28 Years of the Digest ... founded August 21, 1981

Classified Ads
TD Extra News

Add this Digest to your personal   or  


Message Digest 
Volume 29 : Issue 3 : "text" Format

Messages in this Issue:
 Release 4 & Release 5
 Re: Long Distance On Same Physical Switch

====== 28 years of TELECOM Digest -- Founded August 21, 1981 ====== Telecom and VOIP (Voice over Internet Protocol) Digest for the Internet. All contents here are copyrighted by Patrick Townson and the individual writers/correspondents. Articles may be used in other journals or newsgroups, provided the writer's name and the Digest are included in the fair use quote. By using -any name or email address- included herein for -any- reason other than responding to an article herein, you agree to pay a hundred dollars to the recipients of the email. =========================== Addresses herein are not to be added to any mailing list, nor to be sold or given away without explicit written consent. Chain letters, viruses, porn, spam, and miscellaneous junk are definitely unwelcome. We must fight spam for the same reason we fight crime: not because we are naive enough to believe that we will ever stamp it out, but because we do not want the kind of world that results when no one stands against crime. Geoffrey Welsh =========================== See the bottom of this issue for subscription and archive details and the name of our lawyer, and other stuff of interest.
Date: Sun, 3 Jan 2010 10:20:44 -0800 (PST) From: karthikbalaguru <karthikbalaguru79@gmail.com> To: redacted@invalid.telecom.csail.mit.edu Subject: Release 4 & Release 5 Message-ID: <8c4c8f73-4c46-4e14-aed4-526c279d0931@v25g2000yqk.googlegroups.com> Hi, I find that Release 4 and Release 5 of 3GPP support both IPHC and ROHC. But which is popular and in what combination ? In GSM and IS-95,the 0-byte header compression is used to completely eliminate the headers for a majority of the packets during normal operation and the functionalities available in 1-octet header scheme is available from the lower layer functionalities. In CDMA2000, I assume that the 'Header Removal' might be applicable whenever the RTP/UDP/IP information is not required at the UE/MS. However, there are other options that are available in CDMA 2000 - 1. ROHC 2. Link Layer Assisted Robust Header Compression I understand that the limited bandwidth of wireless links makes it impossible to transmit the entire IP/UDP/RTP header with every packet and So,arrived the ROHC mechanism that only transmits the fields that change rather than the entire header, but still maintain context information. To overcome the limitation of sending atleast 1 octet of header information in ROHC,there is a feature that uses the synchronous characteristics of physical channel layer to replace the compressed header information. But, which is widely implemented and used in the following - CDMA2000 1X(IS-2000) / 1xRTT CDMA2000 EV-DO (Rev 0/A/B) Any ideas ? Thx in advans, Karthik Balaguru
Date: Sun, 3 Jan 2010 19:07:14 -0800 (PST) From: hancock4@bbs.cpcn.com To: redacted@invalid.telecom.csail.mit.edu Subject: Re: Long Distance On Same Physical Switch Message-ID: <aaddc086-59c5-4324-bfa2-a578e1c191ae@h9g2000yqa.googlegroups.com> On Jan 1, 10:56 am, Sam Spade <s...@coldmail.com> wrote: > We accountants call it "incremental costs."  The incremental cost of > adding Vonage to my existing broadband connection is zero, in so far > as the cost of the broadband connection is concerned. That "incremental" cost is zero _now_. But the cost of that last mile hasn't gone away and it may go up, especially if today's extensive economies of scale disappear. Also, remember that many new products and services are priced cheap to develop a market. Then, the price goes up. I remember when automatic teller machines were not only free, there were giveaways to promote their use. After they got everybody hooked, they added charges to use them. (Likewise with automatic car toll collection like 'EZPASS'. When it first came out it was free with discounts, now there are service charges and few discounts.) > ***** Moderator's Note ***** > > Doesn't that imply that the cost of disconnecting the broadband > service is zero as well? I'm not joking: it just seems to me that > some of the broadband cost would have to be apportioned to the > "VoIP" use of the broadband connection, since _disconnecting_ the > broadband connection would result in replacement costs. That is correct. There are numerous ways to account for 'costs', the proper method depends on the decision-making to be done with the information. A company considering closing a single store wouldn't consider total company overhead ("fully allocated costs") in that decision; rather, it would consider the costs and revenue of that store (and some other things). But total company overhead still has to be considered for financial reports. [I am trying to sum up a year's worth of cost accounting study into a single paragraph.] As to which to use, what Is changing the issue for many people is that they already have a cellphone and have no intention of giving them up. So with that the costs of a landline look more expensive. HOWEVER, people forget that the equivalent unlimited talk cellphone plans--as compared to their old landline--can get quite expensive. So, killing a landline will probably mean upgrading their cellphone plan to a more costly one.
TELECOM Digest is an electronic journal devoted mostly to telecom- munications topics. It is circulated anywhere there is email, in addition to Usenet, where it appears as the moderated newsgroup 'comp.dcom.telecom'. TELECOM Digest is a not-for-profit, mostly non-commercial educational service offered to the Internet by Bill Horne. All the contents of the Digest are compilation-copyrighted. You may reprint articles in some other media on an occasional basis, but please attribute my work and that of the original author. The Telecom Digest is moderated by Bill Horne. Contact information: Bill Horne Telecom Digest 43 Deerfield Road Sharon MA 02067-2301 781-784-7287 bill at horne dot net Subscribe: telecom-request@telecom-digest.org?body=subscribe telecom Unsubscribe: telecom-request@telecom-digest.org?body=unsubscribe telecom This Digest is the oldest continuing e-journal about telecomm- unications on the Internet, having been founded in August, 1981 and published continuously since then. Our archives are available for your review/research. We believe we are the oldest e-zine/mailing list on the internet in any category! URL information: http://telecom-digest.org Copyright (C) 2009 TELECOM Digest. All rights reserved. Our attorney is Bill Levant, of Blue Bell, PA. --------------------------------------------------------------- Finally, the Digest is funded by gifts from generous readers such as yourself who provide funding in amounts deemed appropriate. Your help is important and appreciated. A suggested donation of fifty dollars per year per reader is considered appropriate. See our address above. Please make at least a single donation to cover the cost of processing your name to the mailing list. All opinions expressed herein are deemed to be those of the author. Any organizations listed are for identification purposes only and messages should not be considered any official expression by the organization.
End of The Telecom digest (2 messages)

Return to Archives ** Older Issues