Siemens SCALANCE X-300 Series Compact Operating Instructions page 68

Technical data
7.4 Other properties
At 100 Mbps
9615
8127
Note
The following applies to IE Switches X-300:
The number of IE Switches X-300 connected in a line influences the frame delay time. When
a frame passes through the switch, this is delayed by the Store&Forward function of the
IE Switch X-300 by the following values:
● at 64 bytes frame length: Delay of approx. 10 microseconds (at 100 Mbps)
● at 1500 bytes frame length: Delay of approx. 130 microseconds
(at 100 Mbps)
This means, the more IE Switches X-300 a frame runs through, the higher the frame delay.
PRP compatibility
Device variant
X304-2FE
X306-1LD FE
X307-3
X307-3LD
X308-2
X308-2LD
X308-2LH
X308-2LH+
X310
X310FE
X320-1 FE
X320-3LD FE
* Information about the firmware version (V) as of which PRP is supported.
Note
For a device to be used in PRP networks, it must be able to process a frame length of at least
1528 bytes (Jumbo Frames). This value is the maximum frame length including VLAN tag of
1522 bytes plus the length of the PRP trailer of 6 bytes. The following table shows the version
as of which the devices are PRP-compatible.
68
Number of frames per second
At 1000 Mbps
96154
81274
At a frame length of
1280 bytes
1518 bytes
As of version *
V3.7.0
Compact Operating Instructions, 11/2019, A5E00982643-18
SCALANCE X-300