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Chapter 4. troubleshooting and diagnostics, Performing local analog loopback, Activating local analog loopback – RAD Data comm E1 Interface Converter RIC-E1 User Manual

Page 29: Chapter 4, Refer to, For tr, Chapter 4 troubleshooting and diagnostics, 1 performing local analog loopback

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Performing Local Analog Loopback

4-1

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.

G.703

Network

RIC-E1

DTE

Line

Tx

Rx

Tx

Rx

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).

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
electrical shock.

Warning

Note

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