Link Layer Specifications Supported

Contents

DLPI STREAMS Driver
CDI STREAMS Driver
LAPB/LAPD/LLC Frame Level Protocol
SDLC/HDLC Protocol
X.25 Line Level Features

Summary

  • DLPI HDLC/SDLC/LAPD/LAPB
  • AT&T compatible interface - Supports the Data Link Provider Interface (DLPI) protocol to the user
  • LAPB conforms to CCITT X.25 1988
  • LAPD conforms to CCITT Q.921 1988
  • SDLC and LLC are compatible with IBM front end processors
  • System administration - Utilities for configuring the software and obtaining statistics and trace information

Gcom provides protocol solutions to connect legacy systems to TCP/IP networks. Protocols: SNA, X.25, Bisync, Frame Relay, LAPB, LAPD, HDLC, SDLC, and more. Operating systems: Windows, Linux, Unix, Solaris, Solaris Intel, QNX, and more. Hosts: Any TCP/IP/Ethernet-capable host (IBM, Unisys, Tandem, HP mainframes...), PCs, Intel PCs, SPARC or Sun workstations, and more. End-user devices: ATMs, POS, radar terminals, and more.
Streams Model

DLPI Streams Driver for LAPB/LAPD/LLC and SDLC

  • Implements AT&T DLPI Ver 2.0.0
  • STREAMS Multiplexor driver
  • Compatible with UNIX 5.3 and 5.4, QNX and Linux
  • Supports all DLPI connection oriented primitives
  • QOS not supported
  • Supports TEST, XID and UI frames
  • Protocol support for SDLC, HDLC, LAPB and LAPD
  • Network management support
  • Uses CDI to interface to level 1
  • Device drivers and interface board included

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CDI STREAMS Driver for Physical Line Driver

  • STREAMS device driver
  • Compatible with UNIX 5.3 and 5.4, QNX and Linux
  • Network management support
  • Drivers for a variety of synchronous boards

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Frame Level Protocol

  • CCITT 1988 X.25 LAPB
  • CCITT 1988 Q.921 LAPD
  • IBM front end compatible LLC
  • Options for TEST, XID and UI frames
  • Option for SREJ
  • Option for automatic DTE/DCE role determination
  • T1, T2 and T3 timers supported
  • N1 (max bytes per I-frame)
  • N2 (max time outs)
  • W (window size)
  • Normal (mod 8) or extended (mod 128)
  • Active/passive link setup
  • Modem signal monitoring
  • Loopback mode for testing
  • LAP/LAPB/LAPD
  • Idle RRs optional
  • Trace counts by frame type
  • Frame counts by frame type
  • I-field bytes transmitted/received

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SDLC/HDLC Protocol

  • NRM Primary
  • NRM Secondary
  • ARM
  • ABM
  • Option for full duplex polling
  • Option for group polling
  • Supports SREJ
  • T1 timer supported
  • N1 (max bytes per I-frame)
  • N2 (max time outs)
  • W (window size)
  • Normal (mod 8) or extended (mod 128)
  • Extended addresses supported
  • SDLC style addresses supported
  • TEST, XID, UI frames
  • RIM, SIM frames
  • RD, UP frames
  • Modem signal monitoring
  • Loopback mode for testing
  • Trace buffer for frames
  • Frame counts by frame type
  • I-field bytes transmitted/received

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X.25 Line Level Features

  • Maximum frame size
  • Watchdog timer on transmissions
  • Inter-frame delay option
  • Line turnaround delay option
  • Half duplex RTS/CTS option
  • Oscillation detection for modem signals
  • Line level may be used directly by user (no frame level)
  • Statistics: CRC errors, underruns, overruns, aborts, number of bytes transmitted/received, others

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