Nortel Networks DCT1900 - Manual (Page 168)

Technical Product Manual - DCT1900
Installation Instructions, or BDVNB 101 01/3
4-14 Install-DCT1900/R8/mw
© 2000-2005
z Any cabinet needs to have a minimum of two circuit boards installed in it for the power supply
to operate correctly.
z If your new cabinet is ordered with only one circuit board, then you need to plan on moving
another circuit board out of an existng cabinet. This may entail moving cables. Any
movement of existing boards should be done after the cabinet is added and the system is back
on line.
z What board(s) are you placing in the new cabinet and what slots are they going into? Refer to
Section 5, Chapter 3.2.
z Watch the power consumption totals for the backplane in each cabinet. Refer to Section 4,
Chapter 2.2.
z When am I going to do this? Downtime needs to be scheduled for this operation. Allow plenty
of time and let all users know the schedule.
z You will be removing termination resistors and knockout plates. The rule is "Where two
cabinets touch, remove the termination resistors and knockout plates in both cabinets at that
point."
Pre-planning Questions
z Where do you physically add the new cabinet? On which side of the existing cabinet(s) do you
install the new cabinet?
Examine your current system and compare it to Figure 4-1. Are you adding cabinet 2, or 3, or
4? Plan to add your new cabinet in the location identified in this figure. Make sure the
appropriate location on the wall is cleared out for the new cabinet.
z Where will the power supply(s) for the new cabinet be mounted?
Power supply should not be mounted directly beneath cabinets because the heat from the
power supply will rise directly into the cabinet. Mount them off to the side of the cabinets or at
least 3 feet below the cabinets.
z Where will the additional LTU/CLU/SLU/DTU blocks be mounted?
66 blocks should not be mounted directly beneath the bottom of the cabinets as the blocks will
interfere with the drop down bottom of the cabinet and you might short something out on the
block. Leave as least a foot or two of free space below the cabinets.
z How will the LTU/CLU/SLU/DTU cables be routed?
All cables coming into or out of the cabinets come out of the bottom of the cabinets. Leave
enough free space under the cabinets to form and route the cables to their termination point