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Using the Centillion EtherSpeedII Switch Modules
B-6 207344-B
Pin 1 crosses to pin 3, and pin 2 crosses to pin 6. To build this cable, you must
cross pairs. The pairs are listed in Table B-4
, with an example of the color
combinations found in two typical cables.
Using Category 5 Unshielded Twisted Pair Cables
Unshielded twisted pair (UTP) cable is the recommended wiring option for
100BASE-TX Fast Ethernet, as specified in the IEEE 802.3 standard for Ethernet.
Fast Ethernet recommended UTP cable consists of four pairs of twisted insulated
copper conductors bound in a single plastic sheath. The 100BASE-TX Fast
Ethernet transmissions are implemented through two-pair or four-pair Category 5
UTP wiring using standard shielded RJ-45 connectors. Category 5 cable is
certified to handle up to 100 MHz bandwidth. The EIA/TIA T568A standard
recommends the installation of Category 5 UTP cable for 100 Mb/s networks.
Use the following guidelines to ensure that your cables perform to specifications:
• Certification—Make sure that your Category 5 UTP cable has completed the
Underwriters Laboratories (UL) or Electronic Testing Laboratories (ETL)
certification process.
• Terminating method—To minimize crosstalk noise, maintain the twist ratio of
the cable up to the point of termination (untwist at any termination should not
exceed 0.5 in.).
• Pairing options—For optimal performance from your cable plant, use the
EIA-T568A Commercial Building Wiring Standard pairing option at each end
of the cable. The terminating hardware offered by most major manufacturers
is correctly color-coded for proper wire placement according to that standard.
Table B-4. Pairs in an RJ-45 Crossover Cable
Pairs
Example 1
Color Combinations
Example 2
Color Combinations
1 and 2 Orange/white and white/orange Orange and blue
3 and 6 Green/white and white/green Yellow and black
4 and 5 Blue/white and white/blue Red and green
7 and 8 Brown/white and white/brown Brown and gray