Allied Telesis CentreCOM AT-MR415T Installation Manual page 27

Regardless of your current network configuration, the maximum
number of AT-MR415T/AT-MR815T Micro Repeaters which can be
cascaded together is four.
Before expanding a network through a T-port, consult the network
administrator. Be sure that the expansion will not exceed the limit defined by
the current LAN configuration before proceeding. See Figure 9.
AT-MR415T and AT-MR815T Installation Guide
Note
Figure 9: LAN Connectivity
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