IBM 7133 D40, Service Manual

Page: 41 / 306

Note: In the remainder of this book, the term “optical extender” is generally used for
the Advanced SSA Optical Extender.
A wrap cable and adapter assembly
7
is provided with each optical extender. This
assembly consists of a fibre optic wrap cable
8
and a fibre optic wrap adapter
9
.
The two parts of the assembly are used during diagnostic procedures. The wrap cable
connects the connectors of the optical extender to each other; the fibre optic wrap
adapter connects the two fibre optic cables to each other.
Attention:
v
Before fibre optic cables are connected, they must be checked to ensure that their
end faces are clean. If necessary, use a small cotton pad to apply a fibre-cleaning
fluid, such as IPA/D-1 Water Mix 106-17F, to the end faces.
v
When the wrap cable and adapter assembly is not in use, the ends of the wrap cable
are protected as follows:
– If the wrap cable is 400 mm (15 in.) long, each of its ends is connected to the
wrap adapter to make a closed loop.
– If the wrap cable is 150 mm (6 in.) long, one end of the cable is connected to the
wrap adapter, and protective covers are placed over each end of the complete
wrap cable and adapter assembly.
The wrap cable and adapter assembly must be kept in its plastic bag in a safe place
that is as close to the optical extender as possible. At least one wrap cable and
adapter assembly must be kept at each end of the link.
All the connectors for the fibre optic cables are bayonet (push-and-twist) connectors.
The installation and repair of fibre optic cables must be done by a fibre optics specialist.
Chapter 1. Reference Information
23