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long wavelength (LX) and short wavelength (SX) features,
though the LX and SX cannot be intermixed on a single
feature. Note, the maximum quantity of FICON Express,
OSA-Express, PCICA, and PCIXCC features in combina-
tion cannot exceed 20 features per server.
Up to 80 FICON Express2 Channels
Up to 80 FICON Express2 channels are supported on the
z890. This offers a 100% increase in FICON channels over
the z800. FICON Express2 is available in long wave
length
(LX) and short wavelength (SX) features. Each FICON
Express2 feature has four independent ports which support
four channels per card. The LX and SX cannot be intermixed
on a single feature. The maximum number of FICON Express2
features that can be installed in the I/O cage is 20.
The z890 supports up to 80 FCP channels for attachment
to Small Computer System Interface (SCSI) disks in a Linux
environment. The same four-port FICON Express2 feature
card used for FICON Express2 channels can also be used
for Fibre Channel Protocol (FCP) channels. FCP channels
are enabled on these existing features via a Licensed Inter-
nal Code (LIC) with a unique mode of operation and CHPID
defi nition (FCP). FCP is available in long wavelength (LX)
and short wavelength (SX) features, though the LX and SX
cannot be intermixed on a single feature. Note, the maxi-
mum quantity of FICON Express, FICON Express2, OSA-
Express, OSA-Express2, PCICA, and PCIXCC features in
combination cannot exceed 20 features per server.
InterSystem Channel-3 (ISC-3)
A four link ISC-3 feature is provided on the z890 family of
servers. It consists of a mother card with two daughter cards
each with two links. Each link is capable of operating 1 giga-
bits per second (Gbps) in Compatibility Mode or 2 Gbps in
peer mode up to an unrepeated distance of 10 km (6.2 miles).
The mode is selected for each link via the CHPID type in the
IOCDS. ISC-3 links are ordered in increments of one. It is rec-
ommended that an initial order for ISC-3 include two links.
ISC-3 links in Compatibility Mode must be used for connec-
tivity to 9672s (ICB-2 links are not supported on the z890).
An RPQ card (8P2197) is available to allow ISC-3 dis-
tances up to 20 km. This card runs in Peer Mode at 1
Gbps and/or Compatibility Mode at 1 Gbps. A unique
daughter card with two links per card is shipped.
Integrated Cluster Bus-3 (ICB-3)
The ICB-3 feature is a coupling link used to provide high-
speed communication between z990 and z890 servers
and z900 and z800 General Purpose Servers and Cou-
pling Facilities over a short distance (less than 7 meters).
The ICB-3 is supported via an STI-3 card which resides in
the I/O cage and converts the 2.0 GBps input into two 1
GBps ICB-3s.
Integrated Cluster Bus-4 (ICB-4)
The ICB-4 feature is a coupling link used to provide
high-speed communication between a z990 and/or z890
servers over a short distance (less than 7 meters). The
ICB-4 consists of one link that attaches directly to a 2.0
GBps STI port on the server and does not require connec-
tivity to an I/O cage.
Internal Coupling Channel (IC)
IC links emulate the coupling links between images within
a single server. IC links are defi ned in the IOCP. There is no
physical channel involved. A z/OS image can connect to a
Coupling Facility on the same server using IC capabilities.