3com 5101T-FB-ST User Manual

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Also, ensure that you have accounted for the
distance reduction caused by external baseband 
repeaters that were added and by baseband
segments connected to those repeaters.
Miscellaneous Errors
Many types of physical layer errors can occur if 
the controller AUI interface is Ethernet Version 
1.0 or not fully compliant with Version 2.0 and 
IEEE 802.3.
If errors occur:
1.
Try switching between the Full Step and Half 
Step options on the 10BASE-FB Transceiver.
2.
Verify that an IEEE 802.3 AUI cable is being 
used with 802.3 controllers
3.
Verify that Ethernet V2.0 cables are being 
used with Ethernet V2.0 controllers.
Refer to the next section for more information 
on AUI cables.