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Rules of Thumb
NetWare Asynchronous Communications Services v3.0 (NACS)
February 16, 1993
By allowing users to share communications resources connected to a NetWare
server, NACS provides asynchronous connectivity to multiple users on a
NetWare LAN. To aid you in configuring NACS for optimal performance,
reliability, and ease of use, we asked our engineers what components they
would use if they were installing NACS. Here's what they said.
Possible Applications of NACS
-----------------------------
LAN users can share asynchronous communications resources attached to the
NACS; such as modem connections, muxes, and direct asynchronous host lines,
thereby eliminating the need for separate modems or direct connections from
individual workstations.
Depending on the capabilities of the communications adapters installed in
NACS, users can transmit data at up to 115.2 Kbps. NACS works in
conjunction with NASI (NetWare Asynchronous Services Interface), to support
most common communications packages and terminal emulators. For a list of
known NASI compatible applications, refer to "NASI Compatible Applications"
below.
Supported NetWare Environments
------------------------------
NACS is compatible with any version of NetWare. However, it must run on a
NetWare 3.11 server. This can be a NetWare 3.11 file server or a RunTime
3.11 server on a LAN with file servers running other versions of NetWare
Runtime v3.11 is a special version of the Netware operating system which
can be used to run NLMs (NetWare Loadable Modules) like NACS 3 but which
can not be used for a file server. NetWare Runtime v3.11 is provided with
the 8 port, 16 port and 32 port versions of NACS.
Even if you have a 3.11 file server, if you anticipate heavy activity on
the file server, you may wish to reduce processing overhead by running NACS
on a Runtime NetWare Server.
NACS and the NetWare Communication Services
--------------------------------------------
NACS is one of Novell's NetWare Communication Services, a family of
products that provide an integrated solution to LAN communication
requirements. To run the NACS, first start the Communication Executive
(the control program for the NetWare Communication Services) and then
launch the NACS software.
NACS Product Versions
---------------------
NACS v3.0 comes in four versions:
2 port
8 port
16 port
32 port
All 4 versions must run on either a NetWare v3.11 file server or a NetWare
Runtime v3.11 server (Runtime supplied with all versions except 2 port).
2 port NACS
-----------
Supports up to two active NASI connections per NACS. You can use standard
serial ports installed in the server and/or you can use ports provided by
various communications adapters*.
8 port NACS
-----------
Allows up to eight active NASI connections per NACS. You can use ports
provided by various communications adapters* and/or up to 5 standard serial
ports installed in the server.
16 port NACS
------------
Allows up to eight active NASI connections per NACS. You can use ports
provided by various communications adapters* and/or up to 5 standard serial
ports installed in the server.
The 32 port NACS
----------------
Allows up to 32 active connections per NACS. You can use ports provided by
various communications adapters* and/or up to 5 standard serial ports
installed in the server.
* We recommend the use of a communications adapter. Tested communications
adapters and adapter drivers certified for NACS are listed later in this
document.
New Features
------------
NACS v3.0 has several new features:
- Dynamic reconfiguration
- Higher data rate support
- Hardware independence
- Local and remote management capabilities
- Security management
- Diagnostic tools
Dynamic Reconfiguration
-----------------------
NACS now runs as a NetWare Loadable Module (NLM), which allows greater
flexibility in running and configuring the NACS. NACS v3.0 includes a
series of asynchronous I/O drivers that also run as NLMs. Because these
modules can be loaded and unloaded without bringing down the NetWare
server, it is easy to reconfigure the NACS when you change the hardware
configuration on the server.
Higher Data Rate Support
------------------------
NACS v3.0 supports higher data rates than previous versions of NACS. NACS
v3.0 can transmit data at up to 115.2 Kbps per port, depending on the
ability of the communications adapter used with the NACS.
Hardware Independence
---------------------
The architecture of the new NACS software allows the use of a variety
of third party communications adapters.
Local and Remote Management Capabilities
----------------------------------------
NACS v3.0 includes a NACS console that lets you configure the NACS and
monitor activity on the NACS as a whole or on individual ports. The NACS
console also lets you view a log file that summarizes activity on the NACS.
You can run the NACS console locally on the NetWare server or remotely
using Novell's RCONSOLE utility on a workstation connected to the LAN.
Security Management
-------------------
NACS v3.0 has improved security management features. Using the NetWare
system configuration utility (SYSCON) you can restrict access to an
individual NACS, to individual ports on a NACS, or to members of authorized
user groups. Access to the NACS console can be restricted to users with a
specified password.
Diagnostic Tools
----------------
NACS v3.0 includes new diagnostic utilities that let you test the operation
of the NACS and the operation of individual ports on the NACS. The NACS
availability test lets you test the availability of a particular NACS. The
NACS performance test lets you test the performance of a specific port on
the NACS. The NACS loopback test lets you test the connection for each
port. NACS also lets you maintain a trace file that shows data written
from and read to specific ports.
Hardware and Software Requirements
----------------------------------
NACS requires the following hardware and software.
NetWare Server Hardware
-----------------------
A NetWare server requires the following hardware to run NACS:
A 386 or 486 PC with appropriate disk and memory requirements as
described in "NetWare Server Memory Requirements" and in "Disk space
Requirements".
An appropriate LAN adapter. All certified NetWare v3.11 LAN adapters are
supported.
At least one standard serial port or one or more of the communications
adapters listed under "Communications Adapters".
Appropriate asynchronous communications hardware, such as modems,
multiplexers, or direct connections to asynchronous hosts.
NetWare Server Memory Requirements
----------------------------------
Use this procedure to determine the total amount of memory required for a
NetWare server running NACS.
If you are using NetWare Runtime v3.11 the minimum recommended system
memory is 6 MB. If you are using NetWare v3.11 in an integrated
configuration, use the following steps to determine the memory
requirements for running NACS.
1. Calculate the memory requirement for each volume.
For each DOS volume:
M = .023 X VOLUME SIZE (in MB) / BLOCK SIZE (default is 4)
For each volume with added Name Space:
M = .032 X VOLUME SIZE (in MB) / BLOCK SIZE (default is 4)
2. Add memory requirements for all volumes:
TOTAL VOLUME MEMORY = Msys: + Mvol1: + Mvol2:
3. Add 2 MB for the operating system and round the value to the next
higher integer. If the total is under 3 MB, use 4 MB for your NetWare
v3.11 memory requirement.
4. Regardless of the number of ports you will run on the NACS, add 2 MB
to the value determined in Step 3 (to run NACS).
5. If you are running both NACS and Netware for SAA, add the amount of
memory required for the number of NetWare for SAA sessions to the value
determined in Step 4.
The following table shows typical memory requirements for the NACS with
various server configurations.
Memory Requirements for NACS
----------------------------
Runtime Server Running NACS* 6MB
Runtime Server Running NACS and NetWare for SAA with 64 Sessions* 8MB
Standard NetWare Server Running NACS* 6MB
Standard NetWare Server with 1 GigaB of Volume Space Running NACS* 8MB
* 2 port, 8 port, 16 port, or 32 port versions
Increasing Memory
-----------------
NACS should run without any problems using the memory calculated using the
procedure outlined above. If you get messages indicating memory problems,
add additional memory to the server in 1MB increments.
Disk Space Requirements
-----------------------
The NACS software requires 3 MB of system volume space in addition to the
space required by NetWare v3.11 or NetWare Runtime v3.11.
Netware Server Software
-----------------------
A NetWare server requires the following software to run NACS:
NetWare v3.11 or NetWare Runtime v3.11
Workstation Hardware
--------------------
A workstation running NASI requires the same hardware as a regular NetWare
workstation.
Workstation Memory Requirements
-------------------------------
A workstation running NASI and a NASI application requires the following
memory.
1. From 34 to 66 KB of memory to run NASI, depending on the number of
sessions a workstation will use. (If enough high memory is available, NASI
can be loaded into "high" memory, the 384KB of address space above the
640KB reserved for DOS, using a DOS extender.
2. An average of 512 KB of memory to run application programs and NetWare
menu utilities. Some NASI applications may require additional memory on
the workstation. Consult the publisher's documentation for additional
information.
Workstation Software
--------------------
A workstation requires the following software to run NASI and NASI
applications. DOS v3.x, 4.x, or 5.x (IBM DOS or MS-DOS) or DR DOS v6.0
NACS Hardware Recommendations
-----------------------------
Server Hardware
---------------
NACS should operate on any NetWare v3.11 server tested and approved by
Novell Labs through Novell's Independent Manufacturer's Support Program
(IMSP). For more information on Pcs that are suitable for use as
NetWare servers, contact your authorized NetWare reseller.
LAN Adapters
------------
NACS is designed to work with any LAN adapter that has been tested and
approved by Novell Labs through Novell's IMSP.
Communications Adapters
-----------------------
Although you can use the COM ports installed in the NACS (up to two
standard serial ports with the 2 port NACS, and up to five standard
serial ports with the 8 port, 16 and 32 port NACS) for asynchronous data
communications, even at 2400bps, data loss can occur (unless a 16550 UART
and AIOCOMX v2 is used). For better performance, we recommend using one
of the following extended serial port adapters that provide flow control
capabilities.
Third party board (driver supplied with NACS)
>> The WNIM+ (Wide Area Network Interface Plus Adapter) available from:
Microdyne Corporation
(800) 255-3967
An ISA (Industry Standard Architecture) bus adapter that provides four
asynchronous ports that can run at up to 38.4 Kbps. An asynchronous I/O
driver for the WNIM+ adapter is provided with the NACS software.
Third party boards and third party drivers for the following have been
certified for NACS:
>> Digiboard 612-943-9020
DigiBoard CX system for AIO (ISA), 16 ports per concentrator (chains up
to 128)
DigiBoard MC/8i for AIO (MCA), 8 port driver
DigiBoard PC/8e for AIO (ISA), 8 port driver
>> Hayes 404-441-1617
Hayes ESP (ISA) 2 port board
The Hayes board MUST have firmware revision 7.0 (upgrade available from
Hayes).
Using DMA Enhanced mode (the preferred setting for the adapters) you can
run both ports on the adapters simultaneously at up to 38.4 Kbps or a
single port at up to 57.6 Kbps.
>> Newport Systems Solutions 714-752-1511
Newport ACI (ISA)
Can run at up to 38.4 Kbps.
>> Star Gate Technologies 800-782-7428
Star Gate One Slot [with AIOCOMX V2 only]
4 serial ports
Modems
------
NACS v3.0 will work with modems that are supported by your NASI compatible
communications applications.
Compatible Communications Programs
----------------------------------
As shown below many communications programs are compatible with NACS for
calling out purposes.
However, only three products are known to be able to call into a NACS and
take over a
workstation on the LAN:
1. PCAnywhere (Including AnywhereIV LAN) from Symantech, is NACS/NASI
compatible for calling BOTH in AND out.
2. CoSession LAN version.
3. Citrix A+ Remote
The following are either known to be or are claimed by their publishers to
be NACS/NASI compatible:
Product Version Telephone #
ASCOM IV Network 1.42 No Longer Sold
BLAST Professional DOS 10.5 800-242-5278
BLAST Professional Server 10.5 " " "
CIM 2.1 Compuserve
Citrix A+ Remote All 305-755-0559
Co/Session LAN II 908-855-9440
Crosstalk Mark 4 1.1 and later 800-348-3221
Crosstalk for Windows (W) 1.2 " " "
Crosstalk 16 Network V3.71 " " "
DynaComm Asynch (W) V3.00.28 713-496-9400
EM220 V4.0 and later 303-447-9251
EM320 All " " "
EM4010 All " " "
EM4105 All " " "
KEAterm (W) **** All 800-663-8702
LEXUS 2000 LAN 2.5 800-227-9597
Minisoft 92 * All 800-682-0200
Minisoft 92 for Windows * All 800-682-0200
Mirror III LAN All "LAN" 800-634-8670
OnLAN 1.2 & 1.3 800-NETWARE
PCanywhere IV LAN 4.5 800-441-7234
PCTerm All 206-487-3656
PolyCom All 314-432-4142
PolyStar/T 2.31 " " "
PolyNet (O) All " " "
Procom+ Network 800-533-4190
Reflection ** All but Mac V 800-872-2829
Relay Gold LAN 3.0 & later 800-822-8224
Smartcom Exe 2.1 404-441-1617
Smartcom III 2.0 " " "
SmartTerm 240 3.0 & later 800-368-5283
SmartTerm 320 All " " "
SmartTerm 340 All " " "
SmartTerm 470 All " " "
Softerm PC 2.0 & later 800-225-8590
Softerm Modular All " " "
VsCom/LAN *** 7.6 312-443-1222
Westlaw/Westmate 2.2 800-937-8529
Zstem 340, LAN, VT 340/320 1.0.3 800-663-8702
Earlier and/or later versions may also be compatible.
(W) Windows application
(O) ODI
* HP2392A Terminal Emulator
** Compatible with NASI2x but problems are known to exist relative to
NASI3x.
*** Does not claim to be compatible with NASI3.
**** VT420 emulation
There are other communications programs that work with NACS and NASI. If
you wish to use a communications program that is not listed above, and
intend to use it with NASI, contact the publisher of the communications
program. Most NASI compatible applications are compatible with both
NACS/NASI v3.x and with v2.x
For information on becoming a NASI developer and a copy of the NASI
Programmers Guide, call 800-REDWORD.
Performance Factors
-------------------
NACS should run satisfactorily on any of the server platforms listed under
"Server Hardware" with sufficient RAM installed in the server. Running in
our test labs, the 32 port version of the NACS product has performed well,
running on the standard Netware platform with file and print services.
If you are running file and print services on the standard NetWare server
and you have, for example, 250 simultaneous users, or you have other CPU
intensive applications installed on the NetWare server, we recommend
running the NACS on a separate RunTime v3.11 server.
Data Transmission Speed
-----------------------
Each NACS port can transmit data at speeds from 50bps to 115.2Kbps.
However, the actual speed available depends on the communications
adapter(s) and driver intstalled in the NACS. When you configure the NACS
ports, the NACS console displays only parameter choices supported by the
driver that controls the port that you are configuring.
- data rates
- parity checking
- stop bits
- data character size
Refer to the communications adapter vendor's documentation for information
on the settings supported by your driver.
Running NACS v3.0 with NACS v2.x
--------------------------------
You can run NACS v3.0 and NACS V2.x on the same LAN.
However, a workstation can run only NASI (v2.xx) or NASI3 (the NACS v3.0
version of NASI). That is, not both at once.
A workstation running NASI v2.x can not access a NACS v3.0 server
A workstation running NASI3 can not access a NACS v2.x server.