
connected to the switch and transferred to the main
Figure 11
Maximum bidirectional traffic loading per port
(FL SWITCH SFN 8GT)
trunk line. When using cameras or vision systems, the
bandwidth usage per device can be high (see Table 2).
Actual numbers may vary depending on the camera or
Unidirectional data transfer guidelines
device type used.
Table 2 Typical bandwidth load
In applications where the data flow is predominantly in one
direction, such as cameras and vision systems, near 100%
loading is possible using jumbo frames.
1000
900
8 00
700
600
500
Typical Camera
Settings
60 frames per
second
750 x 640 pixels
per frame
Color Depth
(bits/pixel)
8
12
16
24
32
Typical Traffic
Load (Mbps)
182
275
366
550
732
400
3 00
200
100
2.
Add all the application traffic from all connected
switches and compare to the maximum network
capacity.
0
2000
3 000
4000
5000
6000
7000
8 000
9000
9600
As the trunk traffic passes from switch to switch, add the
Frame size (bytes)
Maximum loading
Pause frame threshold
total application device traffic from all the switches. The
traffic load on the trunk ports cannot be greater than the
total bandwidth available (1000 Mbps for gigabit and
100 Mbps for Fast Ethernet ports).
Figure 12
Maximum unidirectional traffic loading per port
(FL SWITCH SFN 8GT)
3.
Determine the traffic load for bandwidth consumed by
application overhead and pause frames (see
Figure 13). After the first switch, add this amount for
When cascading devices in a trunk topology, up to 18 Mbps
of the available bandwidth is required to support overhead
each additional switch segment.
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