Specifications

Chapter 2. Architecture and technical overview 43
Draft Document for Review May 12, 2014 12:46 pm 5102ch02.fm
2.4.2 System ports
The system planar has one serial port that is called system port. When an HMC is connected
to the server, the integrated system port of the server is rendered non-functional. In this case,
you must install an asynchronous adapter, which is described in Table 2-16 on page 49, for
serial port usage:
򐂰 Integrated system port is not supported under AIX or Linux when the HMC ports are
connected to an HMC. Either the HMC ports, or the integrated system port can be used,
but not both.
򐂰 The integrated system port is supported for modem and asynchronous terminal
connections. Any other application using serial ports requires a serial port adapter to
be installed in a PCI slot. The integrated system ports do not support IBM PowerHA
configurations.
򐂰 Configuration of the integrated system port, including basic port settings (baud rate, and
so on), modem selection, call-home and call-in policy, can be performed with the
Advanced Systems Management Interface (ASMI).
2.5 PCI adapters
This section covers the various types and functionality of the PCI adapters supported with the
IBM Power S822 system.
2.5.1 PCI express
Peripheral Component Interconnect Express (PCIe) uses a serial interface and allows for
point-to-point interconnections between devices (using a directly wired interface between
these connection points). A single PCIe serial link is a dual-simplex connection that uses two
pairs of wires, one pair for transmit and one pair for receive, and can transmit only one bit per
cycle. These two pairs of wires are called a
lane. A PCIe link can consist of multiple lanes. In
such configurations, the connection is labeled as x1, x2, x8, x12, x16, or x32, where the
number is effectively the number of lanes.
The PCIe interfaces supported on this server are PCIe Gen3, capable of 16 GBps simplex
(32 GBps duplex) on a single x16 interface. PCIe Gen3 slots also support previous
generations (Gen2 and Gen1) adapters, which operate at lower speeds, according to the
following rules:
򐂰 Place x1, x4, x8, and x16 speed adapters in same connector size slots first, before mixing
adapter speed with connector slot size.
Remember: Slot 7 (P1-C10) comes with PCIe2 LP 4-port 1 Gb Ethernet Adapter (#5260)
installed. In case this slot is needed, the adapter must be moved to another suitable slot or
replaced by another ethernet adapter.
Remember: The integrated console/modem port usage just described is for systems
configured as a single, system-wide partition. When the system is configured with multiple
partitions, the integrated console/modem ports are disabled because the TTY console and
call home functions are performed with the HMC.