![]() 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. 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. Cross-overThe first (far left) colored wire at one end of the cable is the third colored wire at the other end of the cable. 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. Figure 5-5 RJ-45 Cable Identification Examine the sequence of colored wires to determine the type of RJ-45 cable, as follows: Straight-throughThe colored wires are in the same sequence at both ends of the cable. A communications transceiver can use loopback for testing its functionality. This is primarily a means of testing the transmission or transportation infrastructure. There are eight pins total in a RJ-45 connector.įigure 2 shows the pinout for building a T1 loopback adapter. Loopback, or loop-back, refers to the routing of electronic signals, digital data streams, or flows of items back to their source without intentional processing or modification. 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. Loopback adapters and crossover cables are useful tools for troubleshooting both DDS & T1 circuits. ![]() Loopback Adapters and Crossover Cables for T1 and DDS Circuits
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