IBM 990 - Manual (Page 88)

76 IBM
^
zSeries 990 Technical Guide
Figure 3-2 z990 I/O cage
Each I/O domain requires one Self-Timed Interconnect Multiplexer (eSTI-M) card. All I/O
cards within an I/O domain are connected to its eSTI-M card via the back plane board. A full
I/O cage requires seven eSTI-M cards, which are half-high cards, using three and a half slots.
In addition, two Distributed Converter Assembly-Cage Controller (DCA-CC) cards plug into
the I/O cage and the “other half” of slot 28 may be used for a Power Sequence Control (PSC)
card.
If one I/O domain is fully populated with ESCON cards (15 available ports and one spare per
card), up to 60 (four cards x 15 ports) ESCON channels can be installed and used. A fully
populated I/O cage with ESCON cards can have up to 420 (60 x 7 domains) ESCON
channels.
Table 3-1 lists the I/O domain-to-I/O slot relationships within an I/O cage.
Table 3-1 I/O domain-to-I/O slot relationships
Domain I/O slots in domain
0 01, 03, 06, 08
1 02, 04, 07, 09
2 10, 12, 15, 17
3 11, 13, 16, 18
4 19, 21, 24, 26
I
/
O
A
I
/
O
B
I
/
O
A
I
/
O
B
S
T
I
M
A
B
I
/
O
A
I
/
O
B
I
/
O
A
I
/
O
B
I
/
O
C
I
/
O
D
I
/
O
C
I
/
O
D
S
T
I
M
C
D
I
/
O
C
I
/
O
D
I
/
O
C
I
/
O
D
Board
I
/
O
G
I
/
O
G
I
/
O
G
S
T
I
M
G
I
/
O
F
I
/
O
E
I
/
O
F
I
/
O
E
S
T
I
M
E
F
I
/
O
F
I
/
O
E
I
/
O
F
I
/
O
E
D
C
A
/
C
C
2
I/O Domain 0
I/O Slots
1-3-6-8
I/O Domain 1
I/O Slots
2-4-7-9
I/O Domain 2
I/O Slots
10-12-15-17
I/O Domain 3
I/O Slots
11-13-16-18
I/O Domain 6
I/O Slots
29-30-31-32
I/O Domain 5
I/O Slots
20-22-25-27
I/O Domain 4
I/O Slots
19-21-24-26
2 3 4 5 6 9 8 10 11 12 13 14 15 16 17 7 18 1
19 20 21 22 23 24 25 26 27 28 29 30 31 33 34 35 32
Front of
I/O Cage
Rear of
I/O Cage
36
I
/
O
G
D
C
A
/
C
C
1
2 GB-STI 2 GB-STI 2 GB-STI
2 GB-STI 2 GB-STI 2 GB-STI 2 GB-STI
(1) (2)
(2) (2)