Allied Telesis AT-3714FXL - Manual (Page 32)

Troubleshooting
3-2
Network Cabling Problems
If you have 100Base-TX (Fast Ethernet), some network problems may
be related to exceeding cabling distances. Refer to the standard IEEE
802.3u, Clause 29.3.1.2 on Worst Case Path Delay Value. This
document specifies that the collision domain diameter must be
within the following limits:
# Under 330 ft (100 m) for TX cabling
# Under 1331.56 ft (412 m) for half-duplex FX cabling