Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 868 / 874

868 Chapter 17 Hardware procedures
241-1501-240 5.2S2
Unpacking a shelf assembly
Unpack a shelf assembly just prior to installing it.
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• A shelf assembly is identified by one of the following PECs:
— For a Passport 15000, an NTHW99CA with DS1timing
— For a Passport 15000, an NTHW99DA with E1 balanced timing
— For a Passport 15000, an NTHW99EA with E1 unbalanced timing
— For a Passport 20000, an NTPN77BA with DS1timing
— For a Passport 20000, an NTPN77CA with E1 balanced or
unbalanced timing
Procedure steps
1 Carefully move the shipping container to where the NEBS 2000 frame is
anchored.
2 Plug in an anti-static wrist strap or equivalent device into a properly
grounded receptacle and wear the strap whenever handling a hardware
part.
3 Open the container of the shelf assembly. When cutting the tape or straps
that seal the container, make very shallow cuts. Do the box ends before
the sides so that you can raise the middle slightly to cut it.
4 Gently remove any loose padding surrounding the contents, if present.
Avoid contacting the rows of exposed pins or connectors with the packing
material. Do not touch any pins or connectors.
5 Remove the shelf from all packaging so that you can see all sides. Do not
hold the shelf assembly by the ribs or rails inside the cavity. These will
break.
6 Verify the straightness of the backplane pins according to the procedure
“Checking the backplane pins” (page 258).
7 If the unit seems undamaged, put the original packing material and
container aside for returning the removed shelf assembly.