Adtran TRDDS-R Manual Do Utilizador
Page 4
61291021L5-5A
Section 61291021L5-5A, Issue 1
4. TESTING
Loopback Testing
Loopback Testing
Loopback tests can be performed from the CO to verify
proper loop and TRDDS-R operation. The TRDDS-R
features auto-detection capability to determine the model of
Total Reach dataport installed in the central office. This
feature allows the TRDDS-R to support multiple loopback
applications. See Table 4 for an interoperability matrix of
loopback responses supported by the TRDDS-R. The
TRDDS-R always provides an NIE latching loopback at all
rates. See Table 5 and 6 for latching and alternating loopback
sequences. The TRDDS-R supports testing of the two-wire
loop from the remote end when the CO unit is performing a
bidirectional loopback.
proper loop and TRDDS-R operation. The TRDDS-R
features auto-detection capability to determine the model of
Total Reach dataport installed in the central office. This
feature allows the TRDDS-R to support multiple loopback
applications. See Table 4 for an interoperability matrix of
loopback responses supported by the TRDDS-R. The
TRDDS-R always provides an NIE latching loopback at all
rates. See Table 5 and 6 for latching and alternating loopback
sequences. The TRDDS-R supports testing of the two-wire
loop from the remote end when the CO unit is performing a
bidirectional loopback.
Figure 5. Signal Loss Indication
SC
64
56
19.2
9.6
4.8
2.4
0-10
10-20
20-30
30-40
40-50
50-56
>56
LED
SIGNAL LOSS
(dB)
(dB)
Signal level
Signal level indicated during
synchronization
synchronization
Table 3. Faceplate Indicators
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2
Table 4. TRDDS-R and Total Reach Dataport
Loopback Interoperability Matrix
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