NPI
STREAMS Driver for X.25 Packet Level
- Implements AT&T NPI Ver. 1.3
- STREAMS multiplexor driver
- Compatible with UNIX 5.3 and 5.4,
QNX and Linux
- Network management support
- Least-cost call routing with retries
- X.25 packet level facilities supported
- X.25 virtual circuits can be used
as IP interfaces
- Uses DLPI to interface to frame level
below
back
to contents
DLPI
STREAMS Driver for X.25 Frame Level
- Implements DLPI Ver 2.0.0
- STREAMS Multiplexor driver
- Compatible with UNIX 5.3 and 5.4,
QNX and Linux
- Network management support
- Uses CDI to interface to physical
line driver below
- Supports X.25 LAPB single link and
multilink
back
to contents
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
back
to contents
X.25
Standards
- CCITT X.25 1980, 1984, 1988
- DDN compatible
back
to contents
X.25
Line Level Features
- Maximun frame size
- Watchdog timer on transmissions
- Inter-frame delay 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
back
to contents
X.25
Frame Level Features
(see also DLPI
HDLC/SDLC/LAPD/LAPB)
- DTE/DCE
- Frame level window
- Max frame size
- T1, T2 and T3 timers supported
- Retransmission limit (N2)
- Mod 8/128 sequence numbers
- Active/passive link setup
- Use of DISC optional
- SREJ option
- Modem signal monitoring
- Loopback mode for testing
- LAP/LAPB
- Idle RRs optional
- Trace buffer for frames
- Frame level may be used directly
by user (no packet level)
- Frame counts by frame type
- I-fields bytes transmitted/received
back
to contents
X.25
Packet Level Features
- All X.25 facilities allowed via
registration packets
- Normal/extended sequence mode
- Window, packet size negotiated
- Throughput class negotiated
- Packet REJ: DTE and DCE
- Incoming/outgoing calls barred
- One way logical channels
- Closed user group
- Reverse charge acceptance
- Fast select acceptance
- Charging Information
- D-bit support, D-bit modification
- Local charging prevention
- Fast select
- Logical channel range negotiable
- Diagnostic packet
- CCITT 1980, 1984, 1988
- Optional 1988 TOA/NPI addressing
using A-bit
- Default and max packet sizes
- Default window size
- PVC/SVC, DTE/DCE
- Segment size and charging rate parameters
- Segment size and charging rate parameters
- Loopback option for testing
- Restart timer (T20/R20, T10/R10)
- Call timer (T21, T11)
- Reset timer (T22/R22, T12/R12)
- Clear timer (T23/R23, T13/R13)
- Registration timer (T28/R28)
- Packet counts by packet type
- Data byte counts
- Trace buffer for packets
back
to contents
Printer-friendly PDF
|
