The Cisco CAB-CONSOLE-RJ45 72-3383-01 6ft RJ45 to DB9F Rollover Console Cables (or management cable) are null modem cables that allow users the ability to communicate and configure a networking device. These particular null modem cables are "rolled over" meaning that on connector A pin 1 connects to pin 8 on connector B, pin 2 to pin 7 respectively and so on. The wiring is exactly opposite on one connector as it is on the other. This wiring allows users to configure various network devices by attaching the DB9 female portion of the cord to the serial port on your computer, and the RJ45 plug into the device (router, firewall, switch etc.). 

The CAB-CONSOLE-RJ45 is compatible with Cisco 2801, 2801 2-pair G.SHDSL bundle, 2801 4-pair G.SHDSL bundle, 2801 ADSL over Basic Telephone Bundle, 2801 Annex M bundle, 2801 DSL Bundle, 2801 HVSEC Bundle, 2801 Unified Communications Bundle, 2801 Unified Communications Bundle with Advanced Security, 2801 Voice Bundle, 2801 Voice Security Bundle, 2801 VSEC Bundle, 2811, 2811 2-pair G.SHDSL bundle, 2811 4-pair G.SHDSL bundle, 2811 Annex M bundle, 2811 DSL bundle, 2811 Enhanced Security Bundle, 2811 HVSEC Bundle, 2811 Secure 3G Bundle, 2811 Unified Communications Bundle, 2811 Unified Communications Bundle with Advanced Security, 2811 V3PN Bundle, 2811 Voice Bundle, 2811 Voice Security Bundle, 2811 VSEC Bundle, 2811 WAN Application Acceleration Bundle, 2821, 2821 4-pair G.SHDSL bundle, 2821 Branch Office in a Box Bundle, 2821 HVSEC Bundle, 2821 Secure WAN Optimization Bundle, 2821 Security Bundle, 2821 Unified Communications Bundle, 2821 Unified Communications Bundle with Advanced Security, 2821 V3PN Bundle, 2821 Voice Bundle, 2821 Voice Security Bundle, 2821 VSEC Bundle, 2821 WAN Application Acceleration Bundle, 2821 WAN Optimization Bundle, 2851, 2851 HVSEC Bundle, 2851 Secure WAN Optimization Bundle, 2851 Security Bundle, 2851 Unified Communications Bundle, 2851 Unified Communications Bundle with Advanced Security, 2851 V3PN Bundle, 2851 Voice Bundle, 2851 Voice Security Bundle, 2851 VSEC Bundle, 2851 WAN Application Acceleration Bundle, 2851 WAN Optimization Bundle ¦ Cisco Catalyst 2960-24LC-S, 2960-24LT-L, 2960-24PC-L, 2960-24PC-S, 2960-24-S, 2960-24TC, 2960-24TC-L, 2960-24TC-S, 2960-24TT, 2960-48PST-L, 2960-48PST-S, 2960-48T, 2960-48TC, 2960-48TC-L, 2960-48TC-S, 2960-48TT, 2960-48TT-L, 2960-48TT-S, 2960-8TC, 2960-8TC-S, 2960G-24TC, 2960G-48TC, 2960G-8TC, 2960PD-8TT-L, 2960S-24PD-L, 2960S-24PS-L, 2960S-24TD-L, 2960S-24TS-L, 2960S-24TS-S, 2960S-48FPD-L, 2960S-48FPS-L, 2960S-48LPD-L, 2960S-48LPS-L, 2960S-48TD-L, 2960S-48TS-L, 2960S-48TS-S.