Re: bandwidth from Telco

On Feb 10, 2012, at 10:46 , Kevin Kargel wrote:


> Full and half duplex have absolutely nothing to do with bandwidth,
> throughput or capacity.

We disagree.  The throughput of a full-dux circuit can be very, very different than a half-dux circuit.

If you are discussing the throughput of a connection to "The Internet" through a provider, then the tail circuit is one of many limitations on that number.  But that was not, I thought, what the OP asked.


> Half duplex simply means that you can only transmit
> data in one direction at a time.  Full duplex means that you can transmit
> data in both directions simultaneously. This is a holdover from the early
> radio and serial and POTS days when the same wire or frequency was used to
> transmit data in either direction so it could not carry multiple data
> streams.

It's not a "hold over".  There are many half-dux circuits in use today.


> The question of (up or down) vs (up+down) vs (up and down) is a contractual
> issue.  Read the service agreement for the answer. 

If the provider is saying they will not provide more than 100 Mbps (in+out), that is different than "the circuit cannot transmit more than 100 Mbps (in+out)".  The OP made it sound like this provider claimed the latter.  If so, the telco is either highly confused, or misspoke when they said the circuit was full-dux.

Perhaps the OP could clarify?

Also, I've never seen a provider sign a contract claiming they would not allow $N Mbps in+out.  They may bill in+out (uncommon, but not unheard of), but why would they not provide as many in-bits as possible no matter out-bits there were unless there was a physical limitation?  Put another way, why would they intentionally limit their revenue?

-- 
TTFN,
patrick


>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]]
>> On Behalf Of Patrick W. Gilmore
>> Sent: Friday, February 10, 2012 1:20 AM
>> To: [email protected]
>> Subject: Re: bandwidth from Telco
>> 
>> On Feb 10, 2012, at 2:00 , Frank Bulk wrote:
>> 
>>> It depends how they sell it -- they might sell it as the total of the
>>> upstream and downstream.  But technically it should be able to do 100 up
>> and
>>> 100 down, so that he can charge you 200. =)
>> 
>> That is only how they bill it.  The definition of full-duplex is that you
>> can send an receive simultaneously.  If they say 100 Mbps means the total
>> of send + receive, that is half-duplex.  Since they are clearly confused,
>> tell them to buy a dictionary (since using BING is clearly beyond them).
>> 
>> It should difficult for anyone to argue "X != X".  That said, if anyone
>> could argue such a thing, it would be a telephone company technician....
>> 
>> --
>> TTFN,
>> patrick
>> 
>> 
>>> -----Original Message-----
>>> From: [email protected] [mailto:[email protected]]
>> On
>>> Behalf Of Jim Pazarena
>>> Sent: Friday, February 10, 2012 12:43 AM
>>> To: [email protected]
>>> Subject: bandwidth from Telco
>>> 
>>> I am confused and possibly being fed a crock by my Telco.
>>> We have a 100Mbps full duplex circuit.
>>> 
>>> However the Telco tells me that the 100Mbps capability is
>>> aggregate total in both directions. In that if our downstream is
>>> sucking 70Mbps, there is only 30Mbps remaining for upstream.
>>> 
>>> Shouldn't I be able to pull and push 100Mbps in each direction
>>> AT THE SAME TIME? Or is this typical of a Telco delivery and
>>> pipe sizing?


-- 
Eat sushi frequently. - Avi
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