Alcatel-Lucent 1830 PSS-16 Maintenance And Trouble-Clearing User Manual page 672

Supporting procedures Loopback Variation on OTs
Performing loopbacks
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Figure 3-17 4DPA4 (No FEC) – Loopback Position
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3-64 1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011