Nokia DNT2Mi sp/mp user manual Lines cross-connected, Lines correct

Data Network Terminal Single-port and Multiport Operating Instructions

Earthing bar	1.0 mm2
Line	Power cable

Figure 22. Grounding principle of the remote-powered system

Note

If the remote power feed is connected in a wrong way, that is, if the pairs are cross-connected at the DNT end, the receiving remote unit still functions properly. However, in this situation data transfer is not possible. See Figure 23.

Lines correct		Lines cross-connected
	DNT2Mi-rp/mp		DNT2Mi-rp/mp
	a		a
Line 1	b	Line 1	a
	a		b
Line 2	b	Line 2	b
	Line		Line
	block		block
To remote		To remote
DC power		DC power
Power available and			Power available but data
data transfer possible			transfer not possible

Figure 23. Remote power feed connection

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