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Different speeds with two Comcast Installs in same building

post #1 of 11
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A little background - initially had DSL in the office and the tentant on one side shared the connection - paid half. He then got Comcast and we started sharing his Comcast - paying half. He is moving out soon so we had Comcast come today do our install so we now have phone and HSI via Comcast Business class. HSI is the 12/2 plan which is what the tenant has. I pull 16/5 while he pulls 22/5. Shouldn't the speeds be basically the same since they are in the same location? I am not complaining about the speed but just thought they should be basically be be the same or very close. And I ran these speeds tests pretty much simultaneously.
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post #2 of 11
I think the reason is residential versus business class.
    
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post #3 of 11
Thread Starter 
Nope that's not it as both are Business
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post #4 of 11
And if you run them not simultaneously?
Keep in mind that cable is a shared medium.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by beers View Post

And if you run them not simultaneously?
Keep in mind that cable is a shared medium.

The tenant's connection was still like 21/4.75 and mine was 16/4-5
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post #6 of 11
Maybe he's had his so long they gave him an free upgrade at some point randomly, if not maybe different modems? Otherwise I have no idea. See if you can swap hardware and test it it's the modems or the actual connection.
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post #7 of 11
In ADSL you get a dedicated slot, cable you don't.

EG: If everyone in your street is using cable from a shared demarc you can expect lower than advertised speeds and some people will get different speeds, many factors at play.
    
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post #8 of 11
I've had similar experience (COX here but also with a business HSI account) with both connections run to the same location - both businesses run out of the same office and I'm the admin for both.

In my case, one of the connections is set up with a block of static addresses that are managed and routed internally with the provided modem acting only as a gateway device; and the other modem acting as a router and using NAT translation to a dynamic IP provided by COX. Initially I was seeing higher throughput on the dynamic connection. I thought perhaps it had to do with the routers on my side adding latencies to the static connection - but after further investigation I determined it was a router on the COX side. I don't want to tell you how long I had to fight with their tech support before I escalated the issue to someone in their NOC that actually had the knowledge and authority to adjust the router tables appropriately - but after they did I now see the same bandwidth on both connections.

I'm not saying this will be the case for you necessarily - however, it could be something as simple as them setting the throttling incorrectly for your connection. All cable connections have a throughput limit that's imposed by the hardware (both the physical copper and the modem itself) as well as the limitation of the aggregate - because it's shared bandwidth. However, these limitations are far, far higher than you are ever allowed to use - from a sales standpoint.

I have the exact same connection equipment at my home as I do at my office. However, at home I'm capped at 15Mb/3Mb and at work I have 50Mb/5Mb connections. Since DOCSIS 2.0 the per channel bandwidth is limited physically to 38Mb/27Mb (DL/UL) but with DOCSIS 3.0 this limitation is expanded indefinitely by allowing the local muxing of multiple channels (i.e. it is very possible to have a single point of service with over 100Mb of bandwidth in either direction by bonding 4 channels of 38/27).

All of this is a long way of saying that the software running at the ISP is entirely responsible for almost every aspect of your connections 'limitations' - and it's usually managed by people that are barely able to turn on a PC without assistance (OK that's an exaggeration - but not by that much). So the first thing I would do is call support, and then keep calling until you get someone that can affect a change to your service level. If either of your connections are transmitting at less than your indicated service level - then they BOTH should be transmitting at the same level... because you are both on the same node. Anything else would indicate either a configuration issue or perhaps a premise wiring issue after the distribution point (in which case you would need to fix that).

EDIT - I just re-read your post (carefully this time) rolleyes.gif

On second thought calling your support will only kill your connection rates entirely. You're both getting way more bandwidth than you are paying for!!! In my case I was not getting anywhere close to the listed rates on the one connection (due to a painful amount of packet loss ultimately) so that was a real problem.

If I could even get 1Mb more in either direction on my home connection than I was paying for... I wouldn't care if my neighbor was getting 2Mb extra. Free bandwidth is exactly that! Congratulations! thumb.gif In all likelihood, unless you were using the same machine on both connections - it could be a simple matter of your side's configurations or something like a server or workstation running an unattended update download at the same time.
Edited by DiGiCiDAL - 11/13/12 at 6:37pm
post #9 of 11
It's because Comcast upgraded their packages - http://business.comcast.com/smb/services/internet/plans

I have the same package as you do.
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post #10 of 11
Quote:
Originally Posted by ZFedora View Post

It's because Comcast upgraded their packages - http://business.comcast.com/smb/services/internet/plans
I have the same package as you do.

OMG I hate you guys! tongue.gif

I'm paying almost $500/mo for 50X5 service here - so it costs me $1K/mo for what Comcast charges $369/mo for. eek.gifangrysmiley.gif
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