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# What are the additional questions I should ask regarding cable internet service?

Posted on 2011-03-22
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Currently, I have an ADSL line that averages about 75 to 80KB/Second download speed.  The service is advertised at up to 3000 kbps incoming and 512 kbps outgoing.

I am considering switching to broadband coaxial cable with my local cable TV company.   For Rd Rnnr service they have:
1.   7 MB "Standard" &
2. 15 MB "Turbo" service.

There is no limit to the amount of bandwidth usage per month.  Their customer service representative says that I can expect at least 100  times more bandwidth at 7MB/Second.  My rough calculation of increased download speed in KB/Second is:
1.   7,000,000/80,000  =  87.5  times faster (close, but not quite 100 times faster).
2. 15,000,000/80,000  = 187.5 times faster.

My house was build in 1996.  I recently had a TIVO installed.  The service man said my coaxial cable is "old".   The incoming cable from outside to the splitter has the following  information printed on the cable: E83032 F660bvv.  Out from the splitter, the information is: E761s1 RG59U.

Questions:
1.  Is my calculation roughly correct ( within +/- 25% correct)?
2.  What are the main Gotcha's regarding coaxial cable internet service?

Thanks!
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Question by:IT79637

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ahdfx earned 2000 total points
ID: 35192917
Do remember when calculating Internet traffic speed verses the data size download speed that one is in bytes and the other in bits.  There are 8 bits to a byte.  the math can get confusing.

1 MB = 1024 KB (MegaByte to KiloByte)
1 mb = 1000 kb (megabit to kilobits)

When the cable service says 7MB, they mean 7Mb or 7 MegaBits per second.
7Mb = 7000000 bits = 875000 Bytes = 854.5 KB
15Mb = 15000000 bits = 1875000 Bytes = 1831 KB

So if your service is getting a true 80KB, and the new service is 854.5KB, then it is just over 10 time faster.  The 15Mb service would be almost 23 times faster.

That being said, your current service is rated at 3000kbps which equals 366 KBps and you are only getting 80KB.  so you ADSL is only working @ 22% efficiency.

ADSL service is pretty spotty unless you are very close to the DSL CO (Central Office)
Coax service will get you faster more reliable service.

About the older Cable..  It is probably RG59.  If all using the Cable for is the internet, then you should be fine.  But if you want to run Internet and HD TV and telephone service...  then you should get the line upgraded to RG6.  RG6 has about double the bandwidth of RG59.  It also depends on the distance of the cable.

http://www.ehow.com/list_7571797_rg6-rg59-specifications.html
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