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What is the difference between a straight-through Ethernet cable, and a crossover Ethernet cable?

Patch cables can come in two different wiring applications: straight-through and crossover. The type of cable that is required depends on the application. Straight-through Ethernet cables are the most commonly used.

Cable type Typical application
Straight-through
  • Between a computer and a modem, router, or switch
  • CAT5/CAT6 peripheral extenders
  • Between other dissimilar networking equipment
Crossover
  • Between two computers
  • Between two similar networking devices

Crossover cables use two different wiring standards: one end uses the T568A wiring standard, and the other end uses the T568B wiring standard. To determine if you have a straight-through or crossover cable, compare the Ethernet cables to see if the colors are wired in the same order on each end. For more information on Ethernet wiring standards, refer to the following FAQ: http://www.startech.com/faq/network_cables_a_vs_b_pinout.

Many modern network devices support Auto MDI-X, which automatically negotiates which wiring standard is required. For example, a computer with Auto MDI-X can use either a straight-through or crossover cable for any application.

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This FAQ applies to these products:
45PAT1MBK 45PAT1MBL 45PAT1MGR 45PAT1MOR 45PAT1MRD 45PAT1MWH 45PAT1MYL 45PAT2MBK 45PAT2MBL 45PAT2MGN 45PAT2MGR 45PAT2MRD 45PAT2MWH 45PAT3MBK 45PAT3MBL 45PAT3MGR 45PAT3MWH 45PAT5MBK 45PAT5MBL 45PAT5MGR 45PATCH15GR 45PATCH25GR C6ASPAT10AQ C6ASPAT10BK C6ASPAT12AQ C6ASPAT12BK C6ASPAT12GR C6ASPAT14BK C6ASPAT15AQ C6ASPAT15BK C6ASPAT15BL C6ASPAT15GR C6ASPAT1AQ C6ASPAT1BK C6ASPAT20AQ C6ASPAT20BK C6ASPAT20BL C6ASPAT20GR C6ASPAT25AQ C6ASPAT25GR C6ASPAT2AQ C6ASPAT2BK C6ASPAT2BL C6ASPAT2GR C6ASPAT30AQ C6ASPAT30BK C6ASPAT30BL C6ASPAT30GR C6ASPAT35AQ C6ASPAT35BK C6ASPAT35GR C6ASPAT3AQ C6ASPAT3BK C6ASPAT4AQ C6ASPAT4BK C6ASPAT4BL C6ASPAT4GR C6ASPAT5AQ C6ASPAT5BK C6ASPAT5BL C6ASPAT6AQ C6ASPAT6BK C6ASPAT6BL C6ASPAT6GR C6ASPAT6INAQ C6ASPAT6INBK C6ASPAT6INBL C6ASPAT7AQ C6ASPAT7BK C6ASPAT8AQ C6ASPAT8BK C6ASPAT8BL C6ASPAT8GR C6ASPAT9GR C6CROSS1MYL C6CROSSOVER C6PATCH100OR C6PATCH100RD C6PATCH10BK C6PATCH10BL C6PATCH10GR C6PATCH10PL C6PATCH15BK C6PATCH15BL C6PATCH15OR C6PATCH15PL C6PATCH1BL C6PATCH20OR C6PATCH20PL C6PATCH25OR C6PATCH25PL C6PATCH2BL C6PATCH35GN C6PATCH35OR C6PATCH3BK C6PATCH3BL C6PATCH3GR C6PATCH3RD C6PATCH3WH C6PATCH3YL C6PATCH50BL C6PATCH50OR C6PATCH50PL C6PATCH50RD C6PATCH6BK C6PATCH6BL C6PATCH6OR C6PATCH6PL C6PATCH75BL C6PATCH75GR C6PATCH7BL CRJ4550PK CRJ45C6STR50 M45PATCH10BK M45PATCH10BL M45PATCH10GR M45PATCH3BL M45PATCH6BK M45PATCH6BL M45PATCH6GR M45PATCH7BL M45PATCH7GR N6PATC10MGN N6PATC10MOR N6PATC10MRD N6PATC10MWH N6PATC10MYL N6PATC7MOR N6PATC7MRD N6PATC7MWH N6PATC7MYL N6PATCH10BK N6PATCH10BL N6PATCH14BK N6PATCH14GN N6PATCH14GR N6PATCH14OR N6PATCH14PL N6PATCH14RD N6PATCH14WH N6PATCH1BK N6PATCH1BL N6PATCH1GN N6PATCH1OR N6PATCH1PL N6PATCH1RD N6PATCH1WH N6PATCH25BK N6PATCH25BL N6PATCH3BL N6PATCH6BL N6PATCH6GR N6PATCH6INBK N6PATCH6INBL N6PATCH6INGN N6PATCH6INOR N6PATCH6INPL N6PATCH6INRD N6PATCH6INWH N6PATCH6OR N6PATCH6PL N6PATCH6RD N6PATCH6WH N6PATCH7BL N6PATCH7GR N6SPAT1MBK N6SPAT2MBK N6SPAT3MBK N6SPAT5MBK RJ45PATCH10 RJ45PATCH6 RJ45PATCH7 WIR5ECMRBK WIR5ECMRWH WIR6CMRBL WIR6CMRGR WIRC5ECMR WIRC5ECMRGRY
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