IBM 990 - Manual (Page 87)

Chapter 3. I/O system structure 75
The following cryptographic feature cards are supported in the zSeries 990 server:
Up to four Peripheral Component Interconnect X Cryptographic Coprocessor (PCIXCC)
Up to 12 Peripheral Component Interconnect Cryptographic Accelerator (PCICA)
All z990 servers have two frames. The A frame holds the CEC cage on top and one I/O cage
on the bottom. The Z frame holds up to two optional I/O cages, which may be needed to
accommodate the I/O configuration requirements.
Figure 3-1 z990 frames and cages
Additional optional I/O cages may be required to install additional I/O and cryptographic cards
during an upgrade. The first optional I/O cage is placed at the bottom of the Z frame, and the
second optional I/O cage is at the top, as shown in Figure 3-1. Although I/O or cryptographic
card installation is concurrent, an I/O cage installation requires an outage.
3.2 I/O cages
As mentioned, the z990 server can have up to three I/O cages to house the I/O cards and
cryptographic cards required by a configuration.
Each I/O cage has 28 I/O slots available for I/O cards and cryptographic cards installation and
up to seven I/O domains. Each I/O domain is made up of up to four I/O slots, as shown in
Figure 3-2 on page 76.
Note: The maximum number of Coupling Links combined (IC, ICB-2, ICB-3, ICB-4, and
active ISC-3 links) cannot exceed 64 per z990 server.
Z Frame
MDA MDA
MDA MDA
IBF
IBF
MDA
A Frame
MRU MRU
MDA MDA
MDA
IBF
BPD
CEC Cage
1st I/O Cage
(standard)
2nd I/O Cage
(optional)
3rd I/O Cage
(optional)