HP X.25 for OpenVMS Alpha and I64 Systems, V2.0

HP X.25 for OpenVMS Alpha and I64 Systems, V2.0 SPD 47.37.16
This interface enables an application program using
OpenVMS System Services to communicate with com-
plementary X.25 software on other HP or non–HP sys-
tems.
Terminal Communications
HP X.25 for OpenVMS supports terminal communica-
tions according to ITU/TSS recommendations X.3, X.28,
and X.29. Only those terminal parameters defined in the
X.3 recommendation are explicitly supported. Network–
specific enhancements or extensions to the X.3 param-
eters are available at both the X.29 programming and
the host–based PAD user interface. Terminal processes
that depend on these extensions may not function cor-
rectly when used on other PSDNs or when accessing
one PSDN via another (for example, international ac-
cess).
The X.29 interactive terminal interface allows re-
mote asynchronous terminals (character–mode DTEs)
connected to the network to communicate with the
OpenVMS system in a manner similar to local termi-
nals. The maximum number of terminals supported on
a OpenVMS Alpha system (both local and X.29 remote)
cannot exceed the number for which the system has
been configured.
When using applications designed for interactive, local
terminal operations, transmission delays or PAD param-
eter settings can cause inconsistencies between incom-
ing X.29 traffic and the application’s operation. It may
be necessary to make modifications to the application
user interface or alter PAD parameter settings.
The X.29 interface includes a programming capability
for the support of specific X.29 signaling requirements,
including modification of PAD parameters.
Accounting
Accounting information is collected and is made avail-
able to the user via a report writing utility.
For incoming X.29 calls, no information can be retrieved
relating to the process or account onto which a user is
logged.
Security
An extensive security facility is provided. Control of re-
mote access to the system (incoming security) and local
access to the network (outgoing security) are supported.
Incoming and outgoing security can be based on any
combination of:
• Normal or reverse charging
• DTE number
• Network (PSDN)
• Process (or user) making the outgoing call
• Application handling the incoming call
Network Management
The Network Control Language (NCL) is provided for
the management of HP X.25 for OpenVMS and
DECnet-Plus. NCL provides network management fa-
cilities to:
•Define outgoing call destinations
•Define incoming call handling
• Modify X.25 frame and packet levels parameters
•Define security parameters
• Modify network configuration
• Monitor connection statistics
• Perform network maintenance functions
The network manager can be notified of significant net-
work events such as security violations or network fail-
ures through the event logging facility.
Problem solving is facilitated by the Common Trace Fa-
cility (CTF) provided with the OpenVMS operating sys-
tem. CTF enables the user to trace and analyse frames
passing between the PSDN and the X.25 \for OpenVMS
systems. In V1.5, the Common Trace Facility (CTF) for
OpenVMS X.25 functionality has been updated to match
the functionality of PSI Trace for the OpenVMS VAX
X.25 product. This includes the following capabilities:
• The ability to trace a circuit given the NWA device
name
• The ability to trace an X.29 port
• The ability to trace an individual X.25L3 circuit
Communications Interfaces for Alpha
Refer to the tables in this Software Product Descrip-
tion and consult your local hardware service provider
for complete information on the synchronous controller
cards supported by HP X.25 for OpenVMS Alpha Sys-
tems, as well as a list of the relay/connector nodes that
may be used as X.25 gateways to the LAN.
Note: X.25 on I64 does not support synchronous de-
vice drivers and synchronous communications options.
In addition to the devices listed in this Software Product
Description, operation over CSMA/CD (ISO 8802/3) and
FDDI (ISO 9314) networks is supported via the LLC2
protocol or via TCP/IP using RFC 1613.
Wide Area Network (WAN) Device Drivers
The WAN device drivers included in X.25 for OpenVMS
Alpha Systems support synchronous communications.
The device drivers all offer a supported user ($QIO) in-
terface.
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