home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Network Support Encyclopedia 13
/
Network Support Encyclopedia (Novell Inc.)(1991).ISO
/
download
/
nasx25.txt
< prev
next >
Wrap
Text File
|
1991-09-05
|
5KB
|
95 lines
NEWPORT SYSTEMS SOLUTIONS' X.25 COMMUNICATIONS INTERFACE
The X.25 Communications Interface (XCI) from Newport Systems Solutions,
Newport Beach, CA, provides X.25 connectivity for the NetWare Access Server
V1.2 allowing remote users to take full advantage of X.25 Public Switching
Networks (PSN):
Reduces Host Site Requirements
The XCI can multiplex 16 users on a single physical link to an X.25
network. In a fully configured Access Server, one synchronous modem and
line to the X.25 network replaces 16 separate asynchronous modems and
associated lines that would otherwise be required to accommodate 16 users.
The XCI requires only one slot in the Access Server, compared to the
asynchronous WNIM+ configuration that requires four slots.
Multiple Connection Options
Multiple connections options allow both remote PC users and remote LAN
users to access the Access Server.
- A remote PC or asynchronous terminal can dial into X.25 PADs
(Packet Assembler/Disassemblers), i.e., a remote PC running OnLAN/PC
can communicate via an asynchronous communications line and modem to
an X.25 asynchronous PAD, which in turn is connected to an X.25 PSN.
- A LAN workstation can run OnLAN/PC communicating via an asynchronous
communications server, which utilizes an asynchronous line and modem
communicating to an X.25 asynchronous PAD.
- A LAN workstation can dial directly into an X.25 network for a
communications path to the Access Server. This is done by running
OnLAN/PC communicating via a LAN X.25 gateway, which is connected to
an X.25 PSN via a synchronous communications line and modem.
Local Charges for End Users
Remote end users are charged for local access into the X.25 network instead
of for a long distance call to the central host site. Charges are for
connect time and amount of data sent, not for distance, which could be
extremely important for international companies. Both public and private
X.25 networks are supported in most foreign countries.
Support for Multiple Ports per WNIC
The WNIC supports two synchronous ports at speeds up to 64 Kbps per port.
Each port could support up to 16 users, although most users would employ
only one port for communications, saving the second port to connect to a
second X.25 network. If both ports are connected to the same X.25 network,
the number of users can be split over each port to provide more bandwidth
per user than is possible with only one port connected to the X.25 network.
The XCI ports support RS-232, RS-422, V.35 and X.21 line interfaces.
X.25 Configurator Included
All X.25 parameters are factory set to default values. An X.25
Configurator is included to allow customizing of X.25 parameters, if
necessary.
Additional X.25 Features
Some additional X.25 features supported by XCI are:
- Support for both Switched (SVCs) and Permanent Virtual Circuits
(PVCs).
- Automatic configuration of remote terminal profile to condition the
remote PAD for proper operation with the XCI.
- Configurable to accept or reject collect calls.
- Configurable for DCE (Data Circuit Equipment) operation to allow
direct connection without an intervening X.25 PSN.
- CCITT X.25 1988 compliant.
X.25 Statistic Utility
From the Access Server console, the user may display XCI operational
statistics and status by using a menu-driven program. X.25 link and packet
statistics are displayed side by side for a selected link. Port statistics
and status provide information about the current or last X.25 call to the
port. Links may also be enabled or disabled from this utility.
Automatic Installation
Utility automatically installs the XCI software. The NetWare Access Server
Generator (NASGEN) must be run after XCI installation.
Reliable Hardware Adapter
XCI software runs on the WNIC (Wide-Area Network Interface Coprocessor), a
16 bit coprocessor that uses one slot in a PC/AT. The WNIC has 512 Kbytes
of dual-ported RAM. The main on-board processor is a 10 Mhz, 16 bit NEC
V50 microprocessor with four channel DMA (Direct Memory Access) support.
Compatibility
The XCI can coexist in the Access Server with NetWare's WNIM+ or Newport
Systems Solutions' ACI (Asynchronous Communications Interface) product.
Novell Tested and Approved
XCI is Novell tested and approved. Newport worked very closely with Novell
during all phases of XCI development and verification to ensure complete
compatibility.