IBM 8687 Installation Guide - Page 90
the RXE-100 Remote Expansion Enclosure.
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xSeries 440 - chassis 1 SMP Expansion cables Crossover Cat 5 cable (or connected to an Ethernet switch) xSeries 440 - chassis 2 Figure 3-6 Connecting the two x440s together in a 16-way configuration The two x440s are connected through the scalability port on each SMP Expansion Module and require the installation of four 3.5 m Remote I/O cables (part number 31P6102) to complete the configuration. Tip: These four additional cables are the same as the ones used to connect the RXE-100 Remote Expansion Enclosure. Key points relating to SMP Expansion Module cabling: The SMP Expansion Module ports cannot currently be used as high-speed interconnects for clustering purposes. The connections do not offer redundancy. If a connection is lost, the server will shut down or restart depending on your system's configuration. 76 IBM ^ xSeries 440 Planning and Installation Guide