IBM 990 - Manual (Page 20)

8 IBM
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zSeries 990 Technical Guide
1.3.7 I/O connectivity
Here we discuss I/O connectivity.
I/O cage
Each book provides 12 STI links (48 STI maximum with four books) for I/O and coupling
connectivity, and for cryptographic feature cards. Each of these links can either be configured
for ICBs, or be connected to STI distribution cards in the I/O cage(s). The data rate for the STI
is 2 GBps.
The z990 I/O cage contains seven STI domains. Each domain has the capability of four I/O
slots. A subset of previous zSeries 900 I/O and cryptographic cards is supported by the I/O
cages in the z990.
The installation of an I/O cage remains a disruptive MES, so the Plan Ahead feature remains
an important consideration when ordering a z990 system.
The z990 is a two-frame server. The z990 has a minimum of one CEC cage and one I/O cage
in the A frame. The Z frame can accommodate an additional two I/O cages, making a total of
three for the whole system. Figure 1-4 shows the layout of the frames and I/O cages.
Figure 1-4 I/O cage layout and supported cards and coupling links
Note: Spanned channels are not supported for ESCON channels, FICON conversion
channels (FCV), and Coupling Receiver links (CBR, CFR).
Note: The z900 compatibility I/O cage is not supported on the z990.
Note: Parallel channels, OSA-2, OSA-Express ATM, pre-FICON Express channels, and
PCICC feature cards are not supported in the z990.
Front View
CEC
cage
1
st
I/O
Cage
3
rd
I/O
Cage
z-Frame A-Frame
2
nd
I/O
Cage
ESCON
FICON/FCP
FICON
™
Express
Networking
OSA-Express
Gigabit Ethernet
1000BASE-T Ethernet
Token Ring
HiperSockets
Coupling Links
ISC-3
ICB-2, ICB-3, ICB-4, IC
Crypto
PCICA
PCIXCC
Not Supported
Parallel
OSA-E ATM and OSA-2
FICON (pre-FICON Express)
PCICC