DP to/from DVI...

[Don Y]

It seems like all DP/DVI cables/adapters are DP *to* DVI.
Esp those with actives inside.

Is it safe to assume that a *cable* with DP & DVI connectors
likewise has that implied signal direction?

(why can\'t they label the connectors IN vs. OUT?)

 

[Lasse Langwadt Christensen]

onsdag den 21. juni 2023 kl. 01.12.31 UTC+2 skrev Don Y:

It seems like all DP/DVI cables/adapters are DP *to* DVI.
Esp those with actives inside.

Is it safe to assume that a *cable* with DP & DVI connectors
likewise has that implied signal direction?

(why can\'t they label the connectors IN vs. OUT?)

I never used an active one but I don\'t remember trying a passive one that didn\'t work in what ever direction I needed it

 

[Don Y]

On 6/20/2023 4:15 PM, Lasse Langwadt Christensen wrote:

onsdag den 21. juni 2023 kl. 01.12.31 UTC+2 skrev Don Y:
It seems like all DP/DVI cables/adapters are DP *to* DVI.
Esp those with actives inside.

Is it safe to assume that a *cable* with DP & DVI connectors
likewise has that implied signal direction?

(why can\'t they label the connectors IN vs. OUT?)

I never used an active one but I don\'t remember trying a passive one that didn\'t work in what ever direction I needed it

So, the connectors just make a PHYSICAL rejiggering of the
signals? E.g., like an RxD/TxD uart on a stereo phone plug?

 

[Don Y]

On 6/20/2023 4:15 PM, Lasse Langwadt Christensen wrote:

onsdag den 21. juni 2023 kl. 01.12.31 UTC+2 skrev Don Y:
It seems like all DP/DVI cables/adapters are DP *to* DVI.
Esp those with actives inside.

Is it safe to assume that a *cable* with DP & DVI connectors
likewise has that implied signal direction?

(why can\'t they label the connectors IN vs. OUT?)

I never used an active one but I don\'t remember trying a passive one that didn\'t work in what ever direction I needed it

I mispoke; the active ones are HDMI.

 

[Martin Rid]

Don Y <blockedofcourse@foo.invalid> Wrote in message:r
> It seems like all DP/DVI cables/adapters are DP *to* DVI.Esp those with actives inside.Is it safe to assume that a *cable* with DP & DVI connectorslikewise has that implied signal direction?(why can\'t they label the connectors IN vs. OUT?)

They can either be active or passive.
Cheers
--


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[Don Y]

On 6/21/2023 7:56 PM, Martin Rid wrote:

Don Y <blockedofcourse@foo.invalid> Wrote in message:r
It seems like all DP/DVI cables/adapters are DP *to* DVI.Esp those with actives inside.Is it safe to assume that a *cable* with DP & DVI connectorslikewise has that implied signal direction?(why can\'t they label the connectors IN vs. OUT?)

They can either be active or passive.

Given /just the item/, how can you EASILY identify whether or not the cable
can be swapped end-for-end?

 

[Chris]

On Thursday, 22 June 2023 at 22:51:03 UTC+10, Don Y wrote:

On 6/21/2023 7:56 PM, Martin Rid wrote:
Don Y <blocked...@foo.invalid> Wrote in message:r
It seems like all DP/DVI cables/adapters are DP *to* DVI.Esp those with actives inside.Is it safe to assume that a *cable* with DP & DVI connectorslikewise has that implied signal direction?(why can\'t they label the connectors IN vs. OUT?)

They can either be active or passive.
Given /just the item/, how can you EASILY identify whether or not the cable
can be swapped end-for-end?

I think it\'s less to do with the cable than with the port/equipment types at each end.

I know from experience that trying to run a HDMI computer output to a DP monitor *does not* work.

Using the same cable, going from a DP computer output to a HDMI monitor input *does* work.

Similarly, I have on my desk at work a USB-C expansion dock that has DP (computer/dock) to DVI (monitor) adaptors that work fine.

ISTM that DP is a superset of HDMI which is a superset of DVI and so on. There used to be DVI to VGA adapters also which would be surprising if they worked in reverse...

--
Cheers,
Chris.

 

[Don Y]

On 6/22/2023 4:35 PM, Chris wrote:

On Thursday, 22 June 2023 at 22:51:03 UTC+10, Don Y wrote:
On 6/21/2023 7:56 PM, Martin Rid wrote:
Don Y <blocked...@foo.invalid> Wrote in message:r
It seems like all DP/DVI cables/adapters are DP *to* DVI.Esp those with actives inside.Is it safe to assume that a *cable* with DP & DVI connectorslikewise has that implied signal direction?(why can\'t they label the connectors IN vs. OUT?)

They can either be active or passive.
Given /just the item/, how can you EASILY identify whether or not the cable
can be swapped end-for-end?

I think it\'s less to do with the cable than with the port/equipment types at each end.

I know from experience that trying to run a HDMI computer output to a DP monitor *does not* work.

I\'ve not (yet) tried that...

> Using the same cable, going from a DP computer output to a HDMI monitor input *does* work.

...but have used an ACTIVE DP to HDMI adapter (into an HDMI cable) to drive
an HDMI input. IIRC, you can buy these adapters with differing levels of
specification support.

Similarly, I have on my desk at work a USB-C expansion dock that has DP (computer/dock) to DVI (monitor) adaptors that work fine.

ISTM that DP is a superset of HDMI which is a superset of DVI and so on. There used to be DVI to VGA adapters also which would be surprising if they worked in reverse...

DVI includes digital AND analog signal connections. As with all of these
other \"standards\", it comes in a boatload of different flavors.

The analog signals surround the \"flat blade\" at the end of the connector.

A DVI-D (digital) cable/connector/connection will omit the 4 pins around
that wide blade. You will discover that trying to plug a DVI-I cable
into a connector that is \"digital only\" (DVI-D) just won\'t fit; the mating
connector won\'t have pins to accept those four signals and, as a result,
the connector won\'t engage.

A DVI-A (analog) cable/etc. will include those four signals plus a
smattering of the remaining signals in the large pin array.

DVI-I includes both.

A \"single link\" digital channel will omit a swath of that \"large pin
array\" in roughly the center of the array. A \"dual link\" channel
will have all of the pins.

Using the presence of pins to determine the type of connector/cable
is foolhardy; you can have a single link DVI-D connection with a
fully populated (all analog AND digital pins) connector. Only
to discover there are no wires attached to the back side of those pins!

:>

I would be happy just to know *if* there are any active components in
the cable/adapter as that would give me a clue as to whether or not
the cable was \"bidirectional\".

The number of different video cable flavors is just staggering
(DVI, VGA, mini versions, HDMI, 13W3, 5BNC, S-video, CGA et al.,
DMS-59, SCART, etc.) I have a (sizeable!) box aptly labeled \"adapters\"
and seem to be perpetually adding items to it! <frown>