This cable can be used to connect two DDS CSU/DSU (i.e., DSU) products in a back-to-back configuration. This pinout is the same for both a RJ-45 plug and RJ-45 jack.įigure 5 shows the pinout for building a DDS crossover cable. Unlike patch cable, crossover cable uses two different wiring standards on both end: one end uses the T568A wiring standard, and the other end uses the T568B wiring standard. This cable can be used to connect two T1 CSU/DSU (i.e.,TSU) products in a back-to-back configuration.įigure 4 shows the pinout for building a DDS loopback adapter. Crossover cable, as the name suggests, cross over or swap on its way when coming from one end to the other.
This pinout is the same for both a RJ-45 plug and RJ-45 jack.įigure 3 shows the pinout for building a T1 crossover cable. There are eight pins total in a RJ-45 connector.įigure 2 shows the pinout for building a T1 loopback adapter. RJ-45-to-DB-9 Adapter RJ-45-to-DB-25 Adapter RJ-45-to-DB-9 Adapter This adapter connects a router to a PC though a COM port. This document shows the necessary pinout for building them.įigure 1 shows a how to orient a standard RJ-45 to RJ-45 silver satin cable to determine pin 1. Pin-outs for RS 232 Straight Through Cable (DB-25) Adapters You need two types of adapters to connect a PC to a router. Loopback adapters and crossover cables are useful tools for troubleshooting both DDS & T1 circuits. Loopback Adapters and Crossover Cables for T1 and DDS Circuits