X.25

» 

HP Integrity and HP 9000 server connectivity home

» HP Servers home
» Technical Support
» Buy online from HP
» Section map
 
Content starts here
For HP Integrity servers, HP 9000 enterprise business servers, HP 9000 workstations, and HP visualize workstations

Product Brief
Product Number J2793B

» Features and Benefits
» Functional Description
» Supported X.25 Network Parameters
»Certification Requirements
» Configuration Requirements
» Installation Policy
» Ordering Information
» Documentation

HP X.25 Software for HP 9000 Enterprise Business Servers, HP Integrity, HP 9000 Workstations, and HP Visualize Workstations provide a network connection to private and public X.25 networks in conformance with the 1980/1984/1988 CCITT recommendations. This product allows communication between HP Integrity/HP 9000 servers, as well as between the HP Integrity/HP 9000 servers and other systems or telecommunications equipment (HP or non-HP). The communication is achieved through the use of Legacy X.25 protocol, Internet Services and Transport (TCP/IP), OSI Services and Transport, SNA over QLLC*, or UNIX®-to-UNIX® copy protocol (UUCP).

*Requires HP X.25 HW Card (J3525A). Not supported with HP Integrity i2 and i4 Servers.

HP X.25 Software provides a programmatic interface for direct access to X.25 packet layer 3 (using Berkeley Sockets). This allows customers to develop their own protocols and services for communication with remote devices (computers or telecommunications equipment) over an X.25 or TCP/IP network. Remote display terminals and remote PAD printers are supported through implementation of host PAD capability conforming to the CCITT recommendations X.3 and X.29. Host PAD emulation and remote printing capabilities are also supported.

HP X.25 Software supports X.25 over LLC2 (XOL). XOL allows X.25 layer 3 to connect to DLPI instead of LAP-B and provides the X.25 functionality on top of LAN cards such as Ethernet, FDDI*, and TokenRing*.

*FDDI and TokenRing are supported with HP-UX 11iv1 only.

HP X.25 software supports X.25 over TCP (XOT), which is based on RFC 1613. XOT allows X.25 layer 3 to connect to TCP/IP stack instead of LAP-B and provides X.25 functionality on top of a TCP/IP infrastructure. It is provided on HP-UX 11i v3 September, 2011 release onwards.

HP X.25 Software is designed to deliver high performance figures, especially when used with high-speed communication interface cards for legacy X.25 protocol (with line speeds up to 2 Mb/s)*.

*HP X.25 HW Card (J3525A). Not supported on HP Integrity i2 and i4 servers.

HP X.25 software has a flexible product structure and can operate with different hardware serial interface cards. It allows the building of X.25 connectivity solutions tailored to a broad range of customers' requirements, such as:

  • A low-cost solution for connecting a large number of remote sites (small branch offices, points of sale) to a corporate server.
  • A high-performance WAN connectivity for HP Integrity/HP 9000 servers and workstations running very demanding networked applications, namely, in the telecommunications environment (OSS, BSS, or AIN applications), or for large online information servers.

Features and benefits

Compliance with international and industry standards

  • Supports Internet Services for HP Integrity/HP 9000-to-HP Integrity/HP 9000 or HP Integrity/HP 9000-to-non-HP computer communication.
  • Complies with the U.S. Defense Data Network (DDN) TCP/IP-X.25 standard protocol (RFC 877).
  • Complies with the 1980/1984/1988 CCITT and ISO 8208 recommendations for X.25 protocol.
  • Certified on major public and private X.25 networks.
  • Supports OSI Services (FTAM, MMS, X400, CMIP, and XTI programmatic interface) for HP Integrity/HP 9000 servers and workstations over the OSI Transport/9000 software.
  • Supports X.25 layer 3 interoperability for communication between HP Integrity/HP 9000 systems and other systems (HP or non-HP).
  • Supports HP NFT (Network File Transfer) protocol for HP Integrity/HP 9000-to-HP 3000/V or HP Integrity/HP 9000-to-HP 3000/XL communication.
  • Supports HP-UX SNAPlus Services over the SNAPlus Link transport (QLLC protocol).
  • Supports X.25 over LLC2 (XOL), allows HP Integrity customers to run X.25 applications using Ethernet cards, instead of PSI (Programmable Serial Interface) cards.
  • Supports X.25 over TCP/IP (XOT), allows HP Integrity customers to deploy X.25 applications over a TCP/IP network (without the need of a dedicated X.25 HW card). This conforms to RFC 1613.
  • TCP/IP, SNA, OSI, and proprietary protocols designed on top of the X.25 packet layer (level 3) programmatic interface can run concurrently over the same X.25 link.

SW-based deployment for XOT

  • XOT supports Switched Virtual Circuits and Permanent Virtual Circuits.
  • XOT Supports up to 1024 virtual circuits per interface port.
  • Up to 10 XOT interfaces are supported per system.
  • The local and remote fail-over feature is supported over the XOT interface in a Servicegaurd environment.
  • XOT protocol is supported on HPVM environment.
Customized applications support
  • Provides a programmatic user interface for direct access to X.25 level 3 (packet layer) for multivendor and customer-designed communications via Berkeley Sockets.
Transparent access over multiple nodes and networks
  • Dynamic packet routing and gateway capabilities through the use of Internet Services over Internet Protocol (IP).
  • Dynamic packet routing and gateway capabilities through the use of OSI communication protocol (OTS/9000 transport).
  • Provides an interface with UUCP.
Cost-effective remote terminal connections
  • Implementation of host PAD capability (compliant with 1984 CCITT recommendations X.3 and X.29) for support of remote display terminals and printers.
  • Provides PAD emulation for incoming and outgoing access.
X.25 link management capability
  • Provides programmatic access to X.25 link status information (compliant with the RFC 1381 and 1382 standards for X.25 MIB2 specification).
Ease of use
  • Menu-driven configuration.
  • Extensive diagnostics tools.

Functional description

System-to-System communication
An HP Integrity/HP 9000 server with the X.25 link is capable of simultaneously sending calls to and receiving calls from other computers (HP or non-HP) over an X.25 or TCP/IP network.

When operating over public or private X.25 networks, it can be configured as a DTE, with line speeds up to 2 Mb/s, depending on the specification of the hardware serial interface card. When operating over point-to-point lines, the product can also be configured as a DCE. Point-to-point communication requires the use of modems or modem eliminators.

Applications can be designed in several ways:

  • Using TCP/IP communication architecture. All Internet Services supported by HP on HP Integrity/HP 9000 servers can be used on top of the X.25 link.
  • Using OSI communication architecture. In this case, the OTS/9000 HP product must be installed on top of X.25. All OSI services provided by HP on HP 9000 servers and workstations are supported.
  • Using SNA communication architecture. Here, the SNAPlus link product (P/N J6380AA) must be installed on top of X.25. All SNA services provided by HP on HP 9000 servers and workstations are supported.
  • Using custom-designed proprietary protocol. In this case, the X.25 software product provides a message-based programmatic interface to the X.25 packet layer (level 3) to establish connections with remote HP or non-HP computers or telecommunications equipment. This programmatic access (through Berkeley Sockets) consists of routines that are accessible via C programs.

Remote terminal connection
Remote asynchronous character mode HP terminals connected to public or private PADs, such as the HP2335A, can transparently access any HP Integrity/HP 9000 server over the same X.25 line. This feature is provided through the implementation of 1984 CCITT recommendations X.3 and X.29.

The product provides a high level of security and flexibility for remote PAD terminal access. Using a configuration of calling or called X.25 addresses and sub addresses, the product can launch specific applications based on X.25 addresses or Call User Data contents.

Remote printer connection
HP X.25 Software allows the HP Integrity/HP 9000 server to print data at a remote printer connected to a PAD. The software handles all of the CCITT (1984 version) protocol considerations to allow the LP spooling system to treat the remote PAD printers as though they were connected locally. Any printer supported by the LP spooling system and the remote PAD may be used.

Terminal emulation
HP X.25 Software allows the computer user to work in terminal emulation mode and access any remote host computer (HP or non-HP) supporting PAD protocol communication (CCITT recommendations X.3, X.28, and X.29).

Supported X.25 network parameters for legacy X.25

Layer 1
The characteristics of the physical layer depend on the hardware serial interface card used with the HP X.25 software product. Layer 1 operates as a DTE. For details on hardware serial interface card, click here.

Layer 2

  • LAP-B protocol
  • Frame sizes: as required for layer 3 packet sizes
  • Window sizes: 1-7
  • Modulo 8 frame sequence numbering
  • Configurable maximum number of retransmissions (0-255)
  • Configurable retransmission timer (0.1 to 12 sec)
  • Operates as a DTE or DCE

Layer 3

  • One-way/two-way (incoming and out-going) switched virtual circuits (SVC)
  • Permanent virtual circuits (PVC)
  • Delivery confirmation bit (D-bit) for X.25 packet layer applications
  • Qualifier bit (Q-bit) for X.25 packet layer applications
  • More-data bit (M-bit)
  • Packet sizes: 16 to 4096 bytes
  • Window sizes: 1-7
  • Modulo 8 packet sequence numbering
  • Throughput class: 3 to 14
  • Operates as a DTE or DCE

Note: Layer 1 and Layer 2 configuration parameters are applicable on X.25 HW card based solutions only. For XOT/XOL based deployments, only Layer3 configuration parameters are applicable.

Certification requirements

Operation of the X.25 software connected to a public X.25 network may require certification. To obtain the most up-to-date list of X.25 public networks on which the HP X.25 Software is certified, contact your HP sales representative.

Configuration requirements

  • HP-UX operating system version 11.11 or later
  • Minimum free disk space for software installation: 25 Mbytes.
  • Supported servers: HP 9000, HP Integrity Superdomes, Integrity Superdome 2 servers and HP Integrity i2 and i4Servers (XOT only).
  • When operating HP X.25 Software with HP OSI Services, OTS/9000 (P/N 32070B) version C.04.03 or later is required for servers.

Installation policy

The customer is responsible for installation of the X.25 software product. Before installing the product, the customer must obtain, install, and verify the correct operation of any communication line, X.25 network access, or any other required equipment and facilities.

The customer must also verify correct installation of the hardware serial interface card on the HP Integrity/HP 9000 server before installing the X.25 software product.

Ordering information

J2793B: X.25 Software includes software, media, and documentation (User Guide, Programmer Guide, Release Notes, and Whitepaper).

The customer must also order:

  • One software license option:
    • J2793B#2AH: HP X.25 v2 for HP-UX Per-Core LTU
    • J2793B#404: HP X.25 v2 for HP-UX Per-Socket LTU
    • J2793BAE#2AH: HP X.25 v2 for HP-UX Per-Core E-LTU
    • J2793BAE#404: HP X.25 v2 for HP-UX Per-Socket E-LTU
    • J2793BAN#2AH: HP Integrity X.25 Software Migration to Per-Core Trade-in LTU
    • J2793BAN#404: HP Integrity X.25 Software Migration to Per-Socket Trade-in LTU

Documentation

» Back to top