Name                                            Last modified      Size  Description
 Parent Directory                                                     -   
 README                                          1992-11-11 01:00  5.4K  
 errata-1.00                                     1992-11-11 01:00  3.0K  
 nclatm-1.01.ps                                  1992-11-11 01:00  559K  
 nclatm-1.01.ps.Z                                1992-11-11 01:00  213K  
 nclatm.ps.Z.old                                 1992-04-02 02:00  213K  
 nclatm.ps.old                                   1992-04-02 02:00  558K  

This directory contains a definition of a public-network compatible customer 
premises network based on Asynchronous Transfer Mode (ATM) in Postcript(TM) form.
The following is extracted from the first chapter to further explain the contents of 
the document.

The original document was issued on April 3rd, 1992 and is stored
under the name nclatm-1.00.ps (and its compressed counterpart,
nclatm-1.00.ps.Z)  After that release, several errors/omissions
were noticed and an errata sheet (errata-1.00) was posted.  A
new version of the document, incorporating these changes is now
also available as nclatm-1.01.ps (and its compressed counterpart
nclatm-1.01.ps.Z)


1. Introduction

This document defines a public-network compatible customer premises network based on 
Asynchronous Transfer Mode (ATM).


1.1  Purpose and Scope

Local Area Networks (LANs) have completed two generations of development. The first 
generation was typified by the CSMA/CD and Token Ring LANs standardized by the 
IEEE 802 committee. Second generation LANs such as FDDI have been standardized, and 
are now beginning deployment. Emerging multimedia applications, however, are pre-
dicted to require aggregate throughputs and real-time transport guarantees that first and 
second generation LANs cannot easily provide. A third generation LAN must accommo-
date the large volumes of traffic generated by multimedia applications.

A third generation LAN should facilitate seamless end-to-end inter-working of public and 
private networks. While first and second generation LAN technologies have enabled the 
deployment of high performance, flexible, data communications services in the local area, 
fundamental technology differences between LANs and the public switched networks 
have slowed the extension of these capabilities into the wide area. Thus, there are three 
primary goals for the third generation LAN: 

-  	provide the real-time transport capabilities necessary for multimedia applications 
incorporating voice and video, 

-  	provide scalable throughput that is capable of growing both per-host bandwidth (to 
enable applications that require large volumes of data in and out of a single host), 
and aggregate bandwidth (to enable installations to grow from a few to several hun-
dred high performance hosts), and 

-  	facilitate the inter-working between LAN and wide area network (WAN) technolo-
gy.

A final explicit goal of a third generation LAN, as set forth in this document, is to take 
maximum advantage of existing international standards wherever possible. Thus, the 
majority of this document uses work done in standards as a base, and merges and adapts 
this work to meet the above requirements.

ATM was selected as the core technology to meet the goals outlined above. It is scalable, 
designed for integration of multimedia applications, and is the basis of the broadband pub-
lic networks being standardized in the International Telegraph and Telephone Consultive 
Committee (CCITT). Below the ATM layer, the physical layer is structured to be extensi-
ble. Two different physical layers are presented in this document, a block-coded layer 
which builds upon technologies developed for the Fibre Channel network [14], and a 
SONET physical layer which is based upon technologies being deployed in the public 
wide area networks. Additional physical layers are anticipated to meet emerging applica-
tion requirements.

Above the ATM layer, a very simple adaptation layer is supported which was designed to 
be efficient and easily integrated into existing higher layer protocols. Since the work on 
signalling in broadband standards bodies is incomplete, a permanent virtual circuit (PVC) 
approach is supported initially. A SNMP-based management information base (MIB) is 
included to allow for the creation and deletion of PVCs. The addition of signalling proto-
cols and additional adaptation layers is expected in future versions of this document. The 
SNMP-based capability will, however, be retained and extended to provide other network 
management capabilities. Finally, the groundwork for the future addition of resource man-
agement capabilities has been laid.



Document Contact Information

For more information regarding this document, please contact:

Ed Geiger
Apple Computer, Inc.
20450 Stevens Creek Blvd.
MS 76-2H
Cupertino, CA 95046
(408) 974-4907 (voice)
(408) 974-0781 (fax)
[email protected]

Glenn Estes
Bellcore
445 South Street
Room MRE 2J-298
Morristown, NJ 07962-1910
(201) 829-4238 (voice)
(201) 829-5976 (fax)
[email protected]

W. David Sincoskie
Bellcore
445 South Street
Room MRE 2Q-286
Morristown, NJ 07962-1910
(201) 829-4426 (voice)
(201) 829-2504 (fax)
[email protected]

Fred Sammartino
Sun Microsystems
2550 Garcia Ave.
MS MTV14-203
Mountain View, CA 94043
(415) 336-2938 (voice)
(415) 336-3156 (fax)
[email protected]

Bryan Lyles
Xerox Palo Alto Research Center
3333 Coyote Hill Rd.
Palo Alto, CA 94304
(415) 812-4466 (voice)
(415) 812-4471 (fax)
[email protected]

This document may be obtained via anonymous FTP from the following locations. The 
Postscript document is named nclatm.ps and is approximately 525 kbytes in length. A 
compressed version of this file, named nclatm.ps.Z is also available and is approximately 
205 kbytes in length.


thumper.bellcore.com:pub/nclatm/nclatm.ps
thumper.bellcore.com:pub/nclatm/nclatm.ps.Z
ftp.apple.com:pub/latm/nclatm.ps
ftp.apple.com:pub/latm/nclatm.ps.Z
parcftp.xerox.com:pub/latm/nclatm.ps
parcftp.xerox.com:pub/latm/nclatm.ps.Z