|
PureBytes Links
Trading Reference Links
|
There are a couple of alternatives to Vince's write up. I live in
the sticks, but did have cable modem when I was in the big city and
have setup several computers in town with ADSL. Now
I have ISDN dual channel and also wireless broadband. ISDN dual
channel is 80 kbps average up or down out here. It is always on and
the most dependable service I have ever seen. If you don't leave it
on all the time it connects faster than any service I have seen. You
set your dial up (not via your modem but the ISDN modem) to not wait
for a dial tone and it connects in about 3 or 4 seconds. One channel
can be used for fax or phone while you are still on the internet.
Wireless broadband is 2.54 Ghtz radio. A good antenna will bring you
3 to 4 mbps to the tower at the ISP but most internet connections past
the ISP are not that fast so it will average about 20 to 25 Meg per
minute upload or download. So far it is plagued by radio
interferrence out here a couple of times a day so it isn't that
dependable yet. That is why I keep the ISDN. You can read a bit
about wireless at http://wnoc.com/index.html
I pay $49 per month for the full wireless connection. ISDN is $55
approx for the phone line then $20 per month to ev1.net for a dual
channel ISDN connection.
Jimmy
Wednesday, December 4, 2002, 11:44:16 PM, you wrote:
Vince> The following is my reply to a private email from a forum member, who
Vince> suggested that I post it for the possible benefit of others.
Vince> - - - -
Vince> I have a satellite feed for my incoming real time data, is Internet
Vince> faster?
Vince> - - - -
Vince> The Internet is not the issue. That is just the set of protocols with which
Vince> your connections and data are sent and received.
Vince> For incoming speed, there is a split second or greater delay on satellite
Vince> data coming to you. That can be 1/2 second to 2 seconds or more. It is
Vince> caused by the distance from earth stations up to the satellite then the
Vince> distance from the satellite to your receiving dish. It is a speed of light
Vince> limitation. Plus the switching delays by the earth stations.
Vince> There are two speeds involved. One is latency, the time from the real event
Vince> until you begin to receive data about the event. The second is the transfer
Vince> rate once each message or piece of data transmission has begun.
Vince> For outgoing speed, all of your outgoing data is sent through the dial up
Vince> connection that you must use with the satellite connection. You can only
Vince> receive data from the satellite, you do not send data back to the satellite,
Vince> at least if you are using a normal office or home satellite connection.
Vince> There are expensive exceptions to this. But even those exceptions have the
Vince> same latency delay problem as for incoming data.
Vince> xDSL (the x means whichever of several DSL standards you can get) can be
Vince> faster or slower for transfer rates, but will always have lower latency for
Vince> the start of any incoming data or message. It will always be considerable
Vince> faster than dial up in transfer speeds for outgoing data.
Vince> There are multiple types and speeds of xDSL to choose from. Choice depends
Vince> upon the luck of how good or bad your local Telco is, and how far away you
Vince> are from a Telco xDSL relay or switch.
Vince> Cable can be the fastest. Depends upon your local choices. Also depends
Vince> upon how many other folks are on the same cable data channel as you are at
Vince> the same time, since everyone shares the available bandwidth within a
Vince> variable area.
Vince> Have found that very few folks in my area use the cable modem during the
Vince> day, so, until AT&T broadband put a governor on the speed, I was measuring
Vince> rates several times faster than a T1 line. Now it is speed limited by AT&T
Vince> to between 200 to 400 mbs on a sustained basis.
Vince> So, which one is faster?
Vince> For real time trading data, both xDSL and cable modems are almost always
Vince> going to be a lot faster than satellite.
Vince> Satellite is impacted by weather, whereas xDSL and cable modems are usually
Vince> not.
Vince> If you have a good local Telco, xDSL may be more reliable and a bit faster
Vince> than cable modem. It depends.
Vince> I use a cable modem because we have fiber optic cable up to our home. xDSL
Vince> is only available over copper wires, so we cannot get xDSL.
Vince> I've found AT&T cable to be fairly unreliable, with one or two failures
Vince> longer than a couple minutes each month, and with several shorter failures
Vince> per month. That will always be a function of the cable modem provider and
Vince> how good the local server farm and physical cables are in your particular
Vince> location.
Vince> It happens that I live in an area with a lot of new road, home and major
Vince> business construction, which seems to affect connection reliability. Have
Vince> considered satellite, which would likely be more reliable, but the satellite
Vince> speed issues always lose out to cable, for me.
Vince> So, suggest that you get the specs for your available choices and simply
Vince> compare those and the costs for each service. Sometimes cable companies
Vince> provide extra discounts for TV cable subscribers, and vice versa, when you
Vince> also get the data service.
Vince> There are some other alternatives.
Vince> One is VPN or Virtual Private Networks. These are usually much more costly.
Vince> Another is a T1 line. Very expensive.
Vince> Vince Heiker
Vince> Flower Mound, Texas
Vince> ---
|