IBM z/OS - Manual (Page 36)

36
the options to be considered is locating one of the Sysplex
Timers in an intermediary site that is less than 40 km
from one of the two sites (as can be seen in the diagram
below). Other potential options can be evaluated when the
RPQ is ordered.
z990 Theoretical Maximum Coupling Link Speed
• ISC-3. InterSystem Channel-3 provides the connectivity
required for resource or data sharing between the Cou-
pling Facility and the systems directly attached to it.
ISC-3s are point-to-point connections that require a
unique channel defi nition at each end of the channel.
ISC-3 channels operating in Peer Mode provide con-
nection between zSeries (z800/z900/z990) general
purpose models and zSeries Coupling Facilities. ISC-3
channels operating in Compatibility Mode provide con-
nection between zSeries and HiPerLink (ISC-2) channels
on 9672 G5 and G6 and the 9674 R06 Models. A four
port ISC-3 card structure is provided on the z990 pro-
cessors. It consists of a mother card with two daughter
cards which have 2 ports each. Each daughter card is
capable of operation at 1 Gbps in Compatibility Mode
or 2 Gbps in Peer Mode up to a distance of 10 km. From
10 to 20 km, an RPQ card which comes in 2 port incre-
ments is available which runs at 1 Gbps in both Peer
and Compatibility Modes. The mode is selected for each
port via CHPID type in the IOCDS. The ports are acti-
vated in one port increments.
• ISC-2. HiPerLinks. HiPerLinks, based on single-mode
CF links, are available on 9672s (G3 - G6) and 9674s
only. ISC-3s replace HiPerLinks on zSeries 900 and z990
models.
• ICB-2. The Integrated Cluster Bus-2 is used to provide
high-speed coupling communication between a zSeries
server or CF and a 9672 G5/G6 server or CF over short
distances (~7 meters). For longer distances, ISC links
must be used. The z990 features the STI-2 card which
resides in an I/O cage and provides 2 ICB-2 ports each
capable of up to 333 MBps. The ports are activated in
one port increments. Up to 4 STI-2 cards, 8 ICB-2 links
are available on the z990.
CPC CPC
D
W
D
M D
W
D
M
D
W
D
M D
W
D
M
D
W
D
M D
W
D
M
Route A
Route B
ETR
ETR ETR
ETR ETR
ETR
ETR
CLO CLO
1 12
2
3
4
5 6 7
8
9
10
11 1 12
2
3
4
5 6 7
8
9
10
11
9037 9037
1 ETR link
per CPC
hut with
amplifiers
1 ETR
link per
CPC
1 ETR
link per
CPC
2 CLO
links
40 km max 40 km nom
up to
100 km
Site 1 Site 2
Note: Midspan 9037 can also be located within 40 km of site 2 or on Route B.
All ETR and CLO links are provisioned as 1 channel per wavelength.
Connectivity
Options
z990 ISC-3 z990 ICB-2 z990 ICB-3 z990 ICB-4
G5/G6 ISC
1 Gbps
Compatibility
n/a n/a n/a
z800/z900 ISC-3
2 Gbps
Peer Mode
n/a n/a n/a
z890/z990 ISC-3
2 Gbps
Peer Mode
n/a n/a n/a
G5/G6 ICB n/a
333 MBps
Compatibility
n/a n/a
z900 ICB-2 n/a Not Supported n/a n/a
z990 ICB-2 n/a Not Supported n/a n/a
z800/z900 ICB-3 n/a n/a
1 GBps
Peer Mode
n/a
z890/z990 ICB-3 n/a n/a
1 GBps Peer Mode
Recommendation
use ICB-4s
n/a
z890/z990 ICB-4 n/a n/a n/a
2 GBps
Peer Mode