Hardware Installation and Reference Guide Appendix
45
Note
2.5GBASE-T is applied to transmit CAT5e UTP. The maximum transmission distance will be less than 50 m
(164.04 ft) when CAT5e UTP unshielded wire is exposed in severe condition and influenced by external crosstalk.
If CAT5e UTP wire is applied in the cabling of the equipment room, the cabling must meet TIA TSB-5021
requirements. And the recommended cabling rules are as follows:
(1) Avoid mixed cabling with other cables, or use metal clapboard in the trunking to isolate different wires.
(2) The CAT5e UTP cabling whose binding length is within 50 m (164.04 ft) can meet the minimum performance
requirements of 2.5GBASE-T standard.
(3) At the outlet end of the device, place the wire separately and ensure parallel cabling. Most of the crosstalks
happen within the 25 m (82.02 ft) started from the outlet end of the device, so it is suggested not to bind up the
wires within the first 5 m to 25 m (82.02 ft) .
(4) When the wires need to be bound, bind CAT5e UTP unshielded wire every 120cm to 180cm (47.24 in. to
70.87 in.) as loosely as possible.
(5) The suggested number of wires in a bundle is not more than 7.
(6) CAT5e wire connector is replaced with CAT6A wire connector.
1000BASE-T
The 1000BASE-T complies with IEEE 802.3ab standard, and uses up to 100 m of 100-ohm CAT5, CAT 5e or
twisted pairs with higher standard. The 1000BASE-T port uses four pairs of wires for transmission, all of which
must be connected. Figure 7-1 shows the connection of the twisted pairs used by the 1000BASE-T port:
Figure 7-1 1000BASE-T Connection
100BASE-TX
In addition to the above cables, the 100BASE-TX can use up to 100m of 100-ohm CAT5. Table 7-2 shows the
definition of pin signal concerning the 100BASE-TX:
Table 7-2 Definition of pin signal concerning the 100BASE-TX
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