6947ch03.fm Draft Document for Review April 7, 2004 6:15 pm
76 IBM eServer 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 (4 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.

Table3-1 lists the I/O domain-to-I/O slot relationships with in 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
23456 98 10111213141516177181
19
2021
22
23
2425262728293031
333435 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-STI2 GB-STI2 GB-STI
(1) (2)
(2)(2)