2891097 Phoenix Contact, 2891097 Datasheet - Page 12

• 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

9
Certain revisions of the FL SWITCH SFN…GT… switches
have the ability to support jumbo frames. Table 1 shows the
minimum version code (V/C) and hardware code (H/C) that
provides jumbo frame support:
Table 1
A jumbo frame is an Ethernet packet (or frame) which has a
size greater than the IEEE standard 1518 bytes. Jumbo
frames are technically defined as 9000 bytes or less, but
commercial use of the term has been applied to packet
sizes over 9000 bytes. Jumbo frames are used to reduce
network loading when transferring large data files. Fewer
but larger packets, containing fewer overall overhead bytes,
increase the overall network efficiency.
9.1
FL SWITCH SFN…GT… switches support jumbo frames
up to 9600 bytes per frame. In addition, the jumbo frames
can be used with both 100 Mbps and 1000 Mbps
communication. An FL SWITCH SFN…GT… switch has an
Ethernet packet (frame) buffer memory capacity of 16 kB
per port. This memory capacity is especially important when
data is fed through cascaded switches that make up a
network backbone.
9.2
The switch’s frame buffer size, the size of the frames
(bytes/frame) and overall traffic loading of the network
(bandwidth) impact the overall application performance. In
the following sections, the loading per port is compared with
the maximum frame size. At packet (frame) sizes over
3000 bytes, the switch will start sending pause frames to
control the traffic flow (see vertical line on Figure 11 and
Figure 12). As the size of the frame increases, the sending
of pause frames increases. Figure 11 and Figure 12
indicate the maximum loading per port that can occur (for
2732_en_A
Type Code
FL SWITCH SFN 8GT
FL SWITCH SFN 7GT/SX
FL SWITCH SFN 6GT/2SX
FL SWITCH SFN 6GT/2LX
FL SWITCH SFN 6GT/2LX-20
FL SWITCH SFN…GT… Jumbo
Frame Support
FL SWITCH SFN…GT… Jumbo Frame
Capability
Jumbo Frame Performance Factors
Version codes are displayed on the package label
and Hardware Codes are displayed on the
product label.
Jumbo Frame Support Firmware
Version
Code
02
03
02
02
01
Hardware
Code
12
13
12
12
11
each jumbo frame size) until the buffer is overloaded and
packets start to be dropped.
9.3
The use of jumbo frames in industrial applications typically
falls into two major application classes:
–
–
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
packets.
Figure 11
1000
800
600
400
200
0
Bidirectional data transfers: usually caused by larger
data file exchanges between controllers or PC
applications. These may use jumbo frames in both
directions (read/write) between the industrial devices.
Unidirectional data transfer: typically found in networks
where security cameras or vision inspection equipment
feed back to a centralized monitoring station. In these
cases, the vast majority of the traffic flows in one
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.
2000
Application Guidelines
Figure 11, Figure 12, and Figure 13 display traffic
loading for 1000 Mbps (gigabit) data rates. For
100 Mbps data rates divide the y axis numbers
by 10.
Maximum bidirectional traffic loading per port
(FL SWITCH SFN 8GT)
3000
Maximum loading
Pause frame threshold
4000
Frame size (bytes)
5000
6000
7000
PHOENIX CONTACT
FL SWITCH SFN…
8000
9000
9600
12