price parity leased vs ADSL

damian24

Senior Member
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Apr 5, 2005
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Location
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<ranting>
To anyone working for Telkom, my apologies (not), I just had to get this off my chest...

I was looking into costing of our leased lines using SAIX vs cost on ADSL (using you know who) and here's the skinny.

Max ADSL speed assumed at (512) translates to about 54kb/s at maximum.
Max Leased speed assumed at (448) which is about 56kb/s on lease lines.

Now cost on a leased is R14918 including the line the ADSL is 585 (477 + 107.54 line rental) ADSL accounts at 54 per GB (let's work on cost price)

Now some calculations :-

24 hour utilisation 31 days a month on both leased to the following)

realistic ADSL speed max (51kb/s) +- 130GB download / month
realistic leased speed (7.8kb/s / 64 kb of 54kb/s) +- 138GB download / month

costs :
ADSL (130GB traffic (54*130) + 585 line cost) = 7605
Lease line = 14918

Now for what you get with the lines :
Leased Lines
guaranteed local access
International is shared 4:1
Access to special services that repairs line in most cases in less than 4 hours
Equal up and download speeds

ADSL
best effort service due to 'nature' of ADSL
pay per GB
shared at leased 20:1
repair times are also best effort
uplink is tied down to 256
512kb/s is actually a 448kb/s line due to ATM overhead
port priorities.

Bearing in mind that 54 bucks/GB is cost the SP's and Telkom will put in a couple of bucks as markup.

huh? what am I missing, by these figures, if ADSL usage were at or near what leased line capacity is then ADSL is likely more profitable than leased line as Telkom must meet contention ratios on leased services thus downloading 130GB on your SAIX line won't be viewed as abuse as you payed for it.

Working on 20:1 ratio ADSL is a reduced service and should then be billed that way thus at most 1/20 of the price of a leased line or 745p/m with no capping and no port priorities. although telkom more likely run 50:1, how do I know this? at 20:1 telkom would need 1.5GB/s international, and they have sub 500Mb/s, so let's work on 50:1 instead.

This is just under 300 bucks, for Telkom to be able to work on the same bandwidth profit line with no capping and no priorities.

S**T we've really been ripped 'cause ADSL seems (technically at lest) more profitable than the dedicated internet bandwidth

Now if someone could fill me in again, how the hell can Telkom not reduce costs?

With the cost of leased lines, it is technically possible to resell ADSL access at a fraction of Telkoms price using Telkoms' infrastructure and still make money! Now if only Telkom would allow access to the ATM backbone and allow virtual circuits to SP's via ADSL.

</ranting>

Me.
 
Your rant, whilst interesting, is a bit incoherent. It's not quite clear what your point is. Perhaps if you rephrased it?
 
I agree...i dont quite understand...
If you're saying that SAIX is making higher margins on ADSL than "real" diginet bandwitdh...I really dont think so...althought the hard cap makes it alot closer.
 
First off... it looks like you are comparing a 512K ADSL to a 512K diginet.

Show me where you get a 512K diginet for R14000 per month (even if that is cost) with internet access and I will buy one.
You are looking more along the R30000 mark.
 
512k local diginet maybe, that would prob include 64k international access..

512k local/512k international would cost you alot more than your example above.
 
Our 512k Internet link (via SAIX) at work, with 128k International is around R17000 pm (This is including leased cisco routers).
If we upgrade to 1Mb, with 256k intl, it will be about R23000 pm.
 
Alright, it was somewhat incoherent hence the <ranting>...

Based on per GB cost of leased vs ADSL the following becomes evident :-

My comparison is based on.
SAIX nat/int gold class 50kb/s downloads at 4:1 contention ratio for international
vs
ADSL 512kb/s assumed 50:1 contention but probably a good deal higher (based on SAIX international bandwidth as published by Telkom InterNet in March (465mbps international) on 60000 ADSL users this is 64:1 contention if we assume all of the SAIX international!

Calculation based of (((60000 * 512) / 1024) / 465))

SAIX Line Cost R30kp/m (Telkom Internet based pricing (current))
assumed maximum download monthly (31 day) 138GB
contended 4:1 cost/GB 30000/138=R217

ADSL
Cost/GB (cost R54, probably marked up to R60 for resale)
Contended 50:1 R54/GB
uncontended 50 * R54 R2700/GB
contended 4:1 2700/4 = R675

Now based on a cost price of R30k a month for a 448kb leased line it costs R217 for a SAIX leased line per GB of data you can download.

using the same calculation on ADSL to obtain a 4:1 contension ratio seems to yield a somewhat higher figure (3 times more). .

The only error I see myself having made here is mistaking the contension ratio but for SAIX to be less than 50:1 they would need at least 1GBPS (very damn unlikely) and not have any leased lines (also very damn unlikely)

I'm sure this a little clearer now.

Me
 
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