Chapter 4. Central processor complex I/O system structure 175
CHPIDs per port and seven subchannels (devices) per CHPID. ICA SR supports
transmission of STP messages.
Parallel Sysplex using IFB connects to z13, z13s, zEC12, zBC12, z196, or z114 servers.
12x InfiniBand coupling links are fiber optic connections that support a maximum distance
of up to 150 meters (492 ft.). IFB coupling links are defined as CHPID type CIB. IFB
supports transmission of STP messages.
z13s servers support one type of 12x InfiniBand coupling link: FC 0171 HCA3-O (12xIFB)
fanout.
IFB LR: InfiniBand Long Reach (IFB LR) connects to z13, z13s, zEC12, zBC12, z196, or
z114 servers. 1x InfiniBand coupling links are fiber optic connections that support a
maximum unrepeated distance of up to 10 km (6.2 miles), and up to 100 km (62 miles)
with a z Systems qualified DWDM. IFB LR coupling links are defined as CHPID type CIB,
and support 7 or 32 subchannels per CHPID. IFB LR supports transmission of STP
messages.
z13s servers support one type of 1x InfiniBand coupling link: FC 0170 HCA3-O LR (1xIFB)
fanout.
Internal Coupling (IC): CHPIDs (type ICP) that are defined for internal coupling can
connect a CF to a z/OS LPAR in the same z13s server. IC connections require two
CHPIDs to be defined, which can be defined only in peer mode. A maximum of 32 IC
CHPIDs (16 connections) can be defined.
Table 4-12 shows the coupling link options.
Table 4-12 Coupling link options
Note: ISC-3, HCA2-O, and HCA2-O LR are not supported on z13s servers. The zEC12
and zBC12 are the last servers that support ISC-3, HCA2-O, and HCA2-O LR coupling
links (by carry-forward only). HCA3-O (LR) on z13s servers, however,
can connect to
HCA2-O (LR) on previous generation servers.
IFB and IFB LR links contend for adapter space. Total port counts vary depending upon the
number of configured IFB links, IFB LR links, and I/O drawers (I/O drawers that are
connected through HCA2-C).
Type Description Use Link
rate
a
a. The link data rates do not represent the actual performance of the link. The actual performance depends on many
factors including latency through the adapters, cable lengths, and the type of workload.
Distance z13s-N10
Maximum
# ports
z13-N20
Maximum
# ports
IFB 12x
InfiniBand
(HCA3-O)
b
z13s to z13, z13s,
zEC12, zBC12,
z196, z114
6 GBps 150 meters
(492 feet)
4
c
16
c
IFB LR 1x IFB
(HCA3-O LR)
z13 to z13, z13s,
zEC12, zBC12,
z196, z114
2.5 Gbps
5.0 Gbps
10 km unrepeated
(6.2 miles)
100 km repeated
(62 miles)
8
c
32
c
IC Internal coupling
channel
Internal
communication
Internal
speeds
N/A 32
d
32
d
ICA SR Integrated
Coupling Adapte
r
z13 to z13, z13s 8 GBps 150 meters
(492 feet)
816
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