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Appendix D. Cabling rules for systems with a migration unit
or the 9079 and 9094 expansion unit
If you already have a migration unit or a 9079 Expansion Unit set up on your
system, there are special cabling rules that you must follow. On the table below,
find your system unit and follow the rule that apply to your system unit.
System unit Rule
iSeries 820
v A 503x migration unit must be in the first position of the HSL
loop if there are a total of three external units or fewer. The
first position is the position that is closest to connector A0 on
the system unit. See Figure 31 on page 46 and Figure 32 on
page 46.
v If there are four or five external units, the 503x must be in the
second position of the HSL loop. There must be one
expansion unit between A0 and the 503x. See Figure 33 on
page 47 and Figure 34 on page 47.
v The 5079 counts as two independent 5074s. If you have two
5079s and one 503x, follow the cabling diagram that is shown
in Figure 35 on page 47.
v The 503x must be in the last position of the SPCN loop. See
Figure 36 on page 48.
iSeries 830
v You cannot install a 5074 or 5079 on the same HSL loop as the
503x or 5077 migration unit. Use the next available HSL
connector.
v The 503x must be in the last position of the SPCN loop. See
Figure 36 on page 48.
v Set up the SPCN cable for your 5074 in the same SPCN loop
as the 5077.
This is true even though you are connecting the 5074 to a
different HSL loop than the 5077.
You can do this by connecting the SPCN cable from J15 of
your new expansion unit to J16 of the 5077.
See Figure 37 on page 48.
iSeries 840
v You cannot install a 5074 or 5079 to the same HSL loop as the
5077.
v You can install up to two 5074s or one 5079 with a 9079 on
the first loop (A0 and A1).
v Set up the SPCN cable for your 5074 or 5079 in the same
SPCN loop as the 5077 or 9079.
This is true even though you are connecting the 5074 or 5079
to a different HSL loop than the 5077 or 9079.
You can do this by connecting the SPCN cable from J15 of
your new expansion unit to J16 of the 5077 or 9079.
See Figure 37 on page 48.
© Copyright IBM Corp. 2000, 2002 45