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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