6947ch01.fm Draft Document for Review April 7, 2004 6:15 pm
8 IBM eServer zSeries 990 Technical Guide
Figure 1-3 System overview
1.3.7 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 th ese links can eithe r be configur ed
for ICBs, or be connected to STI distribution cards in the I/O cage(s). The data rate f or the STI
is 2 GBytes/sec.
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.
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 ca ge
in the A frame. The Z frame can accommodate an additional two I/O cages, making a total of
three for the whole system. Figure1-4 on page 9 shows the layout of the frames and I/O
cages.
Processor
4 flexible Models (A08, B16, C24 & D32)
64-bit Architecture
32 characterizable PUs, CMOS9G-SOI Technology
SuperScalar
Capacity Upgrade on Demand including Memory and I/O
Hybrid Cooling (Air/Liqu id)
Up to 30 Logical Partitions
Optional ETR feature
Memory
64 GB per Model, max system memory 256 GB
Card sizes 8, 16, 32 GB (2 cards per Book)
Bi-directional redundant Ring Structure
I/O
64-bit Architecture (42/48-bit I/O addressing in hardware)
Up to 48 x 2 GB/s Self-Tim ed Interconnec ts (STIs)
I/O cage with enhanced power
Up to 4 Logical Channel Subsystems (LCSS)
Up to 120 FICON Expr ess™Channels
FCP SCSI over Fibre Channel
Up to 48 OSA-Express network connectors
Crypto
SSL
PCIXCC
No CHPID number required
Up to 16 HiperSockets
Parallel Sysplex technology
ICB-4 (2 GB/s), ICB-3, IC B-2, ISC-3, IC
CF Duplexing
HMC
Alternate Service Element
Z frame
MDA MDA
MDA MDA

Cargo

IBF
IBF
MDA
A frame
MRU MRU
MDA MDAMDA MDA
MDA
IBF
BPD

Cargo

Dual SEs
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.