Solved: baseband and broadband signalling

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In broadband, total bandwidth is
sliced among different channels.  For example  cable tv, each station
is allocated a slice of total bandwidth.  In cable we see these
channels  are analog.  But do they have to be?   For example in fiber
optic medium., we do the same thing  , transmitting multiple channels(
such as voice,data,video)  at the same time but in digital form.    So
i am observing that broadband medium    can carry multiple analog  as
well as digital signals as is the case with fiber.     The question
remains if i am correct in my observation.
Second
issue  is baseband does not mean point to point  communication.   
Point to point  communication means either we have dedicated link or
virtual link between two nodes.   As we know  ethernet is shared
medium,  for example  10base-T  using hub is good example   where base
signaling is used on a shared medium.
Thanks

Baseband devotes the entire capacity of the medium to one communication channel. Broadband enables two or more communication channels to share the bandwidth of the communications medium. Baseband is the most common mode of operation. Most LANs function in baseband mode, for example. Baseband signaling can be accomplished with both analog and digital signals. Although you might not realize it, you have a great deal of experience with broadband transmissions. Consider, for example, that the TV cable coming into your house from an antenna or a cable provider is a broadband medium. Many television signals can share the bandwidth of the cable because each signal is modulated using a separately assigned frequency. You can use the television tuner to choose the channel you want to watch by selecting its frequency. This technique of dividing bandwidth into frequency bands is called 'Frequency-division Multiplexing' (FDM) and works only with analog signals. Another technique, called 'Time-division Multiplexing' (TDM), supports digital signals.

Yes you are right in broadband  signalling divides the network medium into multiple channels, allowing several signals to traverse the medium at the same time.

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Baseband signaling only sends a single signal over the cable. This type of signaling is typically used in Ethernet networks, with the exception of 10Broad3 standard (rarely used). Baseband uses very simple transceiver devices that send and receive signals on a cable. The simplicity behind baseband signaling is that only three states need to be distinquished: one, zero and idle.

Broadband transceivers are much more complex because they must be able to distinquish those same states, but on multiple channels within the same cable. Because of its simplicity, baseband signaling is used on most Ethernet networks.

Hope to Help !!

Ganesh.H

A baseband unit (BBU) is a device that interprets Baseband frequencies in telecom systems including computer networks, the internet, networks and radio broadcasting systems. A baseband frequency is a transmission at its original frequency, before it has been altered or modulated, and it usually has a frequency range close to zero.

Mechanical engineers and telecom professionals use BBU devices to improve the connection between communication equipment. BBUs are manufactured with a modular design that allows them to perform multiple functions and fit easily into standard physical equipment. When data is passed from various points through a network to its end target, the BBU acts as a switchboard that connects the data to multiple locations (for instance, a Mobile Switching Office). Once a wireless signal is connected, it can be translated into information that is usable by an application or end user.

Typically, a BBU connects to a remote radio unit (RRU) or remote radio head (RRH), both of which are types of transceivers that facilitate wireless or wired connections with a radio station or other endpoint. These are sometimes also referred to as lowpass frequencies.

Characteristics of baseband units

BBU devices are small and easy to incorporate into server rooms, business centers or any central location that allows them to act as a midpoint. Additionally, BBUs have low power consumption and are simple to deploy. This allows them to be easily implemented, replaced or updated within a telecom system.

When placed in an equipment room, BBUs are typically connected to the RRU using optical fiber. It is then responsible for communicating through a physical interface.

Types of baseband units

BBUs can come in a variety of shapes and implementations, including:

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• Individual baseband processing blocks, or objects within receivers that translate data from a wireless signal.
• Ethernet processing cables or internet cables used to decipher information from a wired baseband signal.
• Digital BBUs.
• Rectangular-shaped BBUs, similar to a car radio.
• Flat BBUs, similar to a circuit.
• Cylindrical-shaped BBUs.