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FL SWITCH SFN…
As an example, if a total of four switches are connected
together, there will be a first switch then three additional
switched segments. This means that three times the
overhead value must be used.
Example 2
To take advantage of the bandwidth not used in example 1,
assume one of the cameras is now required to operate at
12 bits per pixel .
4.
Add all the application traffic (step 2.) with all the over
head values (step 3.) and compare with the total
available bandwidth.
The increased camera color depth increases the traffic load
to a total of 639 Mbps . Combined with the 360 Mbps
overhead with a 9000-byte frame size, the total bandwidth is
Example 1
Assuming gigabit devices are used with 9000-byte jumbo
frames and a total of three cascaded switches. Each switch
has one 8 bit/pixel camera plus 10 Mbps of miscellaneous
traffic from other ports.
Figure 14 depicts an example with three cameras
999 Mbps . While technically within the capability of a
1000 Mb switch, any additional traffic across the
transmission line could result in frame loss.
1
2
3
4
connected to individual switches. Each camera is
P
o
w
e r E
T 1 1 0
d
g
e
configured for an 8 bits per pixel color depth, creating a
load of 182 Mbps per camera (see Table 2) with a total
HP LP 2065
_
a u to
+
input
traffic load of 546 Mbps . Frame size is configured to 9000
bytes creating an overhead of 180 Mbps (see Figure 13) for
each cascading switch for a total of 360 Mbps .
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
160 Mbps
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
160 Mbps
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
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/
ACT
X1
100
ACT
X2
100
ACT
X1
100
ACT
X2
100
ACT
X1
100
ACT
X2
100
LNK
/
LNK
/
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/
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/
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/
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/
ACT
X 3
100
ACT
X4
100
ACT
X 3
100
ACT
X4
100
ACT
X 3
100
ACT
X4
100
LNK
/
LNK
/
LNK
/
LNK
/
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/
LNK
/
ACT
X5
100
ACT
X6
100
ACT
X5
100
ACT
X6
100
ACT
X5
100
ACT
X6
100
LNK
/
LNK
/
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/
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/
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/
LNK
/
1
2
3
4
ACT
X7
100
ACT
X 8
100
ACT
X7
100
ACT
X 8
100
ACT
X7
100
ACT
X 8
100
P
o
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e r E
d
g
e
T 1 1 0
HP LP 2065
_
a u o t
+
input
182 Mbps
182 Mbps
275 Mbps
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
180 Mbps
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
180 Mbps
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
Figure 15
8000-byte frame size example
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ACT
X1
100
ACT
X2
100
ACT
X1
100
ACT
X2
100
ACT
X1
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ACT
X2
100
/
LNK
ACT
X 3
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/
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ACT
X5
100
/
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ACT
X7
100
/
LNK
ACT
X4
100
/
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ACT
X6
100
/
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ACT
X 8
100
/
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ACT
X 3
100
/
LNK
ACT
X5
100
/
LNK
ACT
X7
100
/
LNK
ACT
X4
100
/
LNK
ACT
X6
100
/
LNK
ACT
X 8
100
/
LNK
ACT
X 3
100
/
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ACT
X5
100
/
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ACT
X7
100
/
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ACT
X4
100
/
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ACT
X6
100
/
LNK
ACT
X 8
100
One possible solution is to change the frame size to
8000 bytes, reducing the overhead (see Figure 15). The
reduced frame size results in a total overhead of 320 Mbps .
Combined with the camera traffic load, the resulting
bandwidth requirement is 959 Mbps , allowing some space
for additional traffic.
182 Mbps
182 Mbps
182 Mbps
Figure 14
9000-byte frame size example
Adding the camera data and overhead together indicates a
total traffic load of 906 Mbps , leaving 94 Mbps of the
1000 Mbps total unused.
2732_en_D
PHOENIX CONTACT GmbH & Co. KG ? 32823 Blomberg ? Germany ? Phone: +49-(0) 5235-3-00
PHOENIX CONTACT ? P.O.Box 4100 ? Harrisburg ? PA 17111-0100 ? USA ? Phone: +717-944-1300
www.phoenixcontact.com
13
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