T1 loopback plug11/19/2023 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. Your email address will not be published. For more detailed information on how to build T1 loopback plugs and do loopback testing, please read Loopback Tests for T1/56K Lines. One thought on Which two sets of pins are looped on an RJ-45 56K loopback plug rjdxgsfgsf says: at 12:01 AM. Loop pins 1 to 4 and 2 to 5 to create a T1 loopback plug using an RJ-45 modular jack. 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. You can do further loopback testing by using a hardware loopback plug. 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. 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. If it doesn't work, you've either built it wrong or the CSU/DSU isn't working properly.Loopback Adapters and Crossover Cables for T1 and DDS Circuits If it does, you've successfully built the plug. Place the loopback plug into the T1 port and you should see the unit "synch" to itself by indicating either "Link" or having whatever is used for the WAN interface to show the unit now has sync. Test it on a "known good" router with a CSU/DSU (T1 interface). Easy to Use Male or Female Application What do customers buy after viewing this item of 1 Start over of 1. Put the Cat 5 end into the crimper and verify all of the wires are pushed all the way into the pin slots and then crimp it down.ĩ. T1/E1/PRI Loopback Plug and Jack RJ45 Testers Carrier or Equipmet Loop Back. You should now have 2 wires "looped" in the cat 5 blank end with pin 1 connecting pin 4 and pin 2 connecting pin 5Ĩ. Put one end of the second wire into pin 2 and bend it in half and put the other end into pin 5.ħ. T1 Loopback Plug for Testing T1/56K Lines Brand, RiteAV Item model number, T1-Loop Item Weight, 1.6 ounces Package Dimensions, 6 x 4 x 0.2 inches. Put one end of the first wire (either one will do) into pin 1 and bend it in half and put the other end of it into pin 4.Ħ. If you are looking at it this way, the bottom slot is pin 1 and the top is pin 8.ĥ. You also need to configure clock source internal on the T3 serial interface/controller, and all T1 controllers (PA-MC-T3 only). Use this coaxial cable to connect the Transmit (TX) port on the port adapter to its Receive (RX) port. Identify the pin order on the Cat 5 end: hold it with the movable/press-side of the clip away from you and the metal contacts facing left. In order to set a hard plug loopback, you need a 75 ohms coaxial cable with male BNC connectors at each end. usually same colors (brown and brown/white, etc.)Ĥ. Twist the wires from pins 9 and 8 together. Twist the wires from pins 2 and 15 together. Complete the following steps to create a loopback plug for E1 on DB-15: Use wire cutters to cut a working DB-15 cable that is 5 inches long with a connector attached. Cut off about 2 to 4 inches of a Cat 5 cableģ. Creating the Loopback Plug for E1 on DB-15.
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