TalkTalk Fibre installed, 2mbps speed

Just helping out a friend get TalkTalk fibre installed today and the router is only syncing at 2.1mbps

the DSL checker estimated that it would be in the following ranges:

Clean: 13.1 - 19.2 mbps
Impacted: 5.8 - 16.5 mbps

Now I know that things can improve during the initial DLM, but the max attainable reported by the router being as low as 2500 is worrying me

Line stats are as follows:
DSL synchronization status: Up
Connection status: Showtime
Upstream line rate (kbit/s): 1009
Downstream line rate (kbit/s): 2107
Maximum upstream rate (kbit/s): 1009
Maximum downstream rate (kbit/s): 2564
Upstream noise safety coefficient (dB): 6
Downstream noise safety coefficient (dB): 6.1
Upstream interleave depth: 1
Downstream interleave depth: 1
Line standard: VDSL2
Upstream line attenuation (dB): 11.5
Downstream line attenuation (dB): 29.3
Upstream output power (dBm): 0.4
Downstream output power (dBm): 1.7
Channel type: Fast

Connected to the test socket?

In reply to a post by lee111s:

Connected to the test socket?

Doesn't have one

Cable comes in to an old BT Junction box which is split to 3 sockets throughout the house

My advice = leave well alone, wait the 10 days (although it makes no odds but they wont help till you do) see how it is and hopefully it wont improve and you'll get an engineer out.

The more you mess with it the worse it could get.

What did TalkTalk say you would get?

That needs reporting to TalkTalk to get the wiring fixed, for free if they play fair. In the days of engineer installs it would have been done automatically.

Things do not improve on the initial DLM.

2.2.1 Dynamic Line Management
Dynamic Line Management (DLM) is employed in GEA-FTTC. DLM constantly manages lines to maintain a target link quality (speed and stability). It does this for as long as the product exists.
At provision, the line is put on �wide open� VDSL2 line profiles allowing the upstream and downstream line speeds to run at the upper limit of the product option selected.

BT SIN 498.

In reply to a post by solchain:

My advice = leave well alone, wait the 10 days (although it makes no odds but they wont help till you do) see how it is and hopefully it wont improve and you'll get an engineer out.

The more you mess with it the worse it could get.

What did TalkTalk say you would get?

I can't remember what was quoted when he signed up but the talktalk.co.uk site shows minimum guaranteed as 3, estimated as between 5-16

If things don't improve then i would like to get new VDSL NTE5 installed where the line enters and I'll run a cat5 from the VDSL port to the TalkTalk router

I'd be [censored] off if 2.5mb is all it gets, I was never expecting loads as its a long way from the cab but 2.5 is less than his old DSL

It does happen where ADSL outperforms at longer distances.

With a range of 5-16 hopefully there's something an Openreach engineer can do.

There's something wrong with those power figures. Either they are very low or the router is misreporting them.

Mine are typical values:-
SNR (dB): 5.9 6.0
Attn(dB): 19.9 0.0
Pwr(dBm): 13.5 7.4

Ignore the 10 days. That is a BT Wholesale thing, quite apart from being untrue. Get onto TalkTalk, because if you have three extensions running off a junction box before the master (one of them will be an old style master) you have bridge taps, which are bad news on ADSLx and frequently disaster on FTTC.

Make sure you tell them about the wiring. Not just the poor speed. Also query the power figures perhaps, in case the router is faulty.

Couldn't the OP ask for a boost engineer to be sent out?
They will check everything and will try their best to get the most out of the line.

I had one for my ADSL2+ connection a month or two ago, it didn't improve anything for us here, but he replaced all boxes (BT80, NTE5A + all faceplates) etc.

Worth a try.

Paul

I have a feeling TalkTalk have some sort of arrangement with Openreach whereby they can send "their own" engineers to many problem reports, similar to Openreach themselves using Kelly's and Quinn's for FTTC domestic installation in the recent past.

Only if the TT engineer finds there is a genuine line problem do they call Openreach.

( I could be entirely wrong about this, but there have definitely been reports on here that look as if that has happened).

Assuming I'm right then the first thing a TT person will do is regularise that wiring. Free.
_{Edit: typo.}

Edited by RobertoS (Tue 16-Aug-16 08:48:35)

In reply to a post by RobertoS:

I have a feeling TalkTalk have some sort of arrangement with Openreach whereby they can send "their own" engineers to many problem reports, similar to Openreach themselves using Kelly's and Quinn's for FTTC domestic installation in the recent past.

Only if the TT engineer finds there is a genuine line problem do they call Openreach.

( I could be entirely wrong about this, but there have definitely been reports on here that look as if that gas happened).

Assuming I'm right then the first thing a TT person will do is regularise that wiring. Free.

It possible and makes sense to me.

Paul

In reply to a post by RobertoS:

There's something wrong with those power figures. Either they are very low or the router is misreporting them.

Mine are typical values:-
SNR (dB): 5.9 6.0
Attn(dB): 19.9 0.0
Pwr(dBm): 13.5 7.4

Ignore the 10 days. That is a BT Wholesale thing, quite apart from being untrue. Get onto TalkTalk, because if you have three extensions running off a junction box before the master (one of them will be an old style master) you have bridge taps, which are bad news on ADSLx and frequently disaster on FTTC.

Make sure you tell them about the wiring. Not just the poor speed. Also query the power figures perhaps, in case the router is faulty.

I did think the power figures were low.

I ran the attenuation through a speed calculator at: http://www.speedguide.net/dsl_speed_calc.php

29DB attenuation claims to give 16301kbps on VDSL2, which is the upper end of what the dsl checker predicted the speed should be

In reply to a post by connormill:

I ran the attenuation through a speed calculator at: http://www.speedguide.net/dsl_speed_calc.php

When I put my attenuation figure in there I get well under half of the speed I actually get (<30 vs 64.5), so I'm not sure how reliable that is.

In reply to a post by kasg:

In reply to a post by connormill:

I ran the attenuation through a speed calculator at: http://www.speedguide.net/dsl_speed_calc.php

When I put my attenuation figure in there I get well under half of the speed I actually get (<30 vs 64.5), so I'm not sure how reliable that is.

Wrong for me too.

That page requires you to know the attenuation measured at 300kHz, as it varies when measured at other frequencies. I'm not sure our modems report attenuation measured that way

It also needs adjusting for 0.5mm copper - the loss rate used as a default is appropriate for AWG26 (equivalent to 0.4mm copper) ... but still converts my "8.7dB" into a length of over 600m. With actual speeds of 80/20, and attainable of over 100/30, I'm pretty confident my line isn't 600m.

As mentioned TT will want to send their own "Bright Sparks" engineer. This is usually something TT try to make the user pay £50 for. This engineer arrives and all he does is basically checks a filter is being used on everything and often changes the router to see if it makes any difference.

If he diagnoses nothing obviously wrong with equipment then he gets TT to issue a BT engineer.

This is done because customers were complaining to TT about £100+ bills as the faults were often due to the home owner having a terrible setup at home e.g. not using filters etc. By charging £50 upfront, the customer expects the charge, it is cheaper than BT charge to do the same job and there is no disagreement. Of course, it stinks that often customers pay £50 for nothing, and then get an engineer.

So they wouldn't be authorised to put in an NTE5 and sort the wiring from it?

In reply to a post by RobertoS:

So they wouldn't be authorised to put in an NTE5 and sort the wiring from it?

No way, they are not BT engineers, they work for TalkTalk and have very little knowledge.

Their job is to look at the basics, is the router connected with a filter? Is a sky box unfiltered? Does connecting a new router fix the issue? Are there any obvious glaring issues which BT would notice and charge £100+?

Would connecting a homeplug fix the issue of "I have no internet" when the wireless is not reaching the desktop in reality?

Edited by ukhardy07 (Tue 16-Aug-16 14:13:45)

Another issue with the Bright Sparks engineers. They are looking for blatant faults to pass onto BT, such as no connection, or connection dropping when the customer picks up the landline.

Things such as slow speeds, if the connection works, can be a challenge to get a Bright Sparks engineer to forward onto BT.

The Bright Sparks engineer may very well visit the consumer premises, deem the connection is online with an uptime of 3 days (for example), at a speed of 2Mbps. A router change is likely to be attempted. TT receive back that the connection works fine, with a decent uptime, no need to send an engineer. The speed in itself may not be enough to warrant a BT engineer, especially if that speed falls in the estimates provided at sign up.

In the OPs case, I think TT may send out a BT engineer immediately, as the fault is clearly with BT cabling and the speeds fall outside of the acceptable estimates. If you persuade CS there is a definite issue with BTs wiring, they skip out the Bright Sparks engineer. E.G if you ring and say "I cut through BTs cable outside." In that instance you only see openreach.

In reply to a post by WWWombat:

In reply to a post by kasg:

In reply to a post by connormill:

I ran the attenuation through a speed calculator at: http://www.speedguide.net/dsl_speed_calc.php

When I put my attenuation figure in there I get well under half of the speed I actually get (<30 vs 64.5), so I'm not sure how reliable that is.

Wrong for me too.

That site said my ADSL2+ speed should be 6.8Mbps and their actual speed test gave me a download speed of 8Mbps, which isn't possible due to I am only syncing up as 6Mbps (i.e. ~5.2Mbps download speed) as shown here: TBB Speedtest

According to my FRITZ!Box the last time I tried it back in January this year and it said the following:

Attainable throughput: 6.240 Mbps (receive), 1.085 Mbps (send)
   Current throughput: 6.154 Mbps (receive), 1.085 Mbps (send)
...
Signal-to-noise ratio: 5dB (receive), 26dB (send)
     Line attenuation: 41dB (receive), 20dB (send)
      Power reduction: 0dB (receive), 0dB (send)

Now the HH4 right now says the following very limited stats:

DSL noise margin: 5.90 dB upstream, 6.00 dB downstream
DSL line rate: 1083 Kbps upstream, 6156 Kbps downstream

And both of these stats haven't changed much since January, mind you I wouldn't mine the 8Mbps which I wait for the 26th to arrive

The new broadband connection that pulls extra speeds that you though was impossible out the void

Paul

While the OP's friend still has three phone connections out of a junction box. Independent of how many have anything connected, there are bridge taps and that needs sorting out. No question about it.

In reply to a post by RobertoS:

While the OP's friend still has three phone connections out of a junction box. Independent of how many have anything connected, there are bridge taps and that needs sorting out. No question about it.

Agreed.

Paul

Couldn't the OP ask for a boost engineer to be sent out?
They will check everything and will try their best to get the most out of the line.

"Boost" jobs are a product offered by Openreach.

AFAIK Only BT Retail and BT Business broadband have ever bought and used this product. Why, lord only knows.

That needs reporting to TalkTalk

Agreed. It is doubtless the cause of the low sync.

What the OP needs is to persuade TT to raise a 'super fast visit assured' task.

'Someone" has to pay to sort out this wiring issue ..... it won't be Openreach, as you rightly said, it would have been done for the price of an engineer install.....

It's all a game these days.

In reply to a post by Zarjaz:

Couldn't the OP ask for a boost engineer to be sent out?
They will check everything and will try their best to get the most out of the line.

"Boost" jobs are a product offered by Openreach.

AFAIK Only BT Retail and BT Business broadband have ever bought and used this product. Why, lord only knows.

I didn't know that
I know I was sent one a little while back, didn't improve anything, but it did rule out our internal wiring being the issue, which was a relief

Paul

What TT charge for is pretty awful:

http://help2.talktalk.co.uk/engineer-charges

It appears if openreach equipment is at fault on the users property, e.g. a faulty jelly crimp outside in a BT66 box, the end user would be charged, even though it is pre-NTE. It says they charge "Repairing damaged lead in wiring (from terminating point of drop wire/underground feed to NTE)."

Is that not against standard openreach guidelines, where upto the NTE5 is not the consumers liability?

Edited by ukhardy07 (Tue 16-Aug-16 18:52:27)

In reply to a post by ukhardy07:

It appears if openreach equipment is at fault on the users property, e.g. a faulty jelly crimp outside in a BT66 box, the end user would be charged, even though it is pre-NTE. It says they charge "Repairing damaged lead in wiring (from terminating point of drop wire/underground feed to NTE)."

Is that not against standard openreach guidelines, where upto the NTE5 is not the consumers liability?

I would interpret "damaged" as vandalised or accidental physical damage such as a cable cut or drilling through the cable. In these scenarios, it is arguably just for the CP to charge. If, however, there is a fault on the network side of the demarcation point, such as a faulty jelly crimp, I would argue that is not "damaged" and therefore falls outside the scope of this particular charge.

They have no authorisation to do anything beyond the test socket, of course they can do stuff like fit an interstitial plate to resolve wiring issues

Yes. At the time I posted that I assumed they were telecoms engineers like Quinns/Kelly's and may have authorisation for master socket replacement, not just visiting help desk people.

Quinns/Kellys will only have authorisation when contracted by Openreach, and even then that was the period of time with really bad fault rates (i.e. the period of stats that are most often quoted in current campaign for separation)

how can a customer avoid using a filter? if you try to plugin a modem directly to the phone part of a nte5 it wont physically fit.

Filtered faceplate.

I assume you have self install rather that an managed one !!!

they will then test to see what to get a NTE and whether this issue is internall
if that is the case you will proably have to fund an engineering to get a faceplate change

then it is filtered. He said no filters.

Who did, and where?

In reply to a post by Chrysalis:

how can a customer avoid using a filter? if you try to plugin a modem directly to the phone part of a nte5 it wont physically fit.

Very common setup in homes.

Telephone line enters the property. There is a master socket and then lets say 2 extensions.

Home owner connects up their router and a cordless phone in the master socket using a filter.

Then in the living room, they connect their sky box directly to one of the extension phone sockets, and do not use a filter.

Then in the kitchen, theres a phone socket, homeowner connects a secondary landline, again without a filter.

Speeds plummet.

Edited by ukhardy07 (Fri 19-Aug-16 11:02:02)

ok do you meaning unfiltered voice devices rather than unfiltered dsl devices.

I have still yet to see one of these common setups where people have a socket almost in every room Almost everyone I know just has a master socket and thats it, but then again I dont know many people living in large houses. Just normal semi detached 2/3 bed's.

Isn't a filtered socket supposed to filter out all voice data including from other external sockets.

On the flip side my property does have 2 ntl phone sockets. But when I had cable both didnt work at same time, I had a choice of which one ntl would connect to.

All of the "xDSL splitters" that I have examined to date, are "straight-through" on the side labelled "Modem", "xDSL" etc, so that side continues to also carry the "traditional" phone services, particularly Voice.

Apart from checking on various circuit diagrams, I have opened one up, to confirm the above.

So if you manage to plug a conventional phone in to the "Modem" socket on such a splitter, the phone will continue to operate.

--------

The "Phone" side only of those xDSL Splitters, does have an HF Reject Filter in series, so preventing the xDSL signals reaching any phone or other device plugged in to that side, "seeing" the Broadband signals.

So if you manage to plug a modem in to the "Phone" socket on such a splitter, the modem should NOT work, as the Broadband signals are rejected by the HF Reject Filter circuitry in series.

Occasionally with a poorly designed Splitter, a modem may manage to work - but this would be very slowly probably..

I have carried out tests, using up to 5 xDSL splitters in the appropriate Series configuratons - having suitable RJ11 to RJ45 adaptors.

-------------------

My phone wiring "grew like topsy", being a real mixter-maxter developing from about 1974, with extensions added at various times.

We had two outlets/phone sockets even then - much to the amazement of visitors.


For many broadband years, I used one of those original extensions for Dial-up, ADSL and recently VDSL, using such a splitter on all of the in-use extensions.

The NTE is one of the simple RJ11 type, no built-in filter - and not upgradeable in itself - only by replacement - but in a hard-to-reach location.

Recently, I did install an Ethernet cable from it to the modem, using a VDSL splitter at the ancient NTE.

All of the phone extensions were already terminated in one RJ11 plug, so it simply went in to the "Phone" side of that VDSL splitter, leaving all of the existing splitters, mainly ADSL, in situ, so that if necessary (unlikely), I can revert quickly to the earlier set-up.

The Ethernet cable etc improved my BB by about 0.2 Mbps Download from 36.9 to 37.2 Mbps, on a 40/10 contract.

No obvious improvement on the Up-load side.

-------

I have about 5 wired phone outlets, two with conventional phones connected, plus two cordless-phone systems using two more of the wired outlets, with 3 handsets on the older cordless system and its base unit also acts as a fixed handset; and two handsets on the newer cordless system (not as good as the older one!).

Plus two mobile/cell phones.

So 8 "phones" in a typical 3 bedroom, two public rooms and usual "offices" house - AND still we seem to need more!

I expect the majority of houses with telephones have extension sockets. Pre-cordless phones it was essential if you wanted phone access in more than one room.

Some people may have removed extensions when decorating, once they have cordless, but what then about Sky boxes?

In reference to helpforum.sky.com/t5/Archived-Discussions/Do-you-need-to-have-a-tel...:

If you have a Sky+HD box (except a Thomson) connected to the Internet with the latest software your box will be able to do the following over the Internet:
Make monthly callbacks to Sky
Make PPV purchases such as Sky Store and Box Office
Access limited interactive services.

Single box households are not required to have their box connected to a phone line
New multiscreen customers (on or after 18th December) are not required to have their box connected to a phone line only an Internet connection where possible.
Existing multiscreen customers (before 18th December) are currantly still required to have their box connected to a telepone line

In reply to a post by RobertoS:

Some people may have removed extensions when decorating, once they have cordless, but what then about Sky boxes?

As BatBoy has pointed out, Sky are moving towards boxes only requiring a Wi-Fi connection if there is any requirement for the box to be connected.

Of course, if the Sky hardware supports wired Ethernet, I would that as a better option than Wi-Fi if the necessary cabling exists or can easily be installed. Considering how congested 2.4GHz is in many areas, it is better to avoid moving multiple gigabytes of on-demand viewing over Wi-Fi if possible.


The dial-up modem is rapidly becoming obsolete. At one point, I wouldn't have considered travelling without a modem and cable in my laptop bag in case I needed a fax machine or had no other way to get online. My last laptop didn't have an internal modem and I chose not to buy a USB modem because I felt it was unlikely to get used; many hotel rooms don't have a wired phone these days. I haven't got a USB modem for my current laptop either; dial up Internet is too slow and expensive to be worthwhile these days, whilst I've not needed a fax machine for some time.

Devices needing connectivity (Internet of Things etc.) have all switched to Wi-Fi, Bluetooth or other wireless technologies. Smart meters typically use the mobile networks. Other than fax, which still has some fringe applications and is no longer supported by modern mobile phones, alarms are the only other mainstream non-voice application of a landline I can think of that remains relevant. Of course, the better wired alarms use Redcare, which doesn't use a normal plug and socket.

My post was simply a reply to:-

In reply to a post by Chrysalis:

I have still yet to see one of these common setups where people have a socket almost in every room

I am well aware of modern technology, as I thought I made clear.

BatBoy's post did not just cover these technologies, but also the historic aspects to which I had referred.

In reply to a post by RobertoS:

I am well aware of modern technology, as I thought I made clear.

I do not doubt that, Bob! My point was that the uses for extension sockets are waning and in many cases it is best to disconnect them or fit a faceplate filter.


My brother and sister in law have awful ADSL2+ where they live. FTTC is available, but they are so far from the cabinet that they are unlikely to get a significant speed increase.

Their house has an old LJU1/1A or LJU2/1A master mounted on the skirting board (I can't remember whether it is the 55 x 55mm LJU1 or the 68 x 68mm LJU2 offhand, and it's 250 miles from here so I can't easily check). From there, there was an internal twisted pair cable running to an IDC block terminal under the stairs, from where star wired extensions run all over the house using a mix of good quality twisted pair and total rubbish flat cable. It's a 1970s house, with the sort of setup Chrysalis describes with sockets in almost every room.

If they had an NTE5, I would have fitted a faceplate filter. As their Home Hub 4 and cordless base station are both connected to the master and their Sky box only has Wi-Fi connectivity, I chose to disconnect the twisted pair cable running to the extensions from the back of the master. After pulling the wires out of the blocks using the hook on an IDC tool, I cut off the damaged tips of the wires and wound the remainder of the wires neatly round the cable in the back of the box.

Sadly, this resulted in slightly better speed but did nothing for the reliability problems they had failed to mention before I started troubleshooting their wiring. It turns out that they have dreadful problems with intermittent noise on voice calls and their router disconnecting, which suggests an unresolved bad joint somewhere. Unfortunately, they refuse to pursue it with their ISP, which is a shame as I think they would have much more reliable service if the fault is fixed. They may also finish up with an NTE5 in place of their existing master. At least if they pursue it now, there is no chance of their internal wiring being blamed as it has been disconnected!

Please stop!

I
know
all
this.

I repeat! I was replying to a poster questioning whether anybody has multiple sockets. Nothing more, nothing less.

I did not give a lecture, and I did not ask for two of them. Neither did the poster I replied to. I gave him a short, relevant answer.

You know it, Bob, and I know it - but there is still widespread ignorance that extension wiring that has often become redundant and ignored might be wrecking broadband performance. Some houses, especially those at the more upmarket end of the scale, can be full of extension wiring that remains unaddressed now that engineer installs and any form of "truck roll" are unusual.


Threads like this are not necessarily about educating each other - there was never any need for that. It is, to some extent, about those who are reading.

Let's leave it there, rather than splitting more hairs or drifting further from the OP's problems.

In an ideal world you have just one socket.

Reality is that dial up was hard wired, so this often meant a socket running from the master to the study.
Sky boxes used to be hard wired, again they commonly go in extension sockets. In many homes the master is in the hallway, the sky box isn't here.

Then you have the pre 2000s where cordless phones were barely used. So many homes have an extension socket running to the master bedroom to take calls there.

I think in most 3 bedroom semis you will find a socket tucked away somewhere, such as behind a bedroom wardrobe or behind a desk in the study or close to the sky boxes in use.

I have lived in 5 houses in the past 10 years, all of which have not had just one master socket.

Edited by ukhardy07 (Sat 20-Aug-16 16:17:21)

Only just logged bag in and seen the back and forth re:filters and sky boxes.
Thanks for that.... I guess?

Back to the point of the post however, the old junction box is now gone and in its place is a new OR NTE5, complete with VDSL port.

I have run a cat5e cable terminated into the unfiltered A and B inside the socket into the room where the router is, with RJ11 end crimped on

Now the download speed is syncing at 13465kbps a huge step up on the ~2000kbps he was getting before.

personally, I think that VDSL should be engineer install only, there must be many many more customers in similar situations who either don't know or don't care enough to raise this as a fault with their supplier

Edited by connormill (Sun 21-Aug-16 22:50:49)

That's much better!

What speeds were you getting on ADSL?

Care to upload stats from the HG633 assuming you have the Talktalk default router.

Brilliant!

Clearly you/he didn't wait the mythical ten days. Was there any quibble about that, and any charge made? Or don't you know yet if there will be a £50?

I hope he gave you a thank-you cup of coffee .............. [chuckle]

In reply to a post by connormill:

personally, I think that VDSL should be engineer install only, there must be many many more customers in similar situations who either don't know or don't care enough to raise this as a fault with their supplier

How true, but it will cost money! And all that ISPs want is to sell a product as cheap as possible ignoring the fact that their customers could get a better connection for just a little more.

In reply to a post by ukhardy07:

That's much better!

What speeds were you getting on ADSL?

Care to upload stats from the HG633 assuming you have the Talktalk default router.

ADSL was about 1.2mbps

I will get the stats from the router on Wednesday, I'm going round to install a pair of Ubiquiti NanoBeam radios to link this connection to an office he built in the garden.

previously he had 2 x ADSL lines, each getting sub 2mbps. now he'll have 13mbps shared between the "office" and house, much better and cheaper

Back at the house today, and here are the current line stats:

Upstream line rate (kbit/s): 1017
Downstream line rate (kbit/s): 13083
Upstream noise safety coefficient (dB): 6.1
Downstream noise safety coefficient (dB): 4.9
Upstream interleave depth: 1
Downstream interleave depth: 1
Line standard: VDSL2
Upstream line attenuation (dB): 10.9
Downstream line attenuation (dB): 31.2
Upstream output power (dBm): 0.4
Downstream output power (dBm): 8.8
Channel type: Fast
DSL up-time: 5 days 22 hours 25 minutes 11 seconds

So, overall considerably better than with the old wiring setup. over 10mbps gained in sync speed

Quite correct about the filters / splitters being straight through on the modem / DSL / data side.

It's something that irks me frequently when the only device attached to a line is a DSL router and when requesting support the helldesker insists that a filter must be in place for the router to work correctly. They tend to get even more confused when the line is run directly into a structured cabling cabinet.

In reply to a post by GeeTee:

helldesker

This word should be in the OED.

Edit: Sorry to bump a large old thread just for that.

Edited by deleted (Tue 30-Aug-16 20:57:37)

Thanks for your confirmation.

For some time, I have wondered about the input/output side of the corresponding modems.

I opened up two last weekend - very difficult to see the connections onward from that socket; but the first item appears to be an Isolation Transformer in both.


Both had Surface-Mount components in the immediate vicinity.

One had an SM Capacitor and an SM Resistor, plus apparently a traditional Resistor.

The other had an SM Capacitor and three SM Resistors.


The specific type of component was determined by the Component Letter and Numbering systems, printed in white on the surface of the PCBs, eg C321 - Capacitor 321 (simple numbering).