2891411 Phoenix Contact, 2891411 Datasheet - Page 14

• Manufacturer Part Number: 2891411
• Description: SWITCH ETHERNET 6/RJ45-2ST F/OPT
• Manufacturer: Phoenix Contact
• Type: Ethernetr

Specifications of 2891411

• Features: 6 Ports
• Product: Switches
• Usoc Codes: RJ45
• Number Of Ports: 6, 2
• Gender: Female
• Shielding: Shielded
• Current Rating: 230 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
• Brand/series: SFN Series
• Phoenix Part Number: FL SWITCH SFN 6TX/2FX ST
• Primary Type: Switch
• Protocol Type: Ethernet
• Special Features: Auto Negotiation, Store and Forward
• Transmission Speed: 10/100 MBit/s
• 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: [phone]
PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany • Phone: [phone]
182 Mbps
H P LP 2065
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FL SWITCH SFN 8TX
Ord.-No.: 2891929
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180 Mbps
182 Mbps
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www.phoenixcontact.com
FL SWITCH SFN 8TX
Ord.-No.: 2891929
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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
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FL SWITCH SFN 8TX
Ord.-No.: 2891929
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160 Mbps
182 Mbps
H P LP 2065
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FL SWITCH SFN 8TX
Ord.-No.: 2891929
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160 Mbps
FL SWITCH SFN…
275 Mbps
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FL SWITCH SFN 8TX
Ord.-No.: 2891929
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