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6-2 MAX 6000/3000 Network Configuration Guide
Configuring X.25
Introduction to Lucent X.25 implementation
WWW pages with graphics, or X.25 Transaction Processing Protocol for Point of Service
(T3POS) sends transaction data over the D channel.)
Introduction to Lucent X.25 implementation
This chapter describes how the MAX unit supports X.25. The CCITT Blue Book
Recommendation X series 1988 has full technical specifications for X.25, X.3, X.28, X.29, and
Link Access Protocol–Balanced (LAPB). IETF RFC 1356 has the technical specification for
IP over X.25 (X25/IP).
X.25 is a connection oriented (virtual circuits) protocol, providing services such as
multiplexing, in-sequence delivery, transfer of addressing information, segmenting and
reassembly, flow control, error control, reset, and restart. Allocation of logical channels can be
either static (PVC) or dynamic (SVC).
Configuring the unit to communicate with an X.25 network involves the following elements:
• A physical interface to the X.25 network. This can be a nailed serial-WAN, one of the D
channels in T1 or E1 PRI, or a BRI D channel connection. The MAX unit supports only
one physical X.25 connection. (To configure the interface, see Chapter 3, “Configuring
WAN Access.”)
• A logical data link to the X.25 network. Defined in an X.25 profile, the link should
normally be set in DTE.
• Dial-in connections (defined in Connection profiles) may use X.25. The application layer
of an X.25 connection can be a TCP/IP network connection or terminal emulation using
X.25 Packet Assembler/Disassembler (PAD).
The unit supports PPP encapsulation over X.25 as defined in RFC 1598. Using PPP/X.25
instead of IP/X.25, offers several advantages, in that it supports:
• STAC compression
• PAP/CHAP authentication
• Multiprotocol encapsulation, including: IP routing, IPX routing, Appletalk routing, and
bridging
Configuring the logical link to an X.25 network
An X.25 profile defines the logical data link between the MAX unit and a remote X.25
network. The Ethernet > X.25 > X.25 profile includes the following parameters that define
setting the profile’s name, making the profile available for use, setting the type of connection
for the call, defining a group number for the serial WAN connection, the data service type for
the link:
Parameter Specifies
Name The profile’s name. The name must be unique and cannot exceed 15
characters.
Active That the profile is available for use.