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broadband vs baseband

When I read few articles on the internet regarding Baseband vs Broadband , there are one explanation that make me confused .

Baseband is Digital Transmission , but , Broadband is Analog Transmission .
example : http://www.beechmontcrest.com/broadband_baseband.htm

Is this Broadband referred to Internet Access Broadband ( DSL modem broadband ) ??(Question #1)

I thought DSL Broadband is Digital Transmission which is contrast with Dial up ( Analog ) ?? (Question# 2 ).

The LAN data transmission is only using Baseband , any broadband transmission within LAN ??
(Question #3)

Thx

ukawamail

Baseband Such as LAN
Connect Between 1 Computer to 1 Port

Broadband such as DSL
we can use to Connect Internet
and Phone Call in the same time

kcn

ASKER

My question is why Broadband is "analog" , and not digital , I though broadband such as DSL Internet Connection is Digital ??

ElrondCT

The page you're looking at is using terminology in a different, technical way. "Broadband" in common parlance is a generic term for all "high bandwidth" (or "broad bandwidth", extending the "width" language, which in this context means speed, not physical size) communications, including DSL, cable, high-speed wireless, and the like. You are correct; DSL is a digital communications method ("Digital Subscriber Line"), as is cable Internet.

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aleghart

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aleghart

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kcn

ASKER

ElronCT , so you confirm BROADBAND is Digital Signal . But a lot of of article when come to compare on baseband & broadband , they will mention broadband is analog signal and baseband is digital signal.

These artcles comparison still make me confused , can you help to comment on those article ...

I cannot understand your expolanation on " ....using terminology in a different, technical way... "

Aleghart , Thanks for long explanation but I didn't see you explain whethe Broadband is digital or analog signal ???

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aleghart

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kcn

ASKER

No , I disagree DSL Broadband is analog signal .

DSL Broadband is a Digital Signal which is contrast to Dial Up ( Dial up is using analog signal )

Any further comment from other expert

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ElrondCT

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aleghart

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kcn

ASKER

Hi all ,

this is link that discuss DSL as analog signal . http://www.privateline.com/DSL/DSL.html .

By way is the data transmitted from CO to DSL Modem is DIGITAL Data , or , ANALOG Data ??

Someone help to confirm above question first before I continue ask some question that might clear my mind .

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aleghart

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kcn

ASKER

Hi ,

In fact I am confused on the term "DATA" and "SIGNAL"

If I use OSI Layer to interpret Signal & Data , both of these 2 terms should be identical .

Data at Layer 4 and above ; Signal at Layer 1 ( physical layer in bit ) .

If we say Digital Data but Analog Signal on DSL Modem , then I am confused .

Modem is used to convert Analog to Digital and Digital to Analog .

From Computer to DSL Modem must be Digital Signal ( digital data ) , after passing through DSL Modem , it become Analog Signal ( Analog data or Digital data ??? ) and this Analog Signal will transmit from DSL Modem to CO through 2 wires UTP cable ???

Yes , I am really confused "DATA" and "SIGNAL" , please advise , I thought these 2 are identical in term of networking ???

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aleghart

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kcn

ASKER

Sorry , I cannot understand your explanation .

So, are you telling me both DATA and SIGNAL involved on DSL are ANALOG ??

aleghart

I've never said DSL data is analog. I think we must be speaking a different language.

Maybe an electrical engineer could better explain it. Or someone who has a better grasp of the semantics of the OSI model.

kcn

ASKER

aleghart ,
thanks for your's useful info and alert me the broadband is not digital signal in transmission.

This link will help a lot of people to understand the digital/analog Data vs digital/analog Signal
http://www.cs.purdue.edu/homes/park/cs422-datatrans-2-06s.pdf

The key points from above link as below :-
Four possibilities to consider:
• analog data via analog transmission ! “as is” (e.g., radio)
• analog data via digital transmission ! sampling (e.g., voice, audio, video)
• digital data via analog transmission ! broadband & wireless (“high-speed networks”)
• digital data via digital transmission ! baseband (e.g., Ethernet)

So, from Computer to DSL Modem is : Digital Data via Digital Transmission (Digital signal)
from DSL Modem to ISP is : Digital Data via Analog Transmission ( Analog signal)

If no other expert object , I will assign points to the experts that help me on this question.

Thanks everybody .