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-   -   60M : Acceptable T3/T4 amounts (https://www.cableforum.uk/board/showthread.php?t=33694842)

Sephiroth 26-08-2013 10:15

Re: Acceptable T3/T4 amounts
 
Quote:

Originally Posted by kangocartman (Post 35614891)
@ pip I thought you would be able to see them just fine as I could, I have always done it that way sorry if it's not clear.
@ Seph my service comes on it's own feed no splitters or attenuators to the house. I wanted to have it on my drive as my current neighbours are moving soon.
How would I get the info you need ?
Thanks again

You'd look in your neighbour's garden where the VM cable comes in to an external wall box.

If it tees off to him and tees off to you, then you're sharing a cable from the cabinet and that would be bad news. Let us know and we can advise further.

kangocartman 26-08-2013 13:56

Re: Acceptable T3/T4 amounts
 
Sorry i was referring to pip thinking i had not made my upload clearer.
My feed is not shared in any way.

pip08456 26-08-2013 19:41

Re: Acceptable T3/T4 amounts
 
Quote:

Originally Posted by kangocartman (Post 35614936)
Sorry i was referring to pip thinking i had not made my upload clearer.
My feed is not shared in any way.

Re my post.

My bad.

I was right clicking and selecting view image which showed a thumbnail.

Left clicking on it makes it viewable.

kangocartman 27-08-2013 00:11

Re: Acceptable T3/T4 amounts
 
Quote:

Originally Posted by pip08456 (Post 35615030)
Re my post.

My bad.

I was right clicking and selecting view image which showed a thumbnail.

Left clicking on it makes it viewable.

Thanks for that
The reason for this thread was to see what is an acceptable amount of errors per day to then push VM to finish what they started.
Going to call them tomorrow hopefully get the UK staff during day and see.
Thanks again for your input.
Kc

horseman 27-08-2013 08:08

Re: Acceptable T3/T4 amounts
 
Quote:

Originally Posted by kangocartman (Post 35614936)
….
My feed is not shared in any way.

Of course your feed is shared ultimately via a tap at the street cab or in some cases via a pit in the street!

However that's just semantics but your description of how the specific "feed" to your external ominibox is what needs clarifying back ultimately to the street drop and the cab/pit itself.

Originally you appear to state that "repull" crew are attempting to lay RG11 on your drive? Subsequent post(s) appears to state your neighbour arranged for your service to be supplied via his "drive"?
You even later specify that because he's moving you want your service provided via your drive?

Since "WE" don't know the relative placements of your respective houses(property boundaries nor drives or whether they're shared in part) with respect to main street ducting then you'll need to both clarify and check for visible cable drops from the street run on the boundaries of both properties to establish whether the "feed" is shared at that point.

In a "conventional" street (for want of a better word) each property is adjacent to each other along the length of the street. However it happens that in some cases one (or even several) property may lie behind each other and have shared access to the public highway?

Either way you should start at the street looking for CATV pits on pavement and/or smaller round/square access points at boundary of nearest (or each property) nearest to the street. You may see visible small portion of ducting from an adacent cable T inspection cover penetrating a boundary fence/wall if you have one. If both properties have a frontage to the public highway in an adjacent "side by side - conventional" layout then you would expect an individual feed for each property. If their is only one then you may well have one "shared feed"?

In that latter scenario your own or your neighbours feed will typically be split from either of your individual external omnibox's mounted on the walls of your houses? Allowing for individual feeds to other rooms for seperate BB or TV STB's in additional rooms that may be laid horizontally or vertically then you should be able to establish this by the number of visible cables on each omnibox?(remember that a thinner telephone cable may exit the box which should be ignored in this context or may be part of a siamese type cable which also has the larger coax).

Whether you require RG11 (which has less distance loss and better propogation characteristics) rather than RG6 will then depend on relative distances from the Street Cab and whether a single street drop does in this case feed both properties?

Because VM's network inherited different original cable franchises that deployed slightly different CATV/RFI topologies originally then you can't apply a single rule to cover all the UK.
For example if I walk down my street in Hove then a street cab is located every 250-300m approx covering 48 domiciles split between both sides of the road.
Each frontage is approx 15m including the intervening shared drive between semi detached houses. Each property appears to be connected by RG6 and thus the worst case user to Street Cab length should be less than 150m worst case.
In another area/street with a terraced scenario then each frontage could even only be 5m and thus a 96tap street cab could be used instead of the 48tap cab in my scenario in order to reduce the number of street cabs(and thus potentially the number of amplifiers in the cascade chain back to O/E Fibre Node)?.

Good practise suggests you don't cascade (unpowered) splitters which is what Seph is trying to establish. So in an ideal scenario you will have say an individual feed from an individual tap in a streetbox and the only split will be either in your omnibox and/or after your internal wallbox. (viz 2 or less).
If say your street run/dop is more than say 150m then depending on the signal integrity(and any amp alignment) at your street cab then RG11 may be required instead of lower cost RG6?

One of the many reasons you can end up in this scenario is that from initial flood CATV cabling back to around mid 90's (and in some areas far earlier) then the HPPN (Homes Passed Per Node) calculation may have changed with new developments(larger property/site replaced with one or more dwellings) or (in case of some areas of Brighton & Hove, and Bath/Bristol etc) 3 story town houses converted to flats. Thus in 20years numerous public utility maintenance/upgrade work could potentially damage existing CATV ducts and reduce their cabling capacity, and street cabs become congested with multiple splitters off limited original tap board capacity and so on.

VM is slowly addressing this Cab congestion as well as re-segmenting in some cases to blow fibre deeper into the network closer to the user to reduce the HPPN and amp cascade numbers closer to N+1 (and eventually at some far far future date actually potentially facilitate even FTTH/P).

Of course unless you're a sad individual like Seph or myself all this is hidden from a laymans perspective unless you are specifically looking for the clues? ;)

kangocartman 27-08-2013 16:56

Re: Acceptable T3/T4 amounts
 
Sorry for the delay replying horseman took me a while to digest your post. :D
Barring the semantics, and to clarify my feed is a single RG6 from the cab to my home up to the grey box which would normally split between the digibox and the SH2 but as I don't have the tv connected it goes straight to my SH.
Regarding the neighbours, my original feed was laid over 10 years ago when my then neighbour allowed VM to sink it in his garden, he has since died so my current neighbours who are due to move soon are not as keen and neither am I, so I've asked for it to be laid under my drive.
To repeat the original reason for my thread was to see if there was an acceptable amount of errors in a "normal" service.
Kc

Update:

VM have booked another re-pull of RG11 for the 13-09-13 so hopefully all will be sorted.
Thanks to all who've advised on this it is appreciated.
Kc

Kushan 27-08-2013 17:15

Re: Acceptable T3/T4 amounts
 
Good luck! Hopefully the repull will go well.

Jonnymeg 27-08-2013 20:15

Re: Acceptable T3/T4 amounts
 
Quote:

Originally Posted by kangocartman (Post 35615258)
To repeat the original reason for my thread was to see if there was an acceptable amount of errors in a "normal" service.

In short:

The odd T3 is not a major concern.

The pre errors you have are huge and should set alarm bells ringing. Your modem seems to be coping with them quite well but something is seriously wrong somewhere.

If a repull for RG11 can be done then do it but there are many things that can cause such errors such as faulty joints, connectors, modems, isolators and tap ports in cabs.
You need to get a tech that will spend time replacing everything that can be replaced and even test for these errors directly off the cab as it could be causing issues for your whole street.

kangocartman 27-08-2013 21:13

Re: Acceptable T3/T4 amounts
 
Quote:

Originally Posted by Jonnymeg (Post 35615388)
In short:

The odd T3 is not a major concern.

The pre errors you have are huge and should set alarm bells ringing. Your modem seems to be coping with them quite well but something is seriously wrong somewhere.

If a repull for RG11 can be done then do it but there are many things that can cause such errors such as faulty joints, connectors, modems, isolators and tap ports in cabs.
You need to get a tech that will spend time replacing everything that can be replaced and even test for these errors directly off the cab as it could be causing issues for your whole street.

Jonnymeg
Thank you for your input, although I have learned a great deal from this forum which has enabled me to deal more effectively with VM I am not able to read the logs and up/down stream info like the experts on here can.
I knew something was wrong but didn't know what to look for and only posted after VM said my stats were fine.
I should have posted my stats in my first post so apologies for that.
Hopefully after the repull things will improve.
Thanks again
Kc


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