SMC Networks SMC-EZ109DT - Manual (Page 27)

C
ABLES
15
Adjusting Existing Category 5 Cabling to Run
1000BASE-T
If your existing Category 5 installation does not meet one of the
test parameters for 1000BASE-T, there are basically three measures
that can be applied to try and correct the problem:
1. Replace any Category 5 patch cables with high-performance
Category 5e cables.
2. Reduce the number of connectors used in the link.
3. Reconnect some of the connectors in the link.