Download Speed/telephone wiring

Hope I'm posting to correct forum.........Helping a friend in trying to establish reason for rediuced (loss of) broadband speed

BT main telephone line, entering via garage terminates in the master bedroom (yes that's correct) in NTE5 box. The main phone is plugged in here. Satellite phones are used throughout the house. A secondary box is located downstairs in his office. These were the only sockets provided when the house was buillt and the routing of the cables is unknown but presumed to be within wall cavities and/or under the floor.

Testing this configuration using a BT Home Hub 3 router from his office, indicates he is achieving around 4,5 mbps download

Now, and additional secondary, dual socket, box has been fitted in the garage directly connected to the customer side of the NTE5 box by approx 3 metre cable (bedroom adjoins the attached garage) . Plugged into this box is an external bell. Again with this in circuit a download speed of 4.5Mbps is achieved. Phones and external bell ring.

Now the rub.....An approx 30 metre cable runs from secondary box in the garage, round the house and into the lounge terminating in another secondary, dual socket box. With this in circuit the download speed drops to approx 2.5mbps.

Remove termination in lounge, still 2.5 Mbps.
Remove termination in garage secondary box, speed back to 4.5 Mbps
Reterminate garage end, drops to 2,5 Mbps
Remove termination in garage secondary box, speed back to 4.5 Mbps and so on

So this 30 metre extinsion cable, terminated or unterminated at lounge end when terminated in the garage, drops the speed by 2 Mbps.

The cable has been renewed. Same issue. All sockets connections has been checked for correct pin usage and wire colour code assigment. No issues there.

Appreciate an explanation on the above scenario, possible causes and what to try next.

Is all cable CW1308 compliant? Does this extension run externally and if so, how long has it been out in the fresh air?

Is the master NTE5 fitted with a filtered faceplate? And if so, are all connections taken from the filtered side?

Deadbeat,

Yes, Genuine CW1308 telephone cable staraight off a new reel

The master NTE5 has unfiltered faceplate. All; customer side connections are terminated on this facepakte. Filtering is on BT network side

Forgot to add that cable newly installled so only hours old as external connection. Gives same results as original cablencessth 38.2

The filtering cannot be on the BT network side. The Master is the demarcation point and filtering must be after that.

What filters do you actually have and where are they in the circuit?

There must be confusion in usage of terminology. Perhaps I was being too simplistic in my response.

With regard to the NTE-5 Line box. the removable lower half face plate contains no componets (capacitors or resisters). This face plate is where all customers intermal wiring is taken from. Thus I said the face plate is unfiltered.

The fixed upper half of the NTE-5 line box belongs to the service provider and contains surge protection, ring capacitor and out of service resister. Thus I said filtering was on BT side.

The router, internal phone and external bell are all connected into the customer sockets (master or secondary) via approved filter units

Does the faceplate have 1 socket or 2?

NTE master line box has only one socket.

Secondary in office has one socket

Secondary in garage has two sockets

Secondary in lounge has two sockets

In reply to a post by Anonymous:

NTE master line box has only one socket.

This is where the test socket is that you should take the router stats from, after removing the faceplate you will see the test socket within.

So, it seems as though you do not have any DSL filters in the system.

The router (inc filter) has been plugged directly into the "test" socket i.e the BT netwiork, having removed the NTE-5 face plate. The download speed registers as approx 4.5Mbps the same as with the face plate in situ and router connected to face plate and the same as when plugged into the secondry socket in the office

As mentioned. the router, telephone and bell are connected to the socket outlets via approved filters.

What are the attenuation and noise margin figures and exact sync figures?

Even with twisted pair cable it is feasible to still get noise causing problems, and lots of extensions like you have is not good.

Is all wiring uses the twisted pairs, and NOT split across two pairs? i.e. blue and white, and white and blue are used, rather than a mixture of blue and white and orange and white.

Andrew,

Thanks for reply . As regards the attenuation, noise margin and sync figures I can't tell you. If you let me know how to get I'll try.

Only two secondary boxes are in use. The one in the office for router connection and the one in the garage for the external bell. the one in the lounge is unused but there for possible later move to Sky services.

I hope this answers your query on the cable; Standard internal BT cable is used. Connection are to pins 2 (blue/white), 3 (orange/white) and 5 (white/blue). This configuration is used throughout.

For stats http://kitz.co.uk/adsl/frogstats.php has details for many common ADSL routers.

http://www.thinkbroadband.com/faq/sections/radsl.htm...

The wire on pin 3 is possibly causing an imbalance, and picking up noise particularly on the longer extensions, lift it off of the connector like in the photo above

Andrew,

Thanks for link to obtain stats. I know my friend is off on holiday to Bermuda (lucky fella) very soon for 3 weeks so I'll try and get rhese asap. Would you know what figures would be the norm?

Andrew,

re ring wire. I'd recommended that a i-plate be purchased and connected. This has arrived but not yet installed. I've told my friend that the external bell will no longer work and that he should consider purchasing a electronic telephone ringer which he can plug into any socket. - hopefully it will be load enough to hear outside.

There is no norm I'm afraid. The stats vary depending on the distance from you to the exchange (0 - 63dB), and that mainly determines the sync rate (0-24MBs) and SNR margin (0-15dB).

Friend returned from holiday an I've just been round. We've fitted 3 new single secondary sockets - garage, office and lounge. We've renewed the cable from master socket to garage socket which was also epositiond for easier access. Cabl length appeox 3 metres.

With Office connected (10m estimated cable length) to master, garage connected (3m) to master, external bell plugged into garage secondary, downlooad speed appox 4Mbps. Connect terminated or untermintated lounge cable (30m) to garage secondary the download speeds drops to 2.7 Mbps (!?!). Renove connections from garage secondary, back to 4 Mbps (!?)

Did you connect the ring wires?

An i-plate was purchased and fitted but made no difference. However, since all new sockets etc installed this has not been refitted. I'll get my friend to do that.

Only thing not changed has been the master socket. Wondering whether aging components might have an effect (straw clucthing now). Any views ?