CTC Union ETU01-Plus, Руководство пользователя

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Chapter 4. Test & Diagnostics
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4.4 Local Analog Loop Back
This test is activated by depressing the "Loc ana loopbk" button. This test checks
the performance of the ETU01-Plus, the local data terminal and the connections
between them. It is performed separately at the local and the remote sites (see
Figure 4.2):
Figure 4.2 Local analog loop back
4.5 Local Digital Loop Back
This test is activated by depressing the "Loc dig loopbk" button. The test consists
of looping the received data back to the remote ETU01-Plus. This test checks the
performance of the local ETU01-Plus, the remote ETU01-Plus and the connections
between them (see Figure 4.3).
Figure 4.3 Local digital loop back
E1
ETU-01
XMTR
RCVR
Loc ana loopbk
Depressed
DATA
TERMINAL
CLK
DATA
DATA
CLK
X
ETU01-Plus
ETU-01
Loc dig loopbk
Depressed
XMTR
RCVR
E1
Local
Data
Terminal
ETU01-Plus