Is it possible to send multiple data bits on a single wire at once?

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Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)?

I know there are methods like PSK or FSK where phase or frequency of carrier is altered to represent different bits or states of signal, but those changes in phase or frequency are transmitted one after another i.e. serially and not at once.

Is there an existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using the shifting done in PSK or FSK?

edited yesterday

asked 2 days ago

CrownedEagle

15615

New contributor

3

Does good old frequency division multiplexing count? Like CATV?
â€“Â filo
2 days ago

1

Not quite similar, but this reminded me of an interesting math question about communication protocols.
â€“Â Wildcard
yesterday

4

You can have 16 voltage levels between -1V and 1V and that is basically 4 bits.
â€“Â PlasmaHH
yesterday

You can do that using any transmission based on symbols (like modem does with bauds)
â€“Â Gianluca Conte
15 hours ago

add a commentÂ |Â

up vote
11
down vote

favorite

Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)?

Is there an existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using the shifting done in PSK or FSK?

edited yesterday

asked 2 days ago

CrownedEagle

15615

New contributor

3

Does good old frequency division multiplexing count? Like CATV?
â€“Â filo
2 days ago

1

Not quite similar, but this reminded me of an interesting math question about communication protocols.
â€“Â Wildcard
yesterday

4

You can have 16 voltage levels between -1V and 1V and that is basically 4 bits.
â€“Â PlasmaHH
yesterday

You can do that using any transmission based on symbols (like modem does with bauds)
â€“Â Gianluca Conte
15 hours ago

add a commentÂ |Â

up vote
11
down vote

favorite

Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)?

Is there an existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using the shifting done in PSK or FSK?

edited yesterday

asked 2 days ago

CrownedEagle

15615

New contributor

Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)?

Is there an existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using the shifting done in PSK or FSK?

analog communication digital-communications

edited yesterday

asked 2 days ago

CrownedEagle

15615

New contributor

edited yesterday

asked 2 days ago

CrownedEagle

15615

New contributor

edited yesterday

asked 2 days ago

CrownedEagle

15615

New contributor

asked 2 days ago

CrownedEagle

15615

asked 2 days ago

CrownedEagle

15615

New contributor

CrownedEagle is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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3

Does good old frequency division multiplexing count? Like CATV?
â€“Â filo
2 days ago

1

Not quite similar, but this reminded me of an interesting math question about communication protocols.
â€“Â Wildcard
yesterday

4

You can have 16 voltage levels between -1V and 1V and that is basically 4 bits.
â€“Â PlasmaHH
yesterday

You can do that using any transmission based on symbols (like modem does with bauds)
â€“Â Gianluca Conte
15 hours ago

add a commentÂ |Â

3

Does good old frequency division multiplexing count? Like CATV?
â€“Â filo
2 days ago

1

Not quite similar, but this reminded me of an interesting math question about communication protocols.
â€“Â Wildcard
yesterday

4

You can have 16 voltage levels between -1V and 1V and that is basically 4 bits.
â€“Â PlasmaHH
yesterday

You can do that using any transmission based on symbols (like modem does with bauds)
â€“Â Gianluca Conte
15 hours ago

Does good old frequency division multiplexing count? Like CATV?
â€“Â filo
2 days ago

Not quite similar, but this reminded me of an interesting math question about communication protocols.
â€“Â Wildcard
yesterday

You can have 16 voltage levels between -1V and 1V and that is basically 4 bits.
â€“Â PlasmaHH
yesterday

You can do that using any transmission based on symbols (like modem does with bauds)
â€“Â Gianluca Conte
15 hours ago

add a commentÂ |Â

7 Answers
7

active

oldest

votes

up vote
28
down vote

16-QAM transmits 4 bits simultaneously by modulating both the phase angle and the carrier amplitude: -

enter image description here

At the receiving end, the noise added during transmission propagation may make the bits look like this: -

enter image description here

But, providing there is still a gap between data received and the halfway point between symbols you can detect it.

So, if you understand the noise in your channel and your channel bandwidth is accommodating, you will be able to send more than one bit simultaneously (as suggested by the Shannon-Hartley theorum): -

enter image description here

edited 16 hours ago

answered 2 days ago

Andy aka

229k9171389

add a commentÂ |Â

up vote
17
down vote

Sure. PSK and FSK (and other modulation methods, for that matter) can have more than two choices for the phase or frequency. If you have four choices, you can send two bits at once.

Advanced telephone modems (before we all switched to broadband) could encode as many as 8 to 10 bits at a time, using 256 to 1024 different signalling states.

QAM-256 diagram (from here)

answered 2 days ago

Dave Tweedâ™¦

108k9129230

10

Oof, looks like you might have a bit of a phase noise problem there.
â€“Â duskwuff
2 days ago

@duskwuff, Yes, that's what the question on DSP.SE is about.
â€“Â Dave Tweedâ™¦
2 days ago

@duskwuff yeah, error-correction gonna be busy:)
â€“Â Martin James
yesterday

add a commentÂ |Â

up vote
8
down vote

I know there are methods like PSK or FSK where phase or frequency of carrier is altered to represent different bits or states of signal, but those changes in Phase or Frequency are transmitted one after another i.e. Serially and not at once.

This is not necessarily true. If your FSK modulation scheme has 4 or 8 or 16 different frequencies that can be transmitted instead of just two, you can transmit 2 or 3 or 4 bits per symbol.

Any modulation scheme that offers more than 2 different symbol choices in each baud interval is transmitting more than 1 bit per symbol.

So I want to know is there any existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using shifting done in PSK or FSK?

For example, pulse-amplitude modulation (PAM, currently a hot topic in fiber optic data communications) and quadrature amplitude modulation (QAM) are typically designed with more than 1 bit per baud.

answered 2 days ago

The Photon

79.5k394187

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up vote
8
down vote

This is just sort of a overarching meta-answer, because I haven't seen the word "symbol" highlighted as much as I'd like. In typical communications systems, you only send one symbol at a time, but you may have more than 1 bit per symbol.

A symbol is a logical concept which is mapped to some physical manifestation. For example, in Dave Chapman's answer there are 4 symbols, mapped to the physical voltage levels of 0V 1.25V 2.5V and 3.75V. In the 16QAM example from Andy aka's answer there's 16 symbols, mapped to a combination of amplitudes and phases.

You can then define your mapping of symbols onto bits. If you have a simple digital lane with 2 symbols: 0V and 5V, you might map those symbols onto the bits 1 and 0. If you have 4 symbols (like Dave's voltage answer), you might map the onto pairs of bits, 00, 01, 10, 11. If you have 16 symbols, like 16QAM does, you might map it to 4 bit groups 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, and 1111.

Thus the more symbols you have, the more bits you can transmit at the same time. Of course, more symbols also means more its harder to distinguish which symbol was transmitted later.

Its also possible to send more than one symbol on a wire, if your physical manifestations of those symbols are easy to separate. For example, cable sends data whose symbols fit into very nice narrow frequency bands (one per channel). The symbols sent on each of these channels can be handled independently.

answered yesterday

Cort Ammon

2,154615

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up vote
6
down vote

After writing this answer, I noticed the question is tagged as "digital electronics": my answer requires analogue components so I don't know if it will be useful. I will leave it regardless in case it is.

As a Control Systems Engineer, I would like to propose a simpler solution.

If you can control either your current or voltage in an analogue fashion with high accuracy, you can pick a high and low reference value, lets say 0-16v for simplicity's sake. From here, if you have a resolution of 1v for your control you can transmit up to 4 bits of information simultaneously by picking the decimal representation of the bit field as your voltage.

For example:

0v => 0000
1v => 0001
7v => 0111
etc.

Then if you set it to a clock, you can understand that this value is updated at x Hz so your programs can respond even if the value hasn't changed.

The only limit to this is the level of precision with which you can control your voltage/current transmission.

There are standardised protocols for this such as PAM16 which is used in ethernet. This picks 16 values between -1v and 1v. Thanks to the comments for this information.

edited yesterday

answered 2 days ago

Persistence

1635

1

So it is essentially just a 4-bit ADC (Analog to Digital converter) with the voltage reference at 16 V + a clock to synchronize the data.
â€“Â Harry Svensson
2 days ago

Aye pretty much, there are other encodings you can use but this was a simple example. Thanks for your edit @HarrySvensson... Night shifts are getting to me
â€“Â Persistence
2 days ago

It can go much further. V.90 and V.92 (aka V.PCM) used up to 128 different levels to encode 7 bits on each sample.
â€“Â jcaron
2 days ago

1

@jcaron theoretically, it can transmit an infinite number of bits if you have infinitely small steps I believe. However, the downside is the number of increments grows exponentially.
â€“Â Persistence
2 days ago

5

Take 16 levels from -1V to 1V and you have PAM16 which is used in 10GBit ethernet
â€“Â PlasmaHH
yesterday

add a commentÂ |Â

up vote
4
down vote

There is a fairly standard method called the "dibit", which sends two bits
in a given time slot. The bits are encoded as an analog voltage, like this:

Voltage Data

0.00 V - 00

1.25 V - 01

2.50 V - 10

3.75 V - 11

This system uses a D/A converter to send, and an A/D converter to receive.
Similar systems exist for "tribits" and quadbits". After that, not so good.
The problem, obviously, is that as you go to smaller and smaller distinctions
between bit patterns, you become more vulnerable to noise.

In fact, this is why digital data transmission was invented in the first place.

Bottom line, you can do this, but there are trade-offs.

answered yesterday

Dave Chapman

411

New contributor

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up vote
0
down vote

A way to transmit several signals over single wire or medium is by using multiplexing, the two major types are FDM (Frequency Division Multiplexing) and TDM (Time Division Multiplexing).

In FDM basically each signal modulates a different carrier, and all the signals are transmitted in the same medium at once, at the reciever side, there's usually some kind of filter which selects the frequency range of interest and demodulates the signal.

In TDM each signal is transmitted in different time slots, imagine a line of 8 signals where every signal has its own turn, during a small time slot signal 1 will be transmitted, then signal 2, then signal 3 and so on, the cycle will repeat and start with signal 1 again.

Also look at CDMA (Code Division Multiple Access), from Wiki:

CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).

A variant of FDM is OFDM (Orthogonal Frequency Division Multiplexing)

edited yesterday

answered yesterday

S.s.

94651429

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7 Answers
7

active

oldest

votes

7 Answers
7

active

oldest

votes

up vote
28
down vote

16-QAM transmits 4 bits simultaneously by modulating both the phase angle and the carrier amplitude: -

enter image description here

At the receiving end, the noise added during transmission propagation may make the bits look like this: -

enter image description here

But, providing there is still a gap between data received and the halfway point between symbols you can detect it.

So, if you understand the noise in your channel and your channel bandwidth is accommodating, you will be able to send more than one bit simultaneously (as suggested by the Shannon-Hartley theorum): -

enter image description here

edited 16 hours ago

answered 2 days ago

Andy aka

229k9171389

add a commentÂ |Â

up vote
28
down vote

16-QAM transmits 4 bits simultaneously by modulating both the phase angle and the carrier amplitude: -

enter image description here

At the receiving end, the noise added during transmission propagation may make the bits look like this: -

enter image description here

But, providing there is still a gap between data received and the halfway point between symbols you can detect it.

So, if you understand the noise in your channel and your channel bandwidth is accommodating, you will be able to send more than one bit simultaneously (as suggested by the Shannon-Hartley theorum): -

enter image description here

edited 16 hours ago

answered 2 days ago

Andy aka

229k9171389

add a commentÂ |Â

up vote
28
down vote

16-QAM transmits 4 bits simultaneously by modulating both the phase angle and the carrier amplitude: -

enter image description here

At the receiving end, the noise added during transmission propagation may make the bits look like this: -

enter image description here

But, providing there is still a gap between data received and the halfway point between symbols you can detect it.

So, if you understand the noise in your channel and your channel bandwidth is accommodating, you will be able to send more than one bit simultaneously (as suggested by the Shannon-Hartley theorum): -

enter image description here

edited 16 hours ago

answered 2 days ago

Andy aka

229k9171389

16-QAM transmits 4 bits simultaneously by modulating both the phase angle and the carrier amplitude: -

enter image description here

At the receiving end, the noise added during transmission propagation may make the bits look like this: -

enter image description here

But, providing there is still a gap between data received and the halfway point between symbols you can detect it.

So, if you understand the noise in your channel and your channel bandwidth is accommodating, you will be able to send more than one bit simultaneously (as suggested by the Shannon-Hartley theorum): -

enter image description here

edited 16 hours ago

answered 2 days ago

Andy aka

229k9171389

edited 16 hours ago

answered 2 days ago

Andy aka

229k9171389

answered 2 days ago

Andy aka

229k9171389

answered 2 days ago

Andy aka

229k9171389

add a commentÂ |Â

up vote
17
down vote

Sure. PSK and FSK (and other modulation methods, for that matter) can have more than two choices for the phase or frequency. If you have four choices, you can send two bits at once.

Advanced telephone modems (before we all switched to broadband) could encode as many as 8 to 10 bits at a time, using 256 to 1024 different signalling states.

QAM-256 diagram (from here)

answered 2 days ago

Dave Tweedâ™¦

108k9129230

10

Oof, looks like you might have a bit of a phase noise problem there.
â€“Â duskwuff
2 days ago

@duskwuff, Yes, that's what the question on DSP.SE is about.
â€“Â Dave Tweedâ™¦
2 days ago

@duskwuff yeah, error-correction gonna be busy:)
â€“Â Martin James
yesterday

add a commentÂ |Â

up vote
17
down vote

Sure. PSK and FSK (and other modulation methods, for that matter) can have more than two choices for the phase or frequency. If you have four choices, you can send two bits at once.

Advanced telephone modems (before we all switched to broadband) could encode as many as 8 to 10 bits at a time, using 256 to 1024 different signalling states.

QAM-256 diagram (from here)

answered 2 days ago

Dave Tweedâ™¦

108k9129230

10

Oof, looks like you might have a bit of a phase noise problem there.
â€“Â duskwuff
2 days ago

@duskwuff, Yes, that's what the question on DSP.SE is about.
â€“Â Dave Tweedâ™¦
2 days ago

@duskwuff yeah, error-correction gonna be busy:)
â€“Â Martin James
yesterday

add a commentÂ |Â

up vote
17
down vote

Sure. PSK and FSK (and other modulation methods, for that matter) can have more than two choices for the phase or frequency. If you have four choices, you can send two bits at once.

Advanced telephone modems (before we all switched to broadband) could encode as many as 8 to 10 bits at a time, using 256 to 1024 different signalling states.

QAM-256 diagram (from here)

answered 2 days ago

Dave Tweedâ™¦

108k9129230

Sure. PSK and FSK (and other modulation methods, for that matter) can have more than two choices for the phase or frequency. If you have four choices, you can send two bits at once.

Advanced telephone modems (before we all switched to broadband) could encode as many as 8 to 10 bits at a time, using 256 to 1024 different signalling states.

QAM-256 diagram (from here)

answered 2 days ago

Dave Tweedâ™¦

108k9129230

answered 2 days ago

Dave Tweedâ™¦

108k9129230

answered 2 days ago

Dave Tweedâ™¦

108k9129230

answered 2 days ago

Dave Tweedâ™¦

108k9129230

10

Oof, looks like you might have a bit of a phase noise problem there.
â€“Â duskwuff
2 days ago

@duskwuff, Yes, that's what the question on DSP.SE is about.
â€“Â Dave Tweedâ™¦
2 days ago

@duskwuff yeah, error-correction gonna be busy:)
â€“Â Martin James
yesterday

add a commentÂ |Â

10

Oof, looks like you might have a bit of a phase noise problem there.
â€“Â duskwuff
2 days ago

@duskwuff, Yes, that's what the question on DSP.SE is about.
â€“Â Dave Tweedâ™¦
2 days ago

@duskwuff yeah, error-correction gonna be busy:)
â€“Â Martin James
yesterday

Oof, looks like you might have a bit of a phase noise problem there.
â€“Â duskwuff
2 days ago

@duskwuff, Yes, that's what the question on DSP.SE is about.
â€“Â Dave Tweedâ™¦
2 days ago

@duskwuff yeah, error-correction gonna be busy:)
â€“Â Martin James
yesterday

add a commentÂ |Â

up vote
8
down vote

I know there are methods like PSK or FSK where phase or frequency of carrier is altered to represent different bits or states of signal, but those changes in Phase or Frequency are transmitted one after another i.e. Serially and not at once.

This is not necessarily true. If your FSK modulation scheme has 4 or 8 or 16 different frequencies that can be transmitted instead of just two, you can transmit 2 or 3 or 4 bits per symbol.

Any modulation scheme that offers more than 2 different symbol choices in each baud interval is transmitting more than 1 bit per symbol.

So I want to know is there any existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using shifting done in PSK or FSK?

For example, pulse-amplitude modulation (PAM, currently a hot topic in fiber optic data communications) and quadrature amplitude modulation (QAM) are typically designed with more than 1 bit per baud.

answered 2 days ago

The Photon

79.5k394187

add a commentÂ |Â

up vote
8
down vote

I know there are methods like PSK or FSK where phase or frequency of carrier is altered to represent different bits or states of signal, but those changes in Phase or Frequency are transmitted one after another i.e. Serially and not at once.

This is not necessarily true. If your FSK modulation scheme has 4 or 8 or 16 different frequencies that can be transmitted instead of just two, you can transmit 2 or 3 or 4 bits per symbol.

Any modulation scheme that offers more than 2 different symbol choices in each baud interval is transmitting more than 1 bit per symbol.

So I want to know is there any existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using shifting done in PSK or FSK?

For example, pulse-amplitude modulation (PAM, currently a hot topic in fiber optic data communications) and quadrature amplitude modulation (QAM) are typically designed with more than 1 bit per baud.

answered 2 days ago

The Photon

79.5k394187

add a commentÂ |Â

up vote
8
down vote

I know there are methods like PSK or FSK where phase or frequency of carrier is altered to represent different bits or states of signal, but those changes in Phase or Frequency are transmitted one after another i.e. Serially and not at once.

This is not necessarily true. If your FSK modulation scheme has 4 or 8 or 16 different frequencies that can be transmitted instead of just two, you can transmit 2 or 3 or 4 bits per symbol.

Any modulation scheme that offers more than 2 different symbol choices in each baud interval is transmitting more than 1 bit per symbol.

So I want to know is there any existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using shifting done in PSK or FSK?

For example, pulse-amplitude modulation (PAM, currently a hot topic in fiber optic data communications) and quadrature amplitude modulation (QAM) are typically designed with more than 1 bit per baud.

answered 2 days ago

The Photon

79.5k394187

I know there are methods like PSK or FSK where phase or frequency of carrier is altered to represent different bits or states of signal, but those changes in Phase or Frequency are transmitted one after another i.e. Serially and not at once.

This is not necessarily true. If your FSK modulation scheme has 4 or 8 or 16 different frequencies that can be transmitted instead of just two, you can transmit 2 or 3 or 4 bits per symbol.

Any modulation scheme that offers more than 2 different symbol choices in each baud interval is transmitting more than 1 bit per symbol.

So I want to know is there any existing communication or modulation method or protocol which can send multiple data bits at once and not one after another using shifting done in PSK or FSK?

For example, pulse-amplitude modulation (PAM, currently a hot topic in fiber optic data communications) and quadrature amplitude modulation (QAM) are typically designed with more than 1 bit per baud.

answered 2 days ago

The Photon

79.5k394187

answered 2 days ago

The Photon

79.5k394187

answered 2 days ago

The Photon

79.5k394187

answered 2 days ago

The Photon

79.5k394187

add a commentÂ |Â

up vote
8
down vote

Thus the more symbols you have, the more bits you can transmit at the same time. Of course, more symbols also means more its harder to distinguish which symbol was transmitted later.

answered yesterday

Cort Ammon

2,154615

add a commentÂ |Â

up vote
8
down vote

Thus the more symbols you have, the more bits you can transmit at the same time. Of course, more symbols also means more its harder to distinguish which symbol was transmitted later.

answered yesterday

Cort Ammon

2,154615

add a commentÂ |Â

up vote
8
down vote

Thus the more symbols you have, the more bits you can transmit at the same time. Of course, more symbols also means more its harder to distinguish which symbol was transmitted later.

answered yesterday

Cort Ammon

2,154615

Thus the more symbols you have, the more bits you can transmit at the same time. Of course, more symbols also means more its harder to distinguish which symbol was transmitted later.

answered yesterday

Cort Ammon

2,154615

answered yesterday

Cort Ammon

2,154615

answered yesterday

Cort Ammon

2,154615

answered yesterday

Cort Ammon

2,154615

add a commentÂ |Â

up vote
6
down vote

As a Control Systems Engineer, I would like to propose a simpler solution.

For example:

0v => 0000
1v => 0001
7v => 0111
etc.

Then if you set it to a clock, you can understand that this value is updated at x Hz so your programs can respond even if the value hasn't changed.

The only limit to this is the level of precision with which you can control your voltage/current transmission.

There are standardised protocols for this such as PAM16 which is used in ethernet. This picks 16 values between -1v and 1v. Thanks to the comments for this information.

edited yesterday

answered 2 days ago

Persistence

1635

1

So it is essentially just a 4-bit ADC (Analog to Digital converter) with the voltage reference at 16 V + a clock to synchronize the data.
â€“Â Harry Svensson
2 days ago

Aye pretty much, there are other encodings you can use but this was a simple example. Thanks for your edit @HarrySvensson... Night shifts are getting to me
â€“Â Persistence
2 days ago

It can go much further. V.90 and V.92 (aka V.PCM) used up to 128 different levels to encode 7 bits on each sample.
â€“Â jcaron
2 days ago

1

@jcaron theoretically, it can transmit an infinite number of bits if you have infinitely small steps I believe. However, the downside is the number of increments grows exponentially.
â€“Â Persistence
2 days ago

5

Take 16 levels from -1V to 1V and you have PAM16 which is used in 10GBit ethernet
â€“Â PlasmaHH
yesterday

add a commentÂ |Â

up vote
6
down vote

As a Control Systems Engineer, I would like to propose a simpler solution.

For example:

0v => 0000
1v => 0001
7v => 0111
etc.

Then if you set it to a clock, you can understand that this value is updated at x Hz so your programs can respond even if the value hasn't changed.

The only limit to this is the level of precision with which you can control your voltage/current transmission.

There are standardised protocols for this such as PAM16 which is used in ethernet. This picks 16 values between -1v and 1v. Thanks to the comments for this information.

edited yesterday

answered 2 days ago

Persistence

1635

1

So it is essentially just a 4-bit ADC (Analog to Digital converter) with the voltage reference at 16 V + a clock to synchronize the data.
â€“Â Harry Svensson
2 days ago

Aye pretty much, there are other encodings you can use but this was a simple example. Thanks for your edit @HarrySvensson... Night shifts are getting to me
â€“Â Persistence
2 days ago

It can go much further. V.90 and V.92 (aka V.PCM) used up to 128 different levels to encode 7 bits on each sample.
â€“Â jcaron
2 days ago

1

@jcaron theoretically, it can transmit an infinite number of bits if you have infinitely small steps I believe. However, the downside is the number of increments grows exponentially.
â€“Â Persistence
2 days ago

5

Take 16 levels from -1V to 1V and you have PAM16 which is used in 10GBit ethernet
â€“Â PlasmaHH
yesterday

add a commentÂ |Â

up vote
6
down vote

As a Control Systems Engineer, I would like to propose a simpler solution.

For example:

0v => 0000
1v => 0001
7v => 0111
etc.

Then if you set it to a clock, you can understand that this value is updated at x Hz so your programs can respond even if the value hasn't changed.

The only limit to this is the level of precision with which you can control your voltage/current transmission.

There are standardised protocols for this such as PAM16 which is used in ethernet. This picks 16 values between -1v and 1v. Thanks to the comments for this information.

edited yesterday

answered 2 days ago

Persistence

1635

As a Control Systems Engineer, I would like to propose a simpler solution.

For example:

0v => 0000
1v => 0001
7v => 0111
etc.

Then if you set it to a clock, you can understand that this value is updated at x Hz so your programs can respond even if the value hasn't changed.

The only limit to this is the level of precision with which you can control your voltage/current transmission.

There are standardised protocols for this such as PAM16 which is used in ethernet. This picks 16 values between -1v and 1v. Thanks to the comments for this information.

edited yesterday

answered 2 days ago

Persistence

1635

edited yesterday

answered 2 days ago

Persistence

1635

answered 2 days ago

Persistence

1635

answered 2 days ago

Persistence

1635

1

So it is essentially just a 4-bit ADC (Analog to Digital converter) with the voltage reference at 16 V + a clock to synchronize the data.
â€“Â Harry Svensson
2 days ago

Aye pretty much, there are other encodings you can use but this was a simple example. Thanks for your edit @HarrySvensson... Night shifts are getting to me
â€“Â Persistence
2 days ago

It can go much further. V.90 and V.92 (aka V.PCM) used up to 128 different levels to encode 7 bits on each sample.
â€“Â jcaron
2 days ago

1

@jcaron theoretically, it can transmit an infinite number of bits if you have infinitely small steps I believe. However, the downside is the number of increments grows exponentially.
â€“Â Persistence
2 days ago

5

Take 16 levels from -1V to 1V and you have PAM16 which is used in 10GBit ethernet
â€“Â PlasmaHH
yesterday

add a commentÂ |Â

1

So it is essentially just a 4-bit ADC (Analog to Digital converter) with the voltage reference at 16 V + a clock to synchronize the data.
â€“Â Harry Svensson
2 days ago

Aye pretty much, there are other encodings you can use but this was a simple example. Thanks for your edit @HarrySvensson... Night shifts are getting to me
â€“Â Persistence
2 days ago

It can go much further. V.90 and V.92 (aka V.PCM) used up to 128 different levels to encode 7 bits on each sample.
â€“Â jcaron
2 days ago

1

@jcaron theoretically, it can transmit an infinite number of bits if you have infinitely small steps I believe. However, the downside is the number of increments grows exponentially.
â€“Â Persistence
2 days ago

5

Take 16 levels from -1V to 1V and you have PAM16 which is used in 10GBit ethernet
â€“Â PlasmaHH
yesterday

So it is essentially just a 4-bit ADC (Analog to Digital converter) with the voltage reference at 16 V + a clock to synchronize the data.
â€“Â Harry Svensson
2 days ago

Aye pretty much, there are other encodings you can use but this was a simple example. Thanks for your edit @HarrySvensson... Night shifts are getting to me
â€“Â Persistence
2 days ago

It can go much further. V.90 and V.92 (aka V.PCM) used up to 128 different levels to encode 7 bits on each sample.
â€“Â jcaron
2 days ago

@jcaron theoretically, it can transmit an infinite number of bits if you have infinitely small steps I believe. However, the downside is the number of increments grows exponentially.
â€“Â Persistence
2 days ago

Take 16 levels from -1V to 1V and you have PAM16 which is used in 10GBit ethernet
â€“Â PlasmaHH
yesterday

add a commentÂ |Â

up vote
4
down vote

There is a fairly standard method called the "dibit", which sends two bits
in a given time slot. The bits are encoded as an analog voltage, like this:

Voltage Data

0.00 V - 00

1.25 V - 01

2.50 V - 10

3.75 V - 11

In fact, this is why digital data transmission was invented in the first place.

Bottom line, you can do this, but there are trade-offs.

answered yesterday

Dave Chapman

411

New contributor

add a commentÂ |Â

up vote
4
down vote

There is a fairly standard method called the "dibit", which sends two bits
in a given time slot. The bits are encoded as an analog voltage, like this:

Voltage Data

0.00 V - 00

1.25 V - 01

2.50 V - 10

3.75 V - 11

In fact, this is why digital data transmission was invented in the first place.

Bottom line, you can do this, but there are trade-offs.

answered yesterday

Dave Chapman

411

New contributor

add a commentÂ |Â

up vote
4
down vote

There is a fairly standard method called the "dibit", which sends two bits
in a given time slot. The bits are encoded as an analog voltage, like this:

Voltage Data

0.00 V - 00

1.25 V - 01

2.50 V - 10

3.75 V - 11

In fact, this is why digital data transmission was invented in the first place.

Bottom line, you can do this, but there are trade-offs.

answered yesterday

Dave Chapman

411

New contributor

There is a fairly standard method called the "dibit", which sends two bits
in a given time slot. The bits are encoded as an analog voltage, like this:

Voltage Data

0.00 V - 00

1.25 V - 01

2.50 V - 10

3.75 V - 11

In fact, this is why digital data transmission was invented in the first place.

Bottom line, you can do this, but there are trade-offs.

answered yesterday

Dave Chapman

411

New contributor

answered yesterday

Dave Chapman

411

New contributor

answered yesterday

Dave Chapman

411

answered yesterday

Dave Chapman

411

New contributor

Dave Chapman is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a commentÂ |Â

up vote
0
down vote

A way to transmit several signals over single wire or medium is by using multiplexing, the two major types are FDM (Frequency Division Multiplexing) and TDM (Time Division Multiplexing).

Also look at CDMA (Code Division Multiple Access), from Wiki:

CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).

A variant of FDM is OFDM (Orthogonal Frequency Division Multiplexing)

edited yesterday

answered yesterday

S.s.

94651429

add a commentÂ |Â

up vote
0
down vote

A way to transmit several signals over single wire or medium is by using multiplexing, the two major types are FDM (Frequency Division Multiplexing) and TDM (Time Division Multiplexing).

Also look at CDMA (Code Division Multiple Access), from Wiki:

CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).

A variant of FDM is OFDM (Orthogonal Frequency Division Multiplexing)

edited yesterday

answered yesterday

S.s.

94651429

add a commentÂ |Â

up vote
0
down vote

A way to transmit several signals over single wire or medium is by using multiplexing, the two major types are FDM (Frequency Division Multiplexing) and TDM (Time Division Multiplexing).

Also look at CDMA (Code Division Multiple Access), from Wiki:

CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).

A variant of FDM is OFDM (Orthogonal Frequency Division Multiplexing)

edited yesterday

answered yesterday

S.s.

94651429

A way to transmit several signals over single wire or medium is by using multiplexing, the two major types are FDM (Frequency Division Multiplexing) and TDM (Time Division Multiplexing).

Also look at CDMA (Code Division Multiple Access), from Wiki:

CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).

A variant of FDM is OFDM (Orthogonal Frequency Division Multiplexing)

edited yesterday

answered yesterday

S.s.

94651429

edited yesterday

answered yesterday

S.s.

94651429

answered yesterday

S.s.

94651429

answered yesterday

S.s.

94651429

add a commentÂ |Â

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