Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 569 / 874

Chapter 17 Hardware procedures 569
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
— “Locations of installed brandline covers and top frame brackets”
(page 571)
• You need these tools (and refer to the figure “Types of screws used with
frame enclosure hardware” (page 120)):
— a step ladder to access the top of the 212.5 cm (7-ft.) NEBS 2000
frame
— if a frame ground cable needs to be disconnected, a driver for the
very large slotted pan-head screws P0883403 and a 10-cm (4-in.)
shaft to reach through the bracket to the cable lug
— a driver for the 10-mm (3/8-in.) thread-forming hex-head mounting
screws P0601478 with a 10-cm (4-in.) reach past the front of the
bracket to the frame uprights as shown in the figure “Locations of
installed brandline covers and top frame brackets” (page 571)
• Do this procedure before the installation procedure “Grounding the
NEBS 2000 frame” and before “Powerup of a Passport 15000 or 20000”
in NTP 241-1501-240.
Procedure steps
1 When any ground cables are already fastened to the top of the frame,
switch off the power sources to all equipment in the frame. Also switch off
all breakers on the BIP.
2 Record the position of all cables grounded to the top of the frame.
3 Disconnect the 2 slotted screws P0883403 from the frame ground cable
lug. Leave the cable hanging freely. Put the screws aside for re-use.
4 Disconnect any other ground cables at the top of the frame. Put the
screws aside for re-use.
5 Hold the top frame bracket so that:
• the part number is on top
• the smaller rectangular opening between the mounting ears faces
away from you
6 Align the mounting ears at both sides of the bracket with the top 2 pairs of
dimples or holes on the frame uprights as indicated by the figure
“Locations of installed brandline covers and top frame brackets”
(page 571). The top of the bracket (largest surface) should align with the
top of the frame.