erik@naggum.uu.no (Erik Naggum) (10/15/90)
As several of the knowledgable readers of this list and newsgroup have noticed, the Blue Book X.25 Recommendation is littered with small typos and errors. I received the Errata sheets for X.25(1988), and have typed them in as a public service. Please update your text accordingly. The entries are sorted in increasing page number order, which the original corrigendum was not. Editorial comments and abrigdements of the text in [brackets]. "Corrigendum No. 1" is dated June, 1990, and covers Fascicle VIII.2. The title of section 6.28 in the list of contents, page 158 "TOA/NEI" should be "TOA/NPI" Tables 1/X.25 and 2/X.25, page 162 All hyphens should be suppressed, [so that "8-bits" reads "8 bits", and "16-bits" reads "16 bits"]. [Editorial comment: They left the "Bir order of transmission" typo; should read "bit".] Table 13/X.25, page 196 "TABLEAU" should be "TABLE" section 3, title, page 204 "packet level" should be "packet layer". Table 15/X.25, page 211 "TABLEAU" should be "TABLE" section 4.4.2, third paragraph, last line, page 215 "on a contribution basis" should read "on a contractual basis" section 4.6.3, first line, page 217 "ocndition" should be "condition". section 5.2.1, first paragraph, second line, page 219 "TDA/NZI" should be "TOA/NPI" section 5.2.1, third paragraph (Note), third line, page 219 "TOA/NZI" should be "TOA/NPI" section 5.2.1, fourth paragraph, second line, page 219 "TOA/NZI" should be "TOA/NPI" Figure 5/X.25, page 222, should be replaced by the following one [crude ASCII rendition]: 8 7 6 5 4 3 2 1 --------------------------------------------------------------- | Called DTE address length | |-------------------------------------------------------------| | Calling DTE address length | |-------------------------------------------------------------| : Called DTE address : : (see Note) : : : : +-----------------------------: : | : :-------------------------------+ : : Calling DTE address : : (see Note) : : : : +-----------------------------: : | 0 0 0 0 | --------------------------------------------------------------- Note -- The figure is drawn assuming the number of semi-octets present in the called DTE address field is odd and the number of semi-octets present in the calling DTE address field is even. Figure 16/X.25, title, page 238 "reste" should be "reset". Figure 21/X.25, page 242 This figure should be replaced by the following one (i.e. in the octet of "Registration length", "0" of bit 8 should be removed). : : |-------------------------------------------------------------| | Registration lengthh | |-------------------------------------------------------------| : : Figure 22/X.25, page 243 [Similar error to that in Figure 21/X.25, not reproduced here.] section 6.14.5 in the title, page 252 The word "with" should be deleted. section 6.28, in the title and in the text, page 263 "TOA/NPi" (5 times) should all be "TOA/NPI". sectino 7.2.2.11, title, page 272 "call restriction" should be "call redirection". Figure B-2/X.25, b), page 281 "(see note 6)" should be added after the statement "DTE clear confirmation or clear request". Tableau [sic!] C-2/X.25, page 284 [The "#38" under DISCARD in the second to last row should be moved to the ERROR box.] Table C-3/X.25, the fourth row, page 286 "call request" should be "clear request". Table C-3/X.25, case a), 2nd table, Item 8, page 288 "geater than 109" should be "greater than 109" Annex H, the last line of the table, page 305 The Line "TOA/NPI address subscriptions" should be moved towards the most left [sic] side to align with the line "call redirections and call deflections related facilities." Appendix II, first line, page 307 "link level" should be "data link layer". -------------------------------- That was all. For this time, at least. [Erik Naggum] Naggum Software, Oslo, Norway.
TAMIL@QUCDN.QueensU.CA (03/24/91)
We transfer data among two sites ( Vanquvar B.C and Toronoto,Ont) every day and the data is about 1 - 2 meg a data. Now we use a dial up modem ( USR 14,400 ) but we would like to go into X.25 or other methods to save our lond distance ch arges. Can some one tell me how much X.25 links cost and what persentage lower then the reguler phone long distance. Plus what hard whare and software do we n eed. Thanks in advance. Jay
csg@pyramid.pyramid.com (Carl S. Gutekunst) (03/26/91)
In article <91082.184933TAMIL@QUCDN.QueensU.CA> TAMIL@QUCDN.QueensU.CA writes: >We transfer data among two sites ( Vanquvar B.C and Toronoto,Ont) every day >and the data is about 1 - 2 meg a data. Now we use a dial up modem (USR >14,400) but we would like to go into X.25 or other methods to save our long >distance charges. For bulk data transfers, I'm not aware of anyplace in the world where X.25 public packet services are competitive with high-speed dialup modems over long distance dialup. X.25 is quite expensive for bulk data, since in most countries you more than offset the low connect time charges with high traffic (packet or segment) charges. In Canada, you can call Faspac (416)/232-6781 or Datapac (613) 781-0978 and ask them. I believe SprintNet and Accunet now have operations in Canada as well. I've found Datapac, SprintNet, and Accunet all excruciatingly difficult to work with -- you can never get ahold of the right person (Datapac), or the people don't have a clue as to what they're doing (SprintNet), or they just got re-org'd (again) and haven't figured out who they are working for or what their job is yet (Accunet). I haven't tried talking to Faspac. <csg>
djanes@garfield.cs.mun.ca (David Janes) (03/27/91)
TAMIL@QUCDN.QueensU.CA writes: | We transfer data among two sites ( Vanquvar B.C and Toronoto,Ont) every | day and the data is about 1 - 2 meg a data. Now we use a dial up | modem ( USR 14,400 ) but we would like to go into X.25 or other | methods to save our lond distance charges. Can some one tell me how | much X.25 links cost and what persentage lower then the reguler phone | long distance. Plus what hard whare and software do we need. | | Thanks in advance. | | Jay Here is a rough guideline as to what you would pay: Assuming you are using Datapac 3000 service (Telecom Canada's do-it-yourself PADing service) with a 2400 baud connection you can figure on paying (per Month): Packet Charges: $306.00/mo Basic Access Charge: $440.00/mo (2 nodes @ $220.00 ea) ---------- $746.00/mo In addition, you will have to pay some $500.00 in initial service charges, plus you will have to buy two PADs (several thousand dollars each?) or lease them. If you lease them from the phone company, you are using Datapac 3101 and you can depend on a higher monthly bill (too grumesome for me to figure out exactly). GST, PST and other taxes extra. Also note that if you do not fill your packets (256 bytes each), your packet charges will increase porportionally. Call your local phone company to get the Datapac connect information. COMPUTATION OF RATES (from 'Datapac Rates' #132 07/89): [ 1 Packet = 256 Bytes, 1 Kp = 1000 Packets = 256 000 Bytes ] Rate Between Vancover and Toronto: $1.70/kilopacket Data Transfered: 1 - 2 Mb/day = 1.5 * 30 = 45/Mb month ~= 180 Kp/mo (assuming optimal transmission, no overheads) Packet Costs/Month: 180 Kp * $1.70/Kp = **** $306.00/mo **** Datapac 3000 Service Charges: 2400 bps **** $220.00/mo **** 4800 bps $325.00/mo 9600 bps $465.00/mo dave -- David Janes (dave@garfield.cs.mun.ca)