Wired, outdoor PC cameras?...

[Paul]

On 12/26/2022 5:15 PM, Ken Blake wrote:

On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two =
connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t =
used in some time)
3,6 to 1,2 (Could have blue boot on one end, red =
boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to =
PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

Ohmmeter.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Of the eight wires (four twisted pairs), four of the wires
are \"legacy\" material. 1,2 and 3,6 pairs were used on 10/100BT
for the wiring. The remaining wires would not be doing anything.

On the legacy stuff, a TX pair was wired to an RX pair.
An RX pair was wires to a TX pair. That was the four wires.

Whereas GbE is bidirectional on eight wires total.

https://electronics.stackexchange.com/questions/132486/how-does-bidirectional-transmission-on-gigabit-ethernet-work

And the waveform on GbE is \"beautiful\". It\'s PAM5.
It would look even nicer, if we could see the PAM5
eye diagram on the Tektronix digital scope. Very colorful.

https://www.edn.com/wp-content/uploads/media-1163595-134711-tmw03-04f2fig1.gif

( https://www.edn.com/what-pam5-means-to-you/ )

Paul

 

[Ken Blake]

On Mon, 26 Dec 2022 23:10:11 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

You can (a) look at the wire colors in the cable through the
transparent connector and match them to the chart, or
(b) plug the cable into a cat5 cable tester.

Actually, a few minutes ago, I looked the one cable that I could
easily find. Yes the connector was transparent and yes I could see
that they were the same so it wasn\'t a crossover cable.

But are the connectors always transparent? My memory might be wrong,
but I didn\'t think so.

 

[Ken Blake]

On Mon, 26 Dec 2022 23:10:11 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

You can (a) look at the wire colors in the cable through the
transparent connector and match them to the chart, or
(b) plug the cable into a cat5 cable tester.

Actually, a few minutes ago, I looked the one cable that I could
easily find. Yes the connector was transparent and yes I could see
that they were the same so it wasn\'t a crossover cable.

But are the connectors always transparent? My memory might be wrong,
but I didn\'t think so.

 

[Ken Blake]

On Mon, 26 Dec 2022 23:10:11 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

You can (a) look at the wire colors in the cable through the
transparent connector and match them to the chart, or
(b) plug the cable into a cat5 cable tester.

Actually, a few minutes ago, I looked the one cable that I could
easily find. Yes the connector was transparent and yes I could see
that they were the same so it wasn\'t a crossover cable.

But are the connectors always transparent? My memory might be wrong,
but I didn\'t think so.

 

[Ken Blake]

On Mon, 26 Dec 2022 18:27:33 -0500, Paul <nospam@needed.invalid>
wrote:

On 12/26/2022 5:15 PM, Ken Blake wrote:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two >>>> connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t >>>> used in some time)
3,6 to 1,2 (Could have blue boot on one end, red >>>> boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to >>>> PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.


Ohmmeter.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Thanks, but I don\'t think I need to do that. See the other reply I\'m
about to send.

 

[Ken Blake]

On Mon, 26 Dec 2022 18:27:33 -0500, Paul <nospam@needed.invalid>
wrote:

On 12/26/2022 5:15 PM, Ken Blake wrote:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two >>>> connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t >>>> used in some time)
3,6 to 1,2 (Could have blue boot on one end, red >>>> boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to >>>> PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.


Ohmmeter.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Thanks, but I don\'t think I need to do that. See the other reply I\'m
about to send.

 

[Ken Blake]

On Mon, 26 Dec 2022 18:27:33 -0500, Paul <nospam@needed.invalid>
wrote:

On 12/26/2022 5:15 PM, Ken Blake wrote:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two >>>> connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t >>>> used in some time)
3,6 to 1,2 (Could have blue boot on one end, red >>>> boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to >>>> PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.


Ohmmeter.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Thanks, but I don\'t think I need to do that. See the other reply I\'m
about to send.

 

[Ken Blake]

On Mon, 26 Dec 2022 17:12:15 -0700, Ken Blake <Ken@invalid.news.com>
wrote:

On Mon, 26 Dec 2022 23:10:11 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

You can (a) look at the wire colors in the cable through the
transparent connector and match them to the chart, or
(b) plug the cable into a cat5 cable tester.


Actually, a few minutes ago, I looked the one cable that I could
easily find. Yes the connector was transparent and yes I could see
that they were the same so it wasn\'t a crossover cable.

But are the connectors always transparent? My memory might be wrong,
but I didn\'t think so.

My memory is apparently wrong. It just occurred to me that it would be
very easy to look at the cables coming into my router.

Yes, the ends of all four of those connectors are *all* transparent.
What must have confused me is the part of the connector next to that
end transparent part is opaque, colored the same as the cable itself.

 

[Ken Blake]

On Mon, 26 Dec 2022 17:12:15 -0700, Ken Blake <Ken@invalid.news.com>
wrote:

On Mon, 26 Dec 2022 23:10:11 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

You can (a) look at the wire colors in the cable through the
transparent connector and match them to the chart, or
(b) plug the cable into a cat5 cable tester.


Actually, a few minutes ago, I looked the one cable that I could
easily find. Yes the connector was transparent and yes I could see
that they were the same so it wasn\'t a crossover cable.

But are the connectors always transparent? My memory might be wrong,
but I didn\'t think so.

My memory is apparently wrong. It just occurred to me that it would be
very easy to look at the cables coming into my router.

Yes, the ends of all four of those connectors are *all* transparent.
What must have confused me is the part of the connector next to that
end transparent part is opaque, colored the same as the cable itself.

 

[Ken Blake]

On Mon, 26 Dec 2022 17:12:15 -0700, Ken Blake <Ken@invalid.news.com>
wrote:

On Mon, 26 Dec 2022 23:10:11 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.

You can (a) look at the wire colors in the cable through the
transparent connector and match them to the chart, or
(b) plug the cable into a cat5 cable tester.


Actually, a few minutes ago, I looked the one cable that I could
easily find. Yes the connector was transparent and yes I could see
that they were the same so it wasn\'t a crossover cable.

But are the connectors always transparent? My memory might be wrong,
but I didn\'t think so.

My memory is apparently wrong. It just occurred to me that it would be
very easy to look at the cables coming into my router.

Yes, the ends of all four of those connectors are *all* transparent.
What must have confused me is the part of the connector next to that
end transparent part is opaque, colored the same as the cable itself.

 

[Big Al]

On 12/19/22 12:09, this is what micky wrote:

I wanted to get some waterproof/outdoor cameras that plugged into the
PC, or maybe something that connected straight to the PC.

But all I see for sale are cameras meant to clip to the monitor, not be
screwed to the wall.

Or if they are meant for outside, they are either wifi or they are meant
to go to some sort of separate video recorder.

Do they sell what I want?

I\'m not worried about burglars or porch thieves, I just want to look at
my yard when I\'m inside. There is some wildlife that spend time there,
but I have no window on that side of the room I spend a lot of time in,
and even if there wwere I window, I\'d have to stand up, leave my work at
my desk, stand on the bed and look down at the yard. I want to be able
to watch on the PC monitor instead. --- If I went outside, most of the
animals would run away

I hoped to have 3 cameras**. A real bonus would be if I could do
something like run all 3 into one hub and just run one wire through the
window frame or wall. (Darn, I found what they call a waterproof
enclosure for a 4-port hub, but it\'s showing just a regular $10 hub and
a box without only one usb jack. By Sabrent but Amazon has no ratings
and no Q&A. I\'ll keep looking, or make my own?)

It it possible to cut the the USB connector off of a cord, slide the
wire through a hole, cut the wire to the desired length, and reattach a
USB conector?

**One facing the front, one to the right of that, and one mounted a foot
or two away, around the corner of the house, facing the side yard.

Run the cable through wall, you could cut the usb cable, near the plug, but leave enough to pick the wires to splice.
If you\'re lucky, and the wires are uniquely colored, it would be just time to strip the ends of each wire, slip a small
shrink tube over one of the ends, solder red to red (or whatever), slide the shrink tube over the splice and heat it.
If your not lucky, you screwed the cable.

No idea about the hub.

 

[Big Al]

On 12/19/22 12:09, this is what micky wrote:

I wanted to get some waterproof/outdoor cameras that plugged into the
PC, or maybe something that connected straight to the PC.

But all I see for sale are cameras meant to clip to the monitor, not be
screwed to the wall.

Or if they are meant for outside, they are either wifi or they are meant
to go to some sort of separate video recorder.

Do they sell what I want?

I\'m not worried about burglars or porch thieves, I just want to look at
my yard when I\'m inside. There is some wildlife that spend time there,
but I have no window on that side of the room I spend a lot of time in,
and even if there wwere I window, I\'d have to stand up, leave my work at
my desk, stand on the bed and look down at the yard. I want to be able
to watch on the PC monitor instead. --- If I went outside, most of the
animals would run away

I hoped to have 3 cameras**. A real bonus would be if I could do
something like run all 3 into one hub and just run one wire through the
window frame or wall. (Darn, I found what they call a waterproof
enclosure for a 4-port hub, but it\'s showing just a regular $10 hub and
a box without only one usb jack. By Sabrent but Amazon has no ratings
and no Q&A. I\'ll keep looking, or make my own?)

It it possible to cut the the USB connector off of a cord, slide the
wire through a hole, cut the wire to the desired length, and reattach a
USB conector?

**One facing the front, one to the right of that, and one mounted a foot
or two away, around the corner of the house, facing the side yard.

Run the cable through wall, you could cut the usb cable, near the plug, but leave enough to pick the wires to splice.
If you\'re lucky, and the wires are uniquely colored, it would be just time to strip the ends of each wire, slip a small
shrink tube over one of the ends, solder red to red (or whatever), slide the shrink tube over the splice and heat it.
If your not lucky, you screwed the cable.

No idea about the hub.

 

[Big Al]

On 12/19/22 12:09, this is what micky wrote:

I wanted to get some waterproof/outdoor cameras that plugged into the
PC, or maybe something that connected straight to the PC.

But all I see for sale are cameras meant to clip to the monitor, not be
screwed to the wall.

Or if they are meant for outside, they are either wifi or they are meant
to go to some sort of separate video recorder.

Do they sell what I want?

I\'m not worried about burglars or porch thieves, I just want to look at
my yard when I\'m inside. There is some wildlife that spend time there,
but I have no window on that side of the room I spend a lot of time in,
and even if there wwere I window, I\'d have to stand up, leave my work at
my desk, stand on the bed and look down at the yard. I want to be able
to watch on the PC monitor instead. --- If I went outside, most of the
animals would run away

I hoped to have 3 cameras**. A real bonus would be if I could do
something like run all 3 into one hub and just run one wire through the
window frame or wall. (Darn, I found what they call a waterproof
enclosure for a 4-port hub, but it\'s showing just a regular $10 hub and
a box without only one usb jack. By Sabrent but Amazon has no ratings
and no Q&A. I\'ll keep looking, or make my own?)

It it possible to cut the the USB connector off of a cord, slide the
wire through a hole, cut the wire to the desired length, and reattach a
USB conector?

**One facing the front, one to the right of that, and one mounted a foot
or two away, around the corner of the house, facing the side yard.

Run the cable through wall, you could cut the usb cable, near the plug, but leave enough to pick the wires to splice.
If you\'re lucky, and the wires are uniquely colored, it would be just time to strip the ends of each wire, slip a small
shrink tube over one of the ends, solder red to red (or whatever), slide the shrink tube over the splice and heat it.
If your not lucky, you screwed the cable.

No idea about the hub.

 

[Char Jackson]

On Mon, 26 Dec 2022 18:27:33 -0500, Paul <nospam@needed.invalid> wrote:

On 12/26/2022 5:15 PM, Ken Blake wrote:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two =
connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t =
used in some time)
3,6 to 1,2 (Could have blue boot on one end, red =
boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to =
PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.


Ohmmeter.

Ugh! Just do a visual check. Put the two cable ends side by side. If the
colors match, pin for pin, it\'s straight through. If not, it\'s most
likely a crossover, but could also be miswired (not likely). You can use
the colored pictures found online, as well.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Of the eight wires (four twisted pairs), four of the wires
are \"legacy\" material. 1,2 and 3,6 pairs were used on 10/100BT
for the wiring. The remaining wires would not be doing anything.

On the legacy stuff, a TX pair was wired to an RX pair.
An RX pair was wires to a TX pair. That was the four wires.

Whereas GbE is bidirectional on eight wires total.

https://electronics.stackexchange.com/questions/132486/how-does-bidirectional-transmission-on-gigabit-ethernet-work

And the waveform on GbE is \"beautiful\". It\'s PAM5.
It would look even nicer, if we could see the PAM5
eye diagram on the Tektronix digital scope. Very colorful.

https://www.edn.com/wp-content/uploads/media-1163595-134711-tmw03-04f2fig1.gif

( https://www.edn.com/what-pam5-means-to-you/ )

 

[Char Jackson]

On Mon, 26 Dec 2022 18:27:33 -0500, Paul <nospam@needed.invalid> wrote:

On 12/26/2022 5:15 PM, Ken Blake wrote:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two =
connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t =
used in some time)
3,6 to 1,2 (Could have blue boot on one end, red =
boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to =
PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.


Ohmmeter.

Ugh! Just do a visual check. Put the two cable ends side by side. If the
colors match, pin for pin, it\'s straight through. If not, it\'s most
likely a crossover, but could also be miswired (not likely). You can use
the colored pictures found online, as well.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Of the eight wires (four twisted pairs), four of the wires
are \"legacy\" material. 1,2 and 3,6 pairs were used on 10/100BT
for the wiring. The remaining wires would not be doing anything.

On the legacy stuff, a TX pair was wired to an RX pair.
An RX pair was wires to a TX pair. That was the four wires.

Whereas GbE is bidirectional on eight wires total.

https://electronics.stackexchange.com/questions/132486/how-does-bidirectional-transmission-on-gigabit-ethernet-work

And the waveform on GbE is \"beautiful\". It\'s PAM5.
It would look even nicer, if we could see the PAM5
eye diagram on the Tektronix digital scope. Very colorful.

https://www.edn.com/wp-content/uploads/media-1163595-134711-tmw03-04f2fig1.gif

( https://www.edn.com/what-pam5-means-to-you/ )

 

[Char Jackson]

On Mon, 26 Dec 2022 18:27:33 -0500, Paul <nospam@needed.invalid> wrote:

On 12/26/2022 5:15 PM, Ken Blake wrote:
On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two =
connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t =
used in some time)
3,6 to 1,2 (Could have blue boot on one end, red =
boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to =
PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

Yes, I know. I guess my question wasn\'t clear.


568A/568B are the standards
for which wire goes to which contact in the (usually) female connector.

Yes, I understood that from Char\'s post,

(usually) female connector.

I thought (especially for crossover cable) that it was especially
pertinent to male connectors.


Cables (with male connectors) are typically wired straight through or
crossover (rare now).


Yes, I know. What I didn\'t know was that a crossover cable is one that
is connected 568A at one end and 568B at the other. I was asking
whether (and if so, how) I could tell whether the connections were
568A or 568B. I basically wanted to know that so I could tell whether
an old cable I might have lying around is a crossover cable.


Ohmmeter.

Ugh! Just do a visual check. Put the two cable ends side by side. If the
colors match, pin for pin, it\'s straight through. If not, it\'s most
likely a crossover, but could also be miswired (not likely). You can use
the colored pictures found online, as well.

Check whether 1,2 on one end, goes to 1,2 on the other end.
Or, whether 1,2 on one end, goes to 3,6 on the other end.

The first is straight thru.

The second is crossover.

Of the eight wires (four twisted pairs), four of the wires
are \"legacy\" material. 1,2 and 3,6 pairs were used on 10/100BT
for the wiring. The remaining wires would not be doing anything.

On the legacy stuff, a TX pair was wired to an RX pair.
An RX pair was wires to a TX pair. That was the four wires.

Whereas GbE is bidirectional on eight wires total.

https://electronics.stackexchange.com/questions/132486/how-does-bidirectional-transmission-on-gigabit-ethernet-work

And the waveform on GbE is \"beautiful\". It\'s PAM5.
It would look even nicer, if we could see the PAM5
eye diagram on the Tektronix digital scope. Very colorful.

https://www.edn.com/wp-content/uploads/media-1163595-134711-tmw03-04f2fig1.gif

( https://www.edn.com/what-pam5-means-to-you/ )

 

[Carlos E. R.]

On 19/12/2022 18.09, micky wrote:

It it possible to cut the the USB connector off of a cord, slide the
wire through a hole, cut the wire to the desired length, and reattach a
USB conector?

USB 2, yes. Just 4 wires.


Most mildly remote cameras run on network, either wifi or ethernet.
Possibly powered ethernet variety. A USB cable has to be very short.

--
Cheers,
Carlos E.R.

 

[Carlos E. R.]

On 19/12/2022 18.09, micky wrote:

It it possible to cut the the USB connector off of a cord, slide the
wire through a hole, cut the wire to the desired length, and reattach a
USB conector?

USB 2, yes. Just 4 wires.


Most mildly remote cameras run on network, either wifi or ethernet.
Possibly powered ethernet variety. A USB cable has to be very short.

--
Cheers,
Carlos E.R.

 

[Carlos E. R.]

On 19/12/2022 18.09, micky wrote:

It it possible to cut the the USB connector off of a cord, slide the
wire through a hole, cut the wire to the desired length, and reattach a
USB conector?

USB 2, yes. Just 4 wires.


Most mildly remote cameras run on network, either wifi or ethernet.
Possibly powered ethernet variety. A USB cable has to be very short.

--
Cheers,
Carlos E.R.

 

[Char Jackson]

On Mon, 26 Dec 2022 21:34:34 GMT, scott@slp53.sl.home (Scott Lurndal)
wrote:

Ken Blake <Ken@invalid.news.com> writes:
On Mon, 26 Dec 2022 11:56:48 -0600, Char Jackson <none@none.invalid
wrote:

On Mon, 26 Dec 2022 05:05:36 -0500, Paul <nospam@needed.invalid> wrote:

The T368A and T368B thing is for rolled or straight-thru cabling.

If both ends of a cable are 568A, or if both ends are 568B, it\'s a
straight-through cable. If one end of a cable is 568A and the other end
is 568B, it\'s a crossover cable, what you call rolled, below.

Crossover cables are very rarely needed these days. All of mine are long
gone. What\'s important is to pick a wiring standard and stick with it. I
use 568B, but that\'s just personal preference and momentum.

https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b


I can tell this, by noting the reversal of 1,2 3,6 on the two =
connectors
in the depiction.

1,2 to 1,2 Straight-thru (most all of my cables are like this)
3,6 to 3,6

1,2 to 3,6 Rolled cable (only one spare is like this, haven\'t =
used in some time)
3,6 to 1,2 (Could have blue boot on one end, red =
boot on other end of cable)

Any more info than that, you\'ll have to look up. A rolled cable
might be used between a broadband modem and a router. Straight cables
tend to be used from router to PC or switch to PC. Doing direct PC to =
PC,
uses a rolled cable (only if both ends are limited to 10/100BT NICs).
GbE equipment has MDI/MDIX which can deal with either straight or
rolled cabling.

I had never heard of 568A or 568B before. Short of taking it apart,
is it possible to tell which connector it is?

It\'s the same connector (RJ-45) for both.

AKA 8p8c

568A/568B are the standards
for which wire goes to which contact

Agreed.

>in the (usually) female connector.

Not sure what you\'re saying there. Gender has nothing to do with it. The
two wiring standards (568A & 568B) apply equally to both genders,
although patch panels, which are almost always female, are normally
wired straight. The crossover role, if needed, is normally left for the
patch cable, the link between the patch panel and the piece of
equipment.

>Cables (with male connectors) are typically wired straight through

Right, using either 568A or 568B cable/pin assignment.

>or crossover (rare now).

Agreed.