ATL Telecom AM100 - Manual (Page 2)

23 ATL User Guide
AM100 M Modem
8.2.2 REMOTE LOOP
With a BERT still connected as above, turn off the local loop and apply the remote loop. The
remote loop loops data back to the user interface from the far end modem as shown below, thus
this test can be used to check the integrity of the line.
There should be no errors or a very low error rate. If the error rate received is too high for your
application, try a lower data rate. When you have completed this test, turn off remote loop.
8.2.3 FAR END LOCAL LOOP
If the two tests above have been performed then also perform test 8.2.1 (local loop) on the far end
modem.
8.2.4 LOOPBACK
Applying a Loopback on the local modem causes the received line data to be returned to the far
end modem.
Interface
Transmission
System
Interface
Transmission
System
BERT
remote loop selected from this modem loop applied here
Remote Modem Local Modem
Interface
Transmission
System
Interface
Transmission
System
BERT
local loop applied in this modem
Remote Modem Local Modem
ATL Part No 1/372/001/610
Issue: 01
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The information contained in this document is confidential to ATL Telecom Ltd. and may not be
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© ATL Telecom Ltd 2004.
Note: The information contained in this document is supplied without liability for errors or
omissions.
ATL Telecom Limited reserves the right to make changes to this document at any time without
notice.