Chapter 5. Loop Back and BERT Testing
98
November 2001
Data Port local analog loop back.
Data Port local analog loop back is performed by connecting the
data channel transmit data (TD) to the input of the receive path
(RD) before the CSU, as shown in Figure 5-6. The test signal is
provided by the local DTE.
Figure 5-6. Data Port local analog loop back
User
DTE
Data
Port
E1
E1 LINE
LOCAL ETU-01A
DSU
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