Networking and Telecom Pin Assignments

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For your reference, here are descriptions of the most frequently asked for pin assignments.
T568A (RJ45 8P8C - 8-position, 8-conductor jack)
T568B (RJ45 8P8C - 8-position, 8-conductor jack)
Ethernet 10BASE-T and 100Base-TX crossover cord
Ethernet 100Base-T4 crossover cord
Gigabit Ethernet 1000Base-T crossover cord
Token Ring crossover cord
110-type block wiring diagram
Terminating 4-pair cables onto 110-type wiring block
Splitting a 4-pair CAT5E/6 cable between two Ethernet PCs
RJ31X Pin Layout (Fire Alarm and Security Wiring)
RJ38X Pin Layout (Fire Alarm and Security Wiring)
EIA/TIA-561 Pin Layout (serial interface via 8-pin connector)
Splitting a CAT5E (or better) cable to extend two T1/E1 circuits
  
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