Bull Escala EPC400 Connecting Manual page 128

Figures 69 and 70 illustrate disaster recovery solutions which differ in terms of number of
nodes and shared SSA cabinets. They are extensions of configurations SSACF01 and
SSACF02. In these extended configurations two physical loops are implemented.
Figure 69 shows an implementation with one SSA cabinet per loop, Figure 70 with two
cabinets per loop. In the first case, there is an extended optic fibre link between each node
and the distant cabinet. In the second case, there is an extended optic fibre link between the
two distant cabinets of each loop.
For a system administration standpoint, the Powerconsole and a Console Concentrator can
be connected to the public network or the private network. The network type must be
Ethernet. The nodes are linked via serial lines to the console concentrator. For the nodes
which are distant, the serial lines need to be extended with the use of micro modems. If the
number of distant nodes is more than 2, a second console concentrator near to those nodes
can be used. In that case the distant nodes are wired to the second concentrator which in
turn is connected to the first one via an extended serial line.
Figure 69. Optic Fibre Extender: Global diagram (1 pair of 2 nodes, 1 cabinet).
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