HIMA HIMax, Системное руководство

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3 Product Description HIMax System
HI 801 001 E Rev. 4.01 Page 22 of 122
of structures. Additionally, other network components such as switches can be used. The
network components must have the following properties.
ƒ Support of 1 GB/s and Ethernet flow control
ƒ Sufficient storage space, such that all messages can be forwarded without any overflow.
The rejection of messages ís detected as system bus diagnostic errors in the processor
module's diagnostic display.
Hirschmann (Belden) SPIDER II Giga Switches are allowed.
In contrast to the line structure, the rack ID can be almost freely assigned in the network
structure. It is, however, required that the (redundant) processor modules are inserted in
rack 0 and 1. The racks 0 and 1 must be directly connected to one another, i.e., only via
cable or via cable and media converter, if both are provided with processor modules or
responsible system bus modules. The connection may have a maximum latency of 10 µs.
HIMA recommends to also connect racks 0 and 1 directly, even if only rack 0 contains
processor modules. Thus, a later expansion with processor modules in rack 1 is possible.
Ethernet ring structures are not allowed for the system bus. The network path of a module
to a processor module must always be unique, i.e., components with alternative path are
not allowed.