Specifications

The ULTRIX Operating System, Version 4.5 SPD 26.40.32
ULTRIX VAX supports communication over full- and
half-duplex point-to-point DDCMP synchronous lines.
DMC mode is provided for backwards compatibility. This
feature is not available on ULTRIX RISC systems.
•
Ethernet Support
Ethernet Support allows for Ethernet communication us-
ing the TCP/IP network protocols, ThinWire, baseband
and, optionally, the Digital DNA network protocol, if
either DECnet–ULTRIX or DECnet/OSI for ULTRIX is
present (refer to SPDs 26.83.xx and 34.97.xx, respec-
tively). All protocols can operate concurrently on a sin-
gle physical Ethernet link.
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CI Network Support
CI Network Support allows for Computer Interconnect
(CI) host to host communication using the network sup-
port TCP/IP network protocols. The CI network is well
suited for Network File System (NFS®) traffic and can
be used to offload the Ethernet of NFS traffic.
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X.25 Driver Support
X.25 Driver Support allows for X.25 wide area network
device support.
ULTRIX VAX supports uucp and tip operations over
an X.25 public packet switching network using a MI-
COM Micro 800/X.25 Concentrator PAD device attached
to one of the supported asynchronous communications
multiplexers. This feature is not available on ULTRIX
RISC systems.
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FDDI Support
FDDI Support provides fiber optic support for the DEC-
system and DECstation 5000 systems.
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Name Services
ULTRIX supports the BIND V4.8 and HESIOD name ser-
vices. The BIND service provides a host name and ad-
dress lookup service for the Internet network. HESIOD
is layered on top of BIND and provides a more generic
name service. The user can use HESIOD/BIND to re-
place or supplement the hosts, aliases, auth, group, net-
works, passwd, protocols, rpc, and services databases.
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XTI
XTI is a UNIX® version independent (BSD or System
V) network application programming interface. Most
networking applications are written to sockets since it
is available on most UNIX® systems. Over time, this
trend would shift to the System V interface. With XTI,
customers can write to a standard interface which will
use either streams or sockets.
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The Packet Filter
The packet filter is a software-driven network traffic mon-
itor which provides demultiplexing of networking packet
headers, as well as reception and transmission of pack-
ets containing user defined network protocols on an Eth-
ernet LAN. The packet filter functions as an Ethernet
Monitor and can be used to filter specific network pro-
tocols. The packet filter can also be used to send and
receive packets using protocols not currently supported
in the ULTRIX kernel.
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SNMP
Simple Network Management (SNMP) protocol man-
ages TCP/IP networks. ULTRIX supports the SNMP
Agent on both ULTRIX VAX and ULTRIX RISC systems.
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IBM® 2780/3780 Terminal Emulator
The IBM® 2780/3780 Terminal Emulator is an ULTRIX
software package that allows the user’s system to em-
ulate a 2780 or 3780 IBM terminal. The 2780/3780 Ter-
minal Emulator uses the Binary Synchronous Communi-
cations (BSC) protocol to send and receive files across
a communication line connected to an IBM system that
supports 2780/3780 devices.
The Digital devices that must be used on the VAX and
MicroVAX based systems for the ULTRIX 2780/3780
Terminal Emulator are noted in the
OPTIONAL HARD-
WARE
section of this Software Product Description.
This package is not available on ULTRIX RISC systems.
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Local Area Transport Support
The Local Area Transport (LAT) protocol supports com-
munication with service nodes on the same Ethernet.
Software that runs on local area terminal servers is-
downloaded over the Ethernet network from either a
Phase IV or Phase V loadhost or any valid ULTRIX load
host. A single ULTRIX host may support up to 256 si-
multaneous LAT sessions.
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