2891097 Phoenix Contact, 2891097 Datasheet - Page 14
![SWITCH ETHERNET 7/RJ45-SC F/OPT](/photos/27/90/279024/mfg_2891097_sml.jpg)
2891097
Manufacturer Part Number
2891097
Description
SWITCH ETHERNET 7/RJ45-SC F/OPT
Manufacturer
Phoenix Contact
Type
Ethernetr
Specifications of 2891097
Features
7 Ports
Product
Switches
Usoc Codes
RJ45
Number Of Ports
7, 1
Gender
Female
Shielding
Shielded
Current Rating
190 mA
Voltage Rating
24 V
Housing Material
Aluminum
Contact Material
Copper Alloy
Contact Type
RJ45, Fiber Optic
Number Of Rows
2
Operating Temperature Range
0 C to + 60 C
Phoenix Part Number
FL SWITCH SFN 7TX/FX
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
connected to individual switches. Each camera is
configured for an 8 bits per pixel color depth, creating a
load of 182 Mbps per camera (see Table 2) with a total
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.
Figure 14
Adding the camera data and overhead together indicates a
total traffic load of 906 Mbps, leaving 94 Mbps of the
1000 Mbps total unused.
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.
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
999 Mbps. While technically within the capability of a
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182 Mbps
9000-byte frame size example
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FL SWITCH SFN 8TX
Ord.-No.: 2891929
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180 Mbps
PHOENIX CONTACT • P.O.Box 4100 • Harrisburg • PA 17111-0100 • USA • Phone: +717-944-1300
PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany • Phone: +49-(0) 5235-3-00
182 Mbps
H P LP 2065
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a u t o
+
i n put
FL SWITCH SFN 8TX
Ord.-No.: 2891929
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180 Mbps
182 Mbps
X1
X3
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X7
www.phoenixcontact.com
FL SWITCH SFN 8TX
Ord.-No.: 2891929
X2
X4
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1000 Mb switch, any additional traffic across the
transmission line could result in frame loss.
Figure 15
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
8000-byte frame size example
X3
1
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FL SWITCH SFN 8TX
Ord.-No.: 2891929
X4
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X2
160 Mbps
182 Mbps
H P LP 2065
X3
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X7
X1
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a u t o
+
i n put
FL SWITCH SFN 8TX
Ord.-No.: 2891929
X2
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160 Mbps
FL SWITCH SFN…
275 Mbps
X1
X3
X5
X7
FL SWITCH SFN 8TX
Ord.-No.: 2891929
X2
X4
X6
X8
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