RAD Data comm RIC-E1 Chapter Troubleshooting Diagnostics, Performing Local Analog Loopback

Chapter 4

Troubleshooting and

Diagnostics

4.1 Performing Local Analog Loopback

RIC-E1 supports activation of a V.54 diagnostic (loop 3) local loopback.

This loopback checks the communication and connection between RIC-E1 and the attached DTE, as shown in Figure 4-1. When RIC-E1 performs a local loopback, the data received from the local transmitter is both transmitted on the line and looped back to the local receiver at the digital level. This checks the operation of all local digital circuitry.

DTELine

Tx

Tx

Rx

Rx

RIC-E1

Figure 4-1. RIC-E1 Local Loopback

Activating Local Analog Loopback

You can activate the local analog loopback via DTE interface circuit 141 (for V.35, RS-530 and V.36 interfaces only).

Note When activating the local analog loopback via interface of the DTE connected to the RIC-E1/R card, make sure to set the ALB DTE jumper (JP4) to EN.

Alternatively, you can initiate the loopback via internal jumper of the standalone RIC-E1 or by pressing the ANA pushbutton on the RIC-E1/R panel.

Do not touch any components other than ANA LOOP (JP11) jumper plug while activating the local loopback from the standalone RIC-E1, in order to avoid

Warning electrical shock.

Performing Local Analog Loopback 4-1

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