Improving speed?
Hi AO,
Router now connected through faceplate, I've added an extra filter on the telephone.
Just for interest I quickly connected my DSO on the line "my"side" with no router or telephone connected - 50 Hz @ 2vP-P (image attached)
I can't see the humm originating from my house as the cable exits within 1m of the faceplate and no mains cables near.
So the $1M questions are:-
What might be causing the phone disconnect problem.
What could be the source of the hummmmm.
What can be done about it.
ATB
SN
DSL Connection Details
DSL Line (Wire Pair):
Line 1 (inner pair)
Protocol:
G.DMT Annex A
Downstream Rate:
1792 kbps
Upstream Rate:
448 kbps
Channel:
Interleaved
Current Noise Margin:
6.0 dB (Downstream), 14.0 dB (Upstream)
Current Attenuation:
63.0 dB (Downstream), 31.5 dB (Upstream)
Current Output Power:
17.1 dBm (Downstream), 12.3 dBm (Upstream)
DSLAM Vendor Information:
Country: {0xB5} Vendor: {IFTN} Specific: {0xB182}
PVC Info:
0/38
Router now connected through faceplate, I've added an extra filter on the telephone.
Just for interest I quickly connected my DSO on the line "my"side" with no router or telephone connected - 50 Hz @ 2vP-P (image attached)
I can't see the humm originating from my house as the cable exits within 1m of the faceplate and no mains cables near.
So the $1M questions are:-
What might be causing the phone disconnect problem.
What could be the source of the hummmmm.
What can be done about it.
ATB
SN
DSL Connection Details
DSL Line (Wire Pair):
Line 1 (inner pair)
Protocol:
G.DMT Annex A
Downstream Rate:
1792 kbps
Upstream Rate:
448 kbps
Channel:
Interleaved
Current Noise Margin:
6.0 dB (Downstream), 14.0 dB (Upstream)
Current Attenuation:
63.0 dB (Downstream), 31.5 dB (Upstream)
Current Output Power:
17.1 dBm (Downstream), 12.3 dBm (Upstream)
DSLAM Vendor Information:
Country: {0xB5} Vendor: {IFTN} Specific: {0xB182}
PVC Info:
0/38
Who is your phone provider? Is it also Plusnet?
That's not good. You haven't got a sub-station in your back garden then? Does the phone line go underground or overhead and if the latter, does it share poles with electricity cables? Do any high voltage cables that feed local power supply transformers pass anywhere near the line at all?
The DSO.- Is the the ground side of the signal input isolated from mains earth or connected to it?
Have you got a DVM at all?
This clearly needs looking at more closely.
That's not good. You haven't got a sub-station in your back garden then?
Does the phone line go underground or overhead and if the latter, does it share poles with electricity cables? Do any high voltage cables that feed local power supply transformers pass anywhere near the line at all?The DSO.- Is the the ground side of the signal input isolated from mains earth or connected to it?
Have you got a DVM at all?
This clearly needs looking at more closely.
My provider is Plusnet.
Don't have a substation in the garden, but I do have a Dilithium-Antimatter-Fusion-Reactor in the shed
There are no overhead LV or HV cables within 1/2mile (33kv on poles).
Phone line exits house at low level, up the side of the house to overhead to pole across the street.
I think the DSO ground is isolated from earth, I did test with the i/p reversed, the noise was the same.
I have Fluke DVM.
ATB
SN
Don't have a substation in the garden, but I do have a Dilithium-Antimatter-Fusion-Reactor in the shed
There are no overhead LV or HV cables within 1/2mile (33kv on poles).
Phone line exits house at low level, up the side of the house to overhead to pole across the street.
I think the DSO ground is isolated from earth, I did test with the i/p reversed, the noise was the same.
I have Fluke DVM.
ATB
SN
Check the DSO ground is isolated, because a phone line is balanced (and an earth would clearly upset it ).
Likewise check the DVM and if that's isolated you could see if you get a comparable RMS reading from that in due course.
If you have a spare phone lead, that is one with a BT plug on it, you could plug it into the filter and access the line via the filter, but may be try it daylight hours when the SNRM is above 6/6.5 just in case it causes the sync to drop.
PS. you could use your Dilithium-Antimatter-Fusion-Reactor as a UPS for the modem/router
Likewise check the DVM and if that's isolated you could see if you get a comparable RMS reading from that in due course.
If you have a spare phone lead, that is one with a BT plug on it, you could plug it into the filter and access the line via the filter, but may be try it daylight hours when the SNRM is above 6/6.5 just in case it causes the sync to drop.
PS. you could use your Dilithium-Antimatter-Fusion-Reactor as a UPS for the modem/router
You were right - DSO ground is connected to earth.
DVM = 50mV RMS and measures a frequency of 50Hz
DVM = 50mV RMS and measures a frequency of 50Hz
Bit of an improvement on 2Vpk-pk.
Yup, 50mv still hums though 
I'd still like to fix the phone call disconnect problem though. Anything more I can do this end?
ATB
SN
I'd still like to fix the phone call disconnect problem though. Anything more I can do this end?
ATB
SN
Hi AO.
I have severalDG384 routers but these always connect at a lower sync speed than the 2 wire - this might mask the telephone problem?
I've ordered a Billion 7800N, which should be here today or tomorrow and I'll be able to run some tests over the W/E.
ATB
SN
I have severalDG384 routers but these always connect at a lower sync speed than the 2 wire - this might mask the telephone problem?
I've ordered a Billion 7800N, which should be here today or tomorrow and I'll be able to run some tests over the W/E.
ATB
SN
I expect you meant DG834's How much slower? Is any of them a v4 or a GT? I wouldn't have expected a slower speed to "mask" a drop problem.
How much slower? Is any of them a v4 or a GT? I wouldn't have expected a slower speed to "mask" a drop problem.