Nevion SL-D32P+ - Manual (Page 17)

SL-D32P+ Rev. F
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Note that each device at the end of the chain has a termination plug, indicated with the
letter “T”. This termination plug must be inserted in the correct connection port. If not, no
NCB communication is possible.
4.1.3.3 Termination plug
The termination plug that is mentioned in the previous chapter is necessary when you want
to avoid closing the loop be a (long) cable.
The termination plug is a standard RJ45 plug with the following internal wiring:
As seen in the figure above, Pin 3 is connected to Pin 4, and Pin 5 is connected to Pin 6.
4.1.3.4 Control bus structure
The Network Control Bus structure follows the standard MIDI bus definition. The NCB is
defined as a closed chain of units. This means that the NCB OUT of the last unit must be
connected to the NCB IN of the first unit in the NCB chain. To avoid problems with the
control of VikinX units the installer/user has to assure that the bus structure is installed
according to this definition.
The total number of VikinX devices in an NCB chain is limited to 50.
4.1.3.5 Maximum distance between NCB devices
The standard MIDI definition allows a maximum cable length of 200-250 meters between
two devices. Longer distances can be made with MIDI repeater units. To avoid grounding
problems all NCB ports have opto-coupled inputs.
4.1.4 Router extension
Use the Extension loop connectors when multiple routers are connected together to form a
bigger router. Connect EXT OUT from one router to the EXT IN on the next router, and so
on. Connect EXT OUT from the last router in the loop back to EXT IN on the first router in
the loop.
Router extension will only work if the loop is closed, as explained above.
See also Chapter 2.5 and Chapter 3.2.8 for configuration of SL-D32P+ into bigger data
routers.
4.1.4.1 Maximum cable length (Coax)

Maximum cable length: 300m, using Belden 8281, or similar quality cable.

Return loss: 15dB on EXT ports.
When in loop-through (happens on a power failure), total cable length between three
routers is 300m, if the router in the middle looses power. Longer extension cables between
the routers are possible, if the signal is regenerated near the data router(s). This is done