jackson@ttidcb.UUCP (Dick Jackson) (11/14/85)
Fellow D-commers, I humbly request your assistance. I would really appreciate info on the following subjects: 1. Contact at IEEE for asking questions about, and ordering, standards documents (802 committee stuff). 2. Source for ordering standards document on Group 3 facsimile (who the devil adminsters this one?) 3. Any modem vendors besides IBM who make modems which report diagnostic information through the RS-232 interface? I.e. so you can write network control software in your host. Many thanks in advance, Dick Jackson
dennis@rlgvax.UUCP (Dennis Bednar) (11/15/85)
> > > > Fellow D-commers, I humbly request your assistance. I would really appreciate > info on the following subjects: > > 1. Contact at IEEE for asking questions about, and ordering, standards > documents (802 committee stuff). > I don't have the name of IEEE contact, but I have some related news which fellow dcom'ers might find interesting. IEEE has published the IEEE 802.x (where x = 1 to 5, I think) standards in a series of books, available from IEEE. Personally, the one book which I want to read most, is the Token Bus spec, because of the fact that a distributed algorithm is needed to pass the token. I would like to learn more about the startup algorithm which is responsible for deciding which node on the LAN gets to hold the token first. Also, I remember about 2 years ago reading some articles that debated which was better: CSMA/CD or token-bus? The battle was between non-deterministic (csma/cd) and deterministic (token-bus). The claim was that token-bus is superior to csma/cd when there is a lot of traffic on your LAN, because the law of probabilities may be against your LAN-node being able to send your packet out over the LAN to another LAN-node. I personally wonder how well token-bus would work in real life, if there was a heavy load on the LAN, when a new LAN-node suddenly was turned on, and wanted to have itself admitted to the "logical ring". This next idea may not be well-formulated, but is is possible that the powered on LAN-nodes admission to the "logical ring" will be non-deterministic? That is, is there a drawback that you cannot predict how long it will take in the worst case, for the new LAN-node to get the token in the first place???? I cannot answer this question, because it depends on how the startup initialization is done in the first place. -- Dennis Bednar Computer Consoles Inc. Reston VA 703-648-3300 {decvax,ihnp4,harpo,allegra}!seismo!rlgvax!dennis
stanwyck@druxu.UUCP (StanwyckDA) (11/15/85)
> 2. Source for ordering standards document on Group 3 facsimile (who the > devil adminsters this one?) > > Dick Jackson Group 3 Fax is standardized by CCITT in Recommendation T.4. Recommendation of the CCITT can be ordered directly from the International Telecommunications Union (Geneva, Switzerland) if you have a Swiss Franc currency device, or much more easily (for US locations) from the U.S. licensee - Omnicom, Inc. Omnicom's address, etc: (source for all the 1984 CCITT Red Books) (per ad in Oct. 85 Data Communications Magazine) Omnicom, Inc. 501 Church St. N.E. Suite 206 Vienna, VA 22180 (703) 281-1135 Red Books are available in English, French, or Spanish. -- ________ ( ) Don Stanwyck @( o o )@ 303-538-5004 ( || ) Cornet-374-5004 ( \__/ ) [druxu|drutx]!stanwyck (______) AT&T-IS @ Denver, CO