Introduction to Tandem X.25 Capabilities

X25AM Connectivity
Tandem X.25 Features and Capabilities
2–30 065307 Tandem Computers Incorporated
Connecting to LANs
through TCP/IP
A local area network (LAN) generally connects computer systems, workstations, or
devices within a limited geographical area, such as within a building or a group of
buildings. The Transmission Control Protocol/Internet Protocol (TCP/IP) is a de facto
standard protocol used for multi-vendor LAN communications.
Tandem TCP/IP connects Tandem NonStop systems to many other computer systems:
UNIX systems — including the Integrity S2 (Tandem fault-tolerant UNIX system),
Sun and Hewlett-Packard workstations
personal computers — DOS-based and Macintosh
various large systems— including systems manufactured by Cray Research,
Digital Equipment Corporation, Unisys, and IBM
Tandem’s TCP/IP product provides a common application interface for both LAN and
WAN communications, because it runs over the X25AM subsystem (Figure 2-18).
To enable TCP/IP to run over an X25AM line, you must configure an X25AM
subdevice for the PTP (process-to-process) protocol. If you want to use TCP/IP for
both LAN and WAN connectivity, your system must be configured with at least two
controllers:
one of the 3650/6100 family controllers (3605, 3650 CSS, 6105, or 6100 CSS), or a
dedicated bit-synchronous controller (3604, or 6203/4) for the X25AM line(s)
the 802.3/Ethernet or 802.4 LAN controller for the LAN communications