IBM SG24-5131-00 manual Special Considerations, Serial RS232

2.2.2.2 Special Considerations

As for TCP/IP networks, there are a number of restrictions on non-TCP/IP networks. These are explained for the three different types in more detail below.

Serial (RS232)

A serial (RS232) network needs at least one available serial port per cluster node. In case of a cluster consisting of more than two nodes, a ring of nodes is established through serial connections, which requires two serial ports per node. Table 3 shows a list of possible cluster nodes and the number of native serial ports for each:

Table 5. Number of Available Serial Ports in Each Model.

RS/6000 Model		Number of Serial Ports Available
7006		11
7009	C10, C20	11
7012 Mod. 3XX and GXX		2
7013 Mod. 5XX		2
7013 Mod. JXX		3
7015	Mod. R10, R20, R21	3
7015	Mod. R30, R40, R50	3
7013,7015,7017 Mod. S7X		0 2
7024 EXX		11
7025	F50	2
7026 Mod. H50		3
7043Mod.		2
9076 thin node		23
9076 wide node		23
9076 high node		33
9076 thin node (silver)		23
9076 wide node (silver)		23

1serial port can be multiplexed through a dual-port cable, thus offering two ports

Cluster Planning 15