3 Product Description HIMax System
HI 801 001 E Rev. 4.01 Page 20 of 122
RJ-45 socket located on the connector boards of the system bus modules. System bus A
and system bus B must not be crossed or connected.
It is not allowed to interconnect the system busses of various different HIMax systems!
System bus cable characteristics
Twisted pair Ethernet cables
Cat. 5e or higher for 1 Gbit/s.
RJ-45 connector on both sides.
Industrial standard implementation, e.g., with Harting plugs.
Auto-Crossover allows the use of crossover and straight through cables.
Suitable cables are available from HIMA in standard lengths.
NOTE
System malfunction possible!
The system busses are not normal Ethernet connections. Therefore, the RJ-45 sock-
ets UP and DOWN and DIAG may only be used to connect to HIMax racks.
Do not connect the sockets UP and DOWN and DIAG to local networks or other de-
vices with LAN connection such as the PADT!
Never interconnect or cross system bus A and system bus B!
Operate a system bus in line structure either redundantly or not redundantly for all
racks!
The system bus located between base plates containing CPU modules or responsi-
ble system bus modules must be redundantly connected irrespective of its structure,
network or line.
The system bus can be organized in two different structures:
Line structure
That is the default structure.
Network structure
This structure allows one, if the appropriate network structure exists, to shut down and
replace a base plate during operation, without interrupting the connection to the other
base plates.
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