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Message Digest
Volume 29 : Issue 3 : "text" Format
Messages in this Issue:
Release 4 & Release 5
Re: Long Distance On Same Physical Switch
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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.
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End of The Telecom digest (2 messages)
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