![4.3 TEST MODES](/images/new-backgrounds/105107/10510755x1.webp)
Black Box G.SHDSL.bis EFM CPE
4.3 TEST MODES
The
Figure 6 is a block diagram of the
Figure 7.
4.3.1 Loopbacks
The
NOTE: Local loopback causes bit errors on the remote end if the link is up.
Figure 8. Local Analog Loopback diagram
The data received is looped back before going out on the DSL line. Note that this loop- back occurs after the pattern generator/BER meter. This means that running a 511 pat- tern in conjunction with an LAL should result in no error detected by the meter.
The data path for the RDL is shown in Figure 10.
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