IBM 990 Reference Manual page 52

z990 Frame and I/O Confi guration Content: Planning for I/O
The following diagrams show the capability and fl exibility
built into the I/O subsystem. All machines are shipped with
two frames, the A-Frame and the Z-Frame and can have
between one and three I/O cages. Each I/O cage has 28
I/O slots.
Z-Frame
A-Frame
CEC
I/O
Cage
I/O Feature Type Features
ESCON 28 cards
FICON Express
OSA-Express
PCIXCC
PCICA
Maximum combined FICON Express, OSA-Express, PCICA/PCIXCC fea-
tures is 20.
Z-Frame
A-Frame
CEC
2nd
1st
I/O Cage
I/O Cage
I/O Feature Type Features
ESCON 35 cards
FICON Express
OSA-Express
PCIXCC
PCICA
Maximum combined FICON Express, OSA-Express, PCICA/PCIXCC fea-
tures is 40.
Single
I/O cage
Maximum
420 channels
20 40 channels
20 40 ports
4 4
2 4 cards
2
I/O cages
Maximum
512 channels
40 80 channels
24 48 ports
4 4
4 8 cards
Z-Frame
A-Frame
3rd
CEC
I/O Cage
2nd
1st
I/O Cage
I/O Cage
I/O Feature Type
ESCON
FICON Express
OSA-Express
PCIXCC
PCICA
Maximum combined FICON Express, OSA-Express, PCICA/PCIXCC fea-
tures is 60.
General Information:
• ESCON confi gured in 4-port increments. Up to 28 chan-
nels in 2 cards, 60 channels in 4 cards, 88 channels in 6
cards.
• 120 in 8 cards, etc. up to a maximum 69 cards, 1024
channels.
• OSA-Express can be Gigabit Ethernet, 1000BASE-T
Ethernet or Token-Ring.
• Total number of PCIXCC / PCICA is 8 per system.
• If ICB-2 or ICB-3 are required on the system, these will
use up a single I/O slot for every 2 ICB-2 or ICB-3 to
accommodate the STI-2 and STI-3 cards.
52
3
I/O cages
Features Maximum
35 cards 0 channels
60 120 channels
24 48 ports
4 4
6 12 cards