BHUBER@USC-ECL.ARPA (01/03/86)
I am not sure if this is the correct distribution to be asking the following question, but if this is not the correct list, would someone please advise which is the right one..... Two of us are working on a report about various aspects of data communications and have come up with conflicting information concerning the number of layers in SNA. An IBM report [OSI and SNA: A Perspective, dated April 1981] says that there are seven layers, and a DataPro Report [IBM Systems Network Architecture, dated August 1985] says that there are six layers. Question: (a) "How many layers are officially defined in the IBM SNA?", (b) "Is the 'physical' layer actually an IBM defined layer?", (c) "What is the source of your response to the above?" Mucho thanx in advance for any assistance, Bud
cline@DARTMOUTH.CSNET (Greg Cline) (01/06/86)
Apparently-To: protocols@red.rutgers.edu The official "SNA Concepts and Products" document identifies 6 layers: o NAU Services Manager o FMD Services o Data Flow Control o Transmission Control o Path Control o Data Link Control Greg Cline Dartmouth College, Hanover NH Graduate Computer and Info Science USENET: {decvax|astrovax|cornell|linus}!dartvax!cline ARPA: cline%dartmouth@csnet-relay CSNET: cline@dartmouth