IBM 990 - Manual (Page 176)

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zSeries 990 Technical Guide
7.2.4 Coupling Facility link connectivity
The type of CF links you can use to connect a CF to an operating system logical partition is
important because of the impact of the link performance on response times and coupling
overheads. For configurations covering large distances, the time spent on the link can be the
largest part of the response time (mainly if the CF is defined on a z990 server).
The types of links that are available to connect an operating system logical partition to a
Coupling Facility are:
IC: Licensed Internal Code defined links to connect a CF to a z/OS logical partition in the
same z990 processor. IC links require two CHPIDs to be defined and can only be defined
in Peer mode. The link bandwidth is greater than 2 GBps. A maximum of 32 IC links can
be defined per z990.
ICB-4: Copper links are available to connect z990 to z990, or z890 processors; the
maximum distance between the two processors is 7 meters (maximum cable length is 10
meters). The link bandwidth is 2 GBps. ICB-4 links can only be defined in Peer mode.
Maximum number of ICB-4 links is 16 per z990.
ICB-3: Copper links are available to connect z990 to z990, z890, z900, or z800
processors; the maximum distance between the two processors is 7 meters (maximum
cable length is 10 meters). The link bandwidth is 1 GBps. ICB3 links can only be defined in
Peer mode. Maximum number of ICB-3 links is 16 per z990.
ICB-2: Copper links are available to connect a z990 to 9672 G5/G6 processors (you
cannot use ICB-2 to connect a z990 to a z900 or to another z990); the maximum distance
between the two processors is 7 meters (maximum cable length is 10 meters). The link
bandwidth is 333 MBps. Maximum number of ICB-2 links is eight per z990.
ISC-3: The z990 ISC-3 feature is compatible with Coupling Links/ISCs (referred to as a
Hiperlink on G5/G6 Servers) on S/390 generation 5 and generation 6 servers as well as
zSeries 890, zSeries 900, and zSeries 800. Each port is capable of 1 Gbps or 2 Gbps,
depending upon the mode of operation selected in the Hardware Configuration Definition
(HCD) tool or IOCP. Ports are ordered in increments of one. The maximum number of
ISC-3 links per z990 is 48 in peer mode, and 32 ISC-3 links in compatibility mode.
– There are fiber links available to connect z990 to z990, z890, z900, or z800
processors; the maximum distance is 10 km, 20 km with RPQ 8P2197, and 40 km with
Dense Wave® Division Multiplexing (DWDM). ISC-3s operate in single mode only and
link bandwidth is 200 MBps for distances up to 10 km, and 100MBps when RPQ
8P2197 is installed. ISC-3 links should be defined in peer mode. The peer mode is
used between zSeries servers only.
– There are fiber links available to connect z990 to G5 and G6 servers. The z990 ISC-3
feature is compatible with Coupling Links/ISCs (referred to as a Hiperlink) on G5/G6
servers. Compatibility mode is used between the z990 and G5/G6 servers. The port is
defined as a sender/receiver (CFS/CFR) channel and the link is capable of 1 Gbps.
Table 7-3 z990 Coupling Link maximums
Link Type z990 Max
IC 32
ISC-3 48
a
ICB-2 8
ICB-3 16
ICB-4 16