User`s guide

USER’S GUIDE
32 CyberSWITCH
SYSTEM COMPONENTS
The major components of the CyberSWITCH are:
• System hardware consisting of a platform and an administration port provided by the
platform.
• Four main categories of system software:
The boot device gains control at power-up. It runs diagnostics, downloads new versions of
operational software, and prepares the host processor for execution of operational software.
The flash file system stores a compressed image of operational software and I/O system
software. It also stores other necessary files for configuration and information storage.
The operational software provides system functionality, such as download and initialization of
the I/O subsystem. The I/O subsystem handles LAN I/O.
• Remote ISDN devices which interoperate with the system and allow device access to network
resources.
More detailed descriptions of system software and hardware are included in the next two chapters.
The following section describes remote ISDN devices.
REMOTE ISDN DEVICES
The CyberSWITCH provides a centralized concentrator function for remote ISDN devices. The
devices can be separated into the following categories:
• remote ISDN bridge devices
• PC based terminal adapters
• ISDN enabled workstations
• other ISDN routers
Typical remote ISDN bridges provide one Ethernet port and one basic rate ISDN port. The basic
rate port is connected to the switched digital network and is used to make connections to the
CyberSWITCH. The Ethernet port is used to connect to a remote LAN. The remote bridge device
sends Ethernet frames from devices on the remote LAN over the switched network.
PC-based terminal adapters connect to a remote personal computer and use the switched digital
network to connect to the system. The terminal adapter sends network protocol specific frames
from the host PC device over the switched network.
Workstation-based terminal adapters connect to a workstation and use the switched digital
network to connect to the system. The terminal adapter sends network protocol specific frames
from the workstation over the switched network.