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Standard User MHC
(sensei) Fri 24-Jan-14 01:21:27
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Re: Tandy DSL twisted pair cable.


[re: deleted] [link to this post]
 
In reply to a post by noppix1:
The best RF cable is multi strand. Would you care to share the science.(Other than its hard to crimp).


Are they?

Have a look at the cables feeding cellular base stations, or satcom antennas ... That tends to be Andrews Heliax and that is certainly not multistrand!..


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M H C


taurus excreta cerebrum vincit
Standard User deleted
(deleted) Fri 24-Jan-14 01:30:10
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Re: Tandy DSL twisted pair cable.


[re: MHC] [link to this post]
 
No its not multi strand its twisted feed. But we are now talking about high spec sat up links. nothing to do with consumer kit.
As you all can see from this link.
http://www.thedxshop.com/andrew-heliax/ava6-50-cable...
This stuff is used to kill harmonics within the cable due to the high power being used and will present the host with a clean(cleanest possible) signal.

So from a consumer prospective the multi stand is still the best method.

You also forgot to mention that the power needed to use the Andrews Heliax coax is excessive, heavy on loss and would be useless in low power applications. The cable is also useless in a receive only situation due to the sensitivity loss on the twist.

Even there solid cable applications, although good for high power transmitting applications where reflection is not an issue the design of there intent use is high power transmission only and its still useless as a receiving cable.

I have used this cable in many high power situations.

I fail to see your intent with your statement.

Edited by deleted (Fri 24-Jan-14 02:40:50)

Standard User deleted
(deleted) Fri 24-Jan-14 04:05:17
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Re: Tandy DSL twisted pair cable.


[re: deleted] [link to this post]
 
In reply to a post by noppix1:
The most desired Cat6 cable is multi strand,

Actually, the most desired cable isn't multi-strand. Not exactly...

Here's the science bit... (well, the engineering bit)

Ethernet cable comes in both varieties - multi-strand and single-strand, but always with twisted pairs.

The multi-strand variety is used where flexibility is required - so is invariably seen in patch cables. Consumers usually see this kind of cable because they tend to plug computers into routers directly, using this kind of cable. Consumers don't yet have comms rooms in their houses, with racks of RJ45 ports.

The single-strand, or solid, variety is nowhere near as flexible (as well as being hard to crimp connectors onto), so isn't used for patch cables but is used for in-building cabling within walls, ceilings and floors, with the cables routing back to racks. When you see an ethernet connector in a wall, it will usually be wired at the back with solid cable, which tends to use push-fit auto-strip krone connectors.

Both types should offer the same noise rejection because of the twists. However, multi-strand patch cable loses more signal because it has a higher attenuation.

The difference in capability is seen in the specs for Ethernet itself. Multi-strand patch cable is only recommended for a maximum of 30 metres. Ethernet itself allows for a maximum distance of 100 metres, with 90 metres of solid-core plus 5m of flexible multi-core at either end.

So the most desirable cable for keeping the signal intact is actually the solid core one, because it gives you the least attenuation loss. However, it isn't the most desirable in all circumstances, such as when you want flexibility.

Those arguments are all based on Cat 6 (or cat 5 or 5e) carrying ethernet, but they don't really change when you stick a slightly different connector on and carry DSL signals instead.


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Standard User deleted
(deleted) Fri 24-Jan-14 12:32:25
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Re: Tandy DSL twisted pair cable.


[re: deleted] [link to this post]
 
I was talking about multi strand cable being used in the situation of what would be a short patch lead. I.E a short dsl cable.
I have to agree with most of the points in your post. My main and only disagreement would be the lengths you have quoted as this seem to come down to the quality of the conductor used as shown in the following spec sheet for cat6.
http://docs-europe.electrocomponents.com/webdocs/10c...

As you can see the quote from this manufacturer is 60M and whilst the attenuation is slightly higher the inductance would be much lower but now we are going down another route and totally off topic capacitance/inductance would never be a concern when it comes to household Ethernet or short runs of DSL, Well not for a consumer.
Standard User deleted
(deleted) Sat 25-Jan-14 15:17:27
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Re: Tandy DSL twisted pair cable.


[re: adslmax] [link to this post]
 
I restarted my router (not the modem) yesterday at around 3 pm, due to thinking there was someone on my network. It re sync at 25.25Mbps. I have been monitoring how many errors for the past day and it seems to be a lot. Is this normal or this cable or something not working properly?

Line rate (kbit/s) 26809 2000 0 0
CRC errors 69124 0 0 0
FEC errors 1254 16 0 0
HEC errors 15813 0

And counting, it seems to rack up the errors pretty quick, mainly when I aint doing anything on the net
Standard User deleted
(deleted) Sat 25-Jan-14 21:18:51
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Re: Tandy DSL twisted pair cable.


[re: RobertoS] [link to this post]
 
not at all rubbish when you remove the DSL cable when the FTTC modem is on this will cause a re-sync and the DLM does not like abrupt dissconection on your line which may sync much lower, so when you replace your DSL cable remember to turn of the FTTC modem first and then replace the DSL cable and then turn on the FTTC modem.

Edited by deleted (Sat 25-Jan-14 21:23:37)

Standard User RobertoS
(sensei) Sat 25-Jan-14 22:13:20
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Re: Tandy DSL twisted pair cable.


[re: deleted] [link to this post]
 
YMMV

You are the first person I have seen suggest any such thing on these forums since the day FTTC was introduced. Odd; that.

We all of course know about the inadvisability of doing the same thing a few times in rapid succession. That is a different matter.

(Edit - actually, removing the DSL cable while the VDSL2 is connected does not cause a re-sync. It causes a loss of sync due to a sudden disconnection. Your method does not avoid the sudden disconnection, nor the loss of sync. tongue ).

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 59.4/14.4Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.

Edited by RobertoS (Sat 25-Jan-14 22:17:14)

Standard User deleted
(deleted) Sat 25-Jan-14 22:37:36
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Re: Tandy DSL twisted pair cable.


[re: RobertoS] [link to this post]
 
No worrys it just something you will find out by yourself in due course smile
Standard User RobertoS
(sensei) Sat 25-Jan-14 22:43:42
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Re: Tandy DSL twisted pair cable.


[re: deleted] [link to this post]
 
If it were true, I would have discovered it long ago.

Try again smile.

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 59.4/14.4Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User RobertoS
(sensei) Sat 25-Jan-14 22:45:34
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Re: Tandy DSL twisted pair cable.


[re: deleted] [link to this post]
 
Also, see this post.

My broadband basic info/help site - www.robertos.me.uk | Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 59.4/14.4Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
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