Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-X.25 Lines
Expand Configuration and Management Manual—523347-008
10-5
ServerNet Wide Area Network (SWAN) Concentrator
adapter (GESA). The G4SA is the only LAN adapter supported for the IOAM
enclosure, and it cannot be installed in a NonStop S-series enclosure. The data
transfer rate is limited to 10 Mbps when the G4SA is connected to a SWAN
concentrator, but a data transfer rate of 10/100 Mbps is possible when the G4SA is
connected to a SWAN 2 concentrator. For information about the G4SA, refer to the
LAN Configuration and Management Manual.
ServerNet Wide Area Network (SWAN) Concentrator
The SWAN concentrator is a communications device that provides wide area network
(WAN) connections. HP recommends that you configure the SWAN concentrator in the
same processor pair as the Expand line-handler processes.
For information about the SWAN concentrator, refer to the WAN Subsystem
Configuration and Management Manual.
Topology Considerations
An Expand-over-X.25 network must be configured as a logical fully connected mesh. In
a single-line path configuration, you configure one Expand-over-X.25 line-handler
process for each destination node in the network. In a multi-CPU configuration, you
configure multiple Expand-over-X.25 line-handler processes, usually in separate
processors, for each destination node in the network. In a multi-line path configuration,
you configure a path that consists of multiple lines between the source and destination
nodes.
In Figure 10-2, a single-line path is configured between node \A and node \C; a multi-
CPU path that consists two paths is configured between node \A and node \B; and a
multi-line path that consists of three lines is configured between node \B and node \C.