2.5.3 USB subsystem
The Power E1080 has no integrated USB controlled or ports in the system nodes. The USB PCIe adapter must be used for enabling USB access. The PCIe2 2-PORT USB 3.0 LP adapter (#EC6J) is supported in the system node. This adapter typically is placed in the PCIe Slot 4/5 of system node1 or node2.
A USB Cable (#EC6N) is used for connecting the #EC6J adapter port to the rear side USB port in the system control unit (SCU), which is internally routed to a front-accessible USB port on the SCU (see Figure 2-22).
Figure 2-22 Rear view of the SCU showing the USB port for connection
The following USB devices are supported and available for the Power E1080:
Ê #EUA5 – Standalone USB DVD Drive with cable
Ê #EUA4 – RDX USB External Docking Station
90 IBM Power E1080: Technical Overview and Introduction
The front view of SCU in which the System USB port and FSP USB ports are highlighted is shown in Figure 2-23.
Figure 2-23 Front view of SCU showing System USB port and FSP USB ports
2.5.4 PCIe slots features
Each system node provides 8 PCIe Gen5 hot-plug enabled slots; therefore, a 1-node system provides eight slots, a 2-node system provides 16 slots, a 3-node system provides 24 slots, and a 4-node system provides 32 slots. You can connect up to four I/O expansion drawer features EMX0 per node with the slot capacity that is listed in Table 2-14.
Table 2-14 PCIe slots availability for different system nodes configurations
Each I/O expansion drawer consists of two Fanout Module features EMXH, each providing six PCIe slots. Each Fanout Module connects to the system by using a pair of CXP cable features. The CXP cable features are listed in Table 2-15. The RPO Only cables in this list are not available for ordering new or MES upgrade but for migration from a source system. Select a longer length feature for inter rack connection between the system node and the expansion drawer.
Table 2-15 Optical CXP cable feature
Chapter 2. Architecture and technical overview 91
The one pair of CXP optical cables connect to a system node by using one 2-ports PCIe optical cable adapter feature EJ24 placed in the CEC.
The CXP optical cable pair and the optical cable adapter features are concurrently maintanable. Therefore, careful balancing of I/O, assigning adapters through redundant EMX0 expansion drawers, and different system nodes can ensure high-availability for the I/O resources assigned to partitions.
Note: At the time of this writing, feature EMXH is the only supported or orderable fanout module. Previous fanout module features EMXF and EMXG are not supported on Power E1080 system.
For more information about internal buses and the architecture of internal and external I/O subsystems, see 2.5, “Internal I/O subsystem” on page 83.