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FL SWITCH SFN…
and 7 are considered high priority and processed
before packets with a priority level between 0 and 3.
After prioritization the packets are forwarded without
modification.
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,
8
Dimensions
14 mm
FL S WITCH S FN 5TX
Ord.-No.: 2 8 91152
FL S WITCH S FN 8 TX
Ord.-No.: 2 8 91929
U S
increase the overall network efficiency.
Version codes are displayed on the package label
and Hardware Codes are displayed on the
product label.
K/
AC
K/
AC
K/
AC
LN
T
LN
T
LN
T
9.1
FL SWITCH SFN…GT… Jumbo Frame
Capability
X1
X1
X2
100
100
100
FL SWITCH SFN…GT… switches support jumbo frames
up to 9600 bytes per frame. In addition, the jumbo frames
K/
AC
K/
AC
K/
AC
K/
AC
K/
AC
K/
AC
K/
AC
K/
AC
K/
AC
LN
T
X2
100
LN
T
X 3
100
LN
T
X4
100
120 mm
LN
T
X 3
100
LN
T
X5
100
LN
T
X7
100
LN
T
X4
100
LN
T
X6
100
LN
T
X 8
100
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
Jumbo Frame Performance Factors
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
LNK/ACT
100
X5
the maximum frame size. At packet (frame) sizes over
3000 bytes, the switch will start sending pause frames to
3 0 mm
Figure 10
Housing dimensions
50 mm
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
each jumbo frame size) until the buffer is overloaded and
9
FL SWITCH SFN…GT… Jumbo
Frame Support
packets start to be dropped.
Figure 11, Figure 12, and Figure 13 display traffic
loading for 1000 Mbps (gigabit) data rates. For
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
100 Mbps data rates divide the y axis numbers
by 10.
provides jumbo frame support:
9.3
Application Guidelines
Table 1
Jumbo Frame Support Firmware
The use of jumbo frames in industrial applications typically
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
Version
Code
02
03
02
02
01
Hardware
Code
12
13
12
12
11
falls into two major application classes:
– 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
A jumbo frame is an Ethernet packet (or frame) which has a
size greater than the IEEE standard 1518 bytes. Jumbo
cases, the vast majority of the traffic flows in one
2732_en_D
PHOENIX CONTACT
11
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