Nokia DNT2Mi sp/mp - Manual (Page 36)

Data Network Terminal Single-port and Multiport Operating Instructions
36 (128) © Nokia Corporation DN01145897
Nokia Proprietary and Confidential Issue 2-0 en
Note
Figure 22. Grounding principle of the remote-powered system
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.
Figure 23. Remote power feed connection
Earthing bar
Line
1.0 mm
2
Power cable
To remote
DC power
Line 1
Line 2
DNT2Mi-rp/mp
To remote
DC power
Line 1
Line 2
DNT2Mi-rp/mp
Line
block Line
block
Lines correct Lines cross-connected
Power available and
data transfer possible Power available but data
transfer not possible
a
a
b
b
a
b
a
b