Block architecture of the SCALANCE XR-300M PoE
The XR‑300M PoE handles the Ethernet frame traffic of the 24 ports with the aid of three switch
blocks.
• The three switch blocks are connected in series (block 1 via block 2 to block 3).
• Gigabit wire speed is possible within a block (max. 8 ports per block).
• Between the blocks there is a bandwidth of 1 gigabit/s available,that must be shared by all
ports for frame traffic between the blocks.
When operating solely with Fast Ethernet (100 Mbps), the XR devices support full wire speed via
all blocks.
P1
P2
P3
P4
P5
P6
P7
P8
1
P1
P2
2
P1
P2
P9
P10
P11
P12
P13
P14
P15
P16
3
P1
P2
4
P1
P2
1
2
3
1 Gbit/s
1 Gbit/s
Figure 8-1
Block architecture of the XR324‑4M
8.4
Other properties
Switching properties
Max. number of learnable addresses
8000
Aging time
30 sec
Switching technique
Store and forward
Latency
5 μs
Reconfiguration times for redundancy mechanisms
Redundancy mechanism
Reconfiguration times
HRP
300 ms
Standby link
300 ms
MRP
200 ms
Technical specifications
8.4 Other properties
SCALANCE XR-300M PoE
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Compact Operating Instructions, 03/2022, A5E02661178-15