Specifications

Chapter 2. Architecture and technical overview 63
2.4.5 Software licensing and CoD
For software licensing considerations with the various CoD offerings, see the most recent
revision of the Capacity on Demand User’s Guide at:
http://www.ibm.com/systems/power/hardware/cod
2.5 CEC Enclosure interconnection cables
IBM Power 770 or 780 systems can be configured with more than one system enclosure.
The connection between the processor cards in the separate system enclosures requires
a set of processor drawer interconnect cables. Each system enclosure must be connected
to each other through a flat flexible SMP cable. These cables are connected on the front of
the drawers.
Furthermore, service processor cables are needed to connect the components in each
system enclosure to the active service processor for system functions monitoring.
These cables connect at the rear of each enclosure and are required for two-drawer,
three-drawer, and four-drawer configurations.
The star fabric bus topology that connects the processors together in separate drawers is
contained on SMP Flex cables that are routed external to the drawers. These flex cables
attach directly to the CPU cards at the front of the drawer and are routed behind the front
covers of the drawers.
For performance reasons, there will be multiple link connections between the CEC
enclosures, and there will be differences in SMP Flex cabling between the two SCM
processor card configurations (#4983, #4984, #5003) and the four SCM processor cards
configurations (#EP24).
The SMP and FSP cable features described in Table 2-14 are required to connect
the processors together when system configuration is made of two, three, or four
CEC enclosures.
Table 2-14 Required flex cables feature codes
The cables are designed to support hot-addition of a system enclosure up to the maximum
scalability. When adding a new drawer, existing cables remain in place and new cables are
added. The only exception is for cable #3711, which is replaced when growing from a
2-drawer to a 3-drawer configuration.
CEC enclosures SMP cables for the
0-12 core (#4983) and
0-16 core (#4984)
processor cards
SMP cables for the
0-24 core (#EP24)
processor cards
FSP cables
Two #3711 and #3712 #3715 and #3716 #3671
Three #3712 and #3713 #3715, #3716, #3717 #3671 and #3672
Four #3712, #3713, #3714 #3716, #3717, #3718 #3671, #3672, #3673
Note: The #3712 and #3716 provide two SMP cable sets, and #3714 and #3717 provide
three SMP cable sets.