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channels are enabled on these existing features via a
License Internal Code (LIC) with a new mode of operation
and new CHPID defi nition. FCP is available in long wave-
length (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 combination
cannot exceed 20 features per I/O cage and 60 features
per server.
InterSystem Channel-3 (ISC-3)
A four feature ISC-3 link is provided on the z990 family
of servers. It consists of a mother card with two daugh-
ter cards which have two links each. Each of the four is
capable of operation at 1 gigabit 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 port via the CHPID type in the IOCDS.
The ports are orderable in one-port increments.
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.
Integrated Cluster Bus-2 (ICB-2)
The ICB-2 feature is a coupling link used to provide high-
speed communication between a 9672 G5/G6 server and
a z990 server over a short distance (less than 7 meters).
The ICB-2 is supported via an STI-2 card which resides in
the I/O cage and converts the 2.0 GigaBytes per second
(GBps) input into two 333 MegaBytes per second (MBps)
ICB-2s. ICB-2 is not supported between z990 and other
zSeries servers. ICB-2s cannot be used to connect to a
z900 server.
Integrated Cluster Bus-3 (ICB-3)
The ICB-3 feature is a coupling link used to provide high-
speed communication between a z990 Server and a z900
General Purpose Server or Model 100 Coupling Facility
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 server
over a short distance (less than 7 meters). The ICB-4 con-
sists of a link that attaches directly to a 2.0 GBps STI port
on the server and does not require connectivity 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.