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X-25
TWICEŽ X.25
customers receive an unprecedented X.25 network certification
guarantee. Our clients benefit from their investment in PacketWare technology because they know they can rely on us for a complete
range of protocol software including
Frame Relay,
TCP-IP and
PPP.
TWICEŽ X.25 is based on 17 years experience
developing performance communication software to the open Streams
architecture with the quality guaranteed by PacketWare's rigorous
development methodology, audited and compliant with both government
and laboratory standards.
TWICEŽ X.25 complements PacketWare's comprehensive line of portable communication software
products to provide access to X.25 networks.
Features and Benefits
- Full STREAMS compatibility for
implementation in a native UNIX System V Release 3 or 4
kernel
- Portable Streams Environment (PSE) for
platforms which do not support a native Streams environment
- Full compatibility with UIT-T and ISO
standards, including UIT-T 1993 X.25
- Included Sub-Network Dependent
Convergence Functions (SNDCF) module allowing connection less
network Layers (IP, CLNP, ...) to access X.25 services
- Included Asynchronous HDLC module for
operation over asynchronous lines
- Full dynamic run-time configuration
per interface
- Extensive local network management
functions (configuration, line monitoring, statistics, and alarms
handling)
- Comprehensive porting and testing
Toolkit
Technical Specifications
Sub-Network Dependent Convergence
Functions (SNDCF)
- Connection Less DLPI user
interface
- Full compliance with all encapsulation
modes defined in RFC 1356
- Address mapping through local mapping
tables or DDN algorithm. Can be disabled for direct addressing
mode
- Full support for Idle and Holding
timers
X.25 Packet
Level
- Full support for UIT-T 1980, 1984,
1988, and 1993 standards
- Full support for ISO 8208 standard,
including all additional timers
- Up to 4096 PVCs and or SVCs per
physical line
- DTE or DCE (point to point only) modes
of operation
- Modulo 8 or modulo 128
numbering
- Automatic run time parameters
negotiation through Registration packets
- Full support for Reject packets and
packet retransmission
- Extended address format support
- Extensive listening facilities to wait
for incoming calls with flexible listening criteria on called and
calling addresses and user data
- Extensive local network management
functions (configuration, line monitoring, statistics, billing
records generation, and alarms handling)
X.25 Frame
Level
- Full support for UIT-T 1980, 1984,
1988, and 1993 standards
- Full support for ISO 7776
standard
- DTE or DCE modes of operation with
optional automatic selection at run time
- Modulo 8 or modulo 128
numbering
- Support for LAP-B and LAP-D protocols
and frame formats
- Extensive local network management
functions (configuration, line monitoring, statistics, and alarms
handling)
Asynchronous HDLC
(AHD)
- Software HDLC framing and transparency
for operations over an asynchronous line
- Compliant with RFC 1662 and OSI 3309,
Addendum 2, 1992 standards
Serial
Driver
- Synchronous HDLC mode of
operation
- Asynchronous mode of operation for
framing oriented Upper Layers (SLIP, AHD, or PPP)
- UIT-T V.25bis dial up support
- Flexible junction signal monitoring
functions
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