The key variance between how the two wiring configurations described are in the way that the pair numbers three and four are situated or placed.
<h3>What is
Service Order Codes (USOC)?</h3>
The above refers to a system of specifications that was created by Bell Systems company to enable the connection of equipment used in buildings both in homes and in public places.
The ANSI/TIA/EIA 570-B on the other hand is the standard that the cabling for telecommunications must meet.
Hence, the primary variance between how the configuration or settings of the wiring for a residential, 8-position, 8-contact (8P8C) modular plug and jack in the Universal Service Order Codes (USOC) and ANSI/TIA/EIA 570-B is in the way that the pair numbers three and four are situated or placed.
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