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connects to the I/O port connector 0 of another I/O subsystem, record that the next I/O subsystem
identified in substep 8 on page 161 is "looped two," and record the location of the I/O subsystem that
is connected to I/O port connector 1 of the "looped two" subsystem. Go to substep 18.
14. If the RIO cable attached to the I/O port connector 1 (U0.x-P1.1/Q2) of the next I/O subsystem (the
I/O subsystem that is connected to I/O port connector 1 of the "looped one" I/O subsystem) identified
in substep 8 on page 161 connects to port 1 of RIO connector card 2 (U0.1-P1-H2/Q6) of the base
system, record that the next I/O subsystem is "looped two."
15. At the base system, disconnect the cable connection at RIO port 1 of RIO connector card 2
(U0.1-P1-H2/Q6), and reconnect it to RIO port 0 of RIO connector card 2 (U0.1-P1-H2/Q5).
16. At the "looped two" I/O subsystem recorded in substep 14, disconnect the I/O port connector 1
(U0.x-P1.1/Q2) and reconnect to the I/O port connector 0 (U0.x-P1.1/Q1) of the "looped one" I/O
subsystem identified in substep 8 on page 161.
17. Verify that a single RIO cable connects base system RIO port 0 of RIO connector card 2
(U0.1-P1-H2/Q5) to the I/O subsystem recorded in substep 4 on page 161 port connector 0
(U0.x-P1.1/Q1). Go to substep 27.
18. Examine the connection at the I/O port connector 1 (U0.x-P1.1/Q2) of the next I/O subsystem (the I/O
subsystem that is connected to I/O port connector 1 of the "looped two" I/O subsystem) identified in
substep 13 on page 161. If the RIO cable attached to the I/O port connector 1 of the "looped two" I/O
subsystem connects to the I/O port connector 0 of another I/O subsystem, record that the next I/O
subsystem identified in substep 13 on page 161 is "looped three," and record the location of the I/O
subsystem that is connected to I/O port connector 1 of the "looped three" subsystem. Go to substep
23.
19. If the RIO cable attached to the I/O port connector 1 (U0.x-P1.1/Q2) of the next I/O subsystem (the
I/O subsystem that is connected to I/O port connector 1 of the "looped two" I/O subsystem) identified
in substep 13 on page 161 connects to port 1 of RIO connector card 2 (U0.1-P1-H2/Q6) of the base
system, record that the next I/O subsystem is "looped three."
20. At the base system, disconnect the cable connection at RIO port 1 of RIO connector card 2
(U0.1-P1-H2/Q6), and reconnect it to RIO port 0 of RIO connector card 2 (U0.1-P1-H2/Q5).
21. At the "looped three" I/O subsystem recorded in substep 19, disconnect the I/O port connector 1
(U0.x-P1.1/Q2), and reconnect to the I/O port connector 0 (U0.x-P1.1/Q1) of the "looped one" I/O
subsystem identified in substep 8 on page 161.
22. Verify that a single RIO cable connects base system RIO port 0 of RIO connector card 2
(U0.1-P1-H2/Q5) to the I/O subsystem recorded in substep 4 on page 161 port connector 0
(U0.x-P1.1/Q1). Go to substep 27.
23. The RIO cable attached to the I/O port connector 1 (U0.x-P1.1/Q2) of the next I/O subsystem (the I/O
subsystem that is connected to I/O port connector 1 of the "looped three" I/O subsystem) identified in
substep 18 must connect to port 1 of RIO connector card 2 (U0.1-P1-H2/Q6) of the base system.
Record that the next I/O subsystem is "looped four." A maximum of four I/O subsystems can be
looped on a single pair of base system RIO ports.
24. At the base system, disconnect the cable connection at RIO port 1 of RIO connector card 2
(U0.1-P1-H2/Q6), and reconnect it to RIO port 0 of RIO connector card 2 (U0.1-P1-H2/Q5).
25. At the "looped four" I/O subsystem recorded in substep 23, disconnect the I/O port connector 1
(U0.x-P1.1/Q2) and reconnect to the I/O port connector 0 (U0.x-P1.1/Q1) of the "looped one" I/O
subsystem identified in substep 8 on page 161.
26. Verify that a single RIO cable connects base system RIO port 0 of RIO connector card 2
(U0.1-P1-H2/Q5) to the I/O subsystem recorded in substep 4 on page 161 port connector 0
(U0.x-P1.1/Q1).
27. If an I/O subsystem was "looped two," verify that the "looped one" I/O subsystem I/O port connector
1 (U0.x-P1.1/Q2) is connected to the "looped two" I/O subsystem I/O port connector 0
(U0.x-P1.1/Q1).
162
EserverpSeries 650 Service Guide
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