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Network Communications—N2 Communications Bus
To add a DCM or XM to a new NEU, connect the N2 Bus to the new
NEU via the respective communication terminal board. Install the
device into a proper, available slot in the NEU. If this device is not the
end-of-line device, set the EOL switch to Out. If this device is the
end-of-line device, set the EOL switch to In.
To add an ASC to the N2 Bus, wire the bus to the designated N2 Bus
terminals. If the ASC is an ILC and it is not the end-of-line device, set
the EOL switch to Out. If the ILC now becomes the new end-of-line
device, set the EOL switch to In, and change the EOL switch of the
previous end-of-line device to Out.
Follow these steps to delete an N2 device:
1. Delete the removed N2 device from system software. Refer to the
Operator Workstation User’s Manual
(FAN 634).
2. To delete a DCM or XM from an installed NCU/NEU, simply remove
the device from the slot. If the EOL switch on this device was set to
In, set the EOL switch of the previous device to In.
To delete an ASC that is between two other N2 devices, disconnect
the In and Out sections of N2 wires at the ASC to be deleted. Connect
the two sections of the same color wire so as to follow proper polarity
(i.e., N2+ IN to N2+ OUT, N2- IN to N2- OUT, REF IN to REF OUT).
To delete an ASC that is at the end of line, disconnect the N2 wiring
from the ASC and disconnect only the N2 OUT wiring from the
upstream device.
A DCM or XM can be moved to a different NCU/NEU or a different slot
in the same NCU/NEU. Also, an ASC can be moved to a different location
on the N2 Bus.
To relocate a DCM or XM to a different slot or different NCU/NEU:
1. Remove the device from the slot.
2. Install the device in the desired slot or NCU/NEU.
3. Change the EOL switches as required.
To relocate an ASC to a different spot on the N2 Bus:
1. Disconnect the N2 Bus wiring.
2. Install the ASC in its new position.
3. Change the EOL switches as required.
Deleting an
N2 Device
Relocating an
N2 Device
