Hello all,
Some of my customers expressed reluctance to go for triband as it would need a rewiring of the parallel phones through the splitter. Some existing ones too are using the service at half the speed and even frequent hangups due to parallel phones. They cannot rewire their offices.
This gives me an idea that instead of rewiring the lines through the splitter, if we could add extra splitters at every phone point, then this should do the same job. Are these splitters available seperately or do they come with the modem only? Another option would be to copy the filter circuit. As I have only one working set, I don't have the heart to open it and tinker around but my guess is that it is a simple capacitor and inductor circuit. A series low impedence inductor with the phone output will allow low frequencey phone signals to pass and offer high resistance to the high freq. adsl signals. A low capacitance series capacitor with the adsl output will allow high freq. adsl sigs. but block the low freq. phone signals.
So if we can get the value of the series inductance for the phone output, we can buy it from the market and connect it in series with all the parallel phones and thus avoid rewiring. JTD and some others have dabbled with the adsl so they could give some tips. :)
Regards,
Rony.
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On Fri, 2006-03-10 at 09:34 +0530, Rony Bill wrote:
Hello all,
Some of my customers expressed reluctance to go for triband as it would need a rewiring of the parallel phones through the splitter. Some existing ones too are using the service at half the speed and even frequent hangups due to parallel phones. They cannot rewire their offices.
IIRC, this issue has been discussed on this list a couple of times in the past few months.
***One and only one splitter is necessary***
This splitter should be installed right at the point where the MTNL "twisted pair" is entering your premise. You may have to cut the wire at the ingress point and put RJ11 connectors on each end. The splitter one "in" connector where you put the RJ11 coming from MTNL. It has two "out" connectors for (a) your telephone and (b) your DSL modem. You need to connect your existing telephone wiring (with all it's parallel connections) to (a) and believe me you are done - no rewiring etc. etc. Connect the DSL modem to (b) using a regular twisted pair extension - this would be the _only_ additional wiring required.
Whatever shortcomings, MTNL may have, at least on TriBand configuration they have put out a fairly decent User Guide for the various modems they are supporting:
http://mumbai.mtnl.net.in/triband/htm/t_details.htm#users
I found above link under the TriBand drop down menu @ mumbai.mtnl.net.in :)
If you follow the above, most of the problems your customers have had will go away. As a side benefit, you will also see an _increase_ in your DSL throughput and nil (almost) dropped connections.
Also, a word of caution - do not hang too many phones (with their ringers on) off the splitter - when the phones ring they draw current from the Tel. Exchg. I believe the DLink splitter supports a ringer equivalence of 1.0.
This gives me an idea that instead of rewiring the lines through the splitter, if we could add extra splitters at every phone point, then this should do the same job. Are these splitters available seperately or do they come with the modem only? Another option would be to copy the filter circuit. As I have only one working set, I don't have the heart to open it and tinker around but my guess is that it is a simple capacitor and inductor circuit. A series low impedence inductor with the phone output will allow low frequencey phone signals to pass and offer high resistance to the high freq. adsl signals. A low capacitance series capacitor with the adsl output will allow high freq. adsl sigs. but block the low freq. phone signals.
Not necessary - see above.
HTH,
Arun K. Khan wrote:
This splitter should be installed right at the point where the MTNL "twisted pair" is entering your premise. You may have to cut the wire at the ingress point and put RJ11 connectors on each end.
I did my own wiring at my place. This is for my customers and their premises have different structures and wiring. They don't want to touch them or modify any concealed wiring. The computers too are located far away.
The ringer load can be reduced by keeping only one powerfull ringer on, rest all off. :)
The link provided by Rajesh is interesting and I will search for the same at Lam. Rd.
Regards,
Rony.
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On Fri, 2006-03-10 at 15:59 +0530, Rony Bill wrote:
Arun K. Khan wrote:
This splitter should be installed right at the point where the MTNL "twisted pair" is entering your premise. You may have to cut the wire at the ingress point and put RJ11 connectors on each end.
I did my own wiring at my place. This is for my customers and their premises have different structures and wiring. They don't want to touch them or modify any concealed wiring. The computers too are located far away.
Aah, concealed wiring - now I understand your dilemma. It is a pity how concealed wiring is done by the contractors. They make no provision for maintenance.
In such conditions, your proposal makes sense. However, there may be an upper limit on how many of these splitters you can put in parallel. I have seen SBC/Yahoo DSL sell retail boxes (in US) with 4 such splitters which is enough for a single family home environment.
DLink sells the splitters (at least to MTNL) separately. Mine was replaced a few months ago.
Contact MaxCom Electronics (DLink dist. on Shamrao Vithal Marg/Lam. Rd area) to see if DLinks sells the splitters only.
Pls. keep us posted with your experience.
Good luck,
Arun K. Khan wrote:
Contact MaxCom Electronics (DLink dist. on Shamrao Vithal Marg/Lam. Rd area) to see if DLinks sells the splitters only.
Pls. keep us posted with your experience.
Arun, I visited MaxCom as directed and got a splitter. They sell two types D-Link original for Rs. 400/- and another brand for Rs. 200/-. I went for the cheaper one. There is no seperate one for parallel phones only. This is my speed result below while keeping my parallel phone ( through the new splitter ) engaged.
Internet connection speed results: File Size: 5000KB Time to Download: 194.693second(s) Your Bandwidth: 231.87Kbps (0.226Mbps)
I found that instead of overloading one splitter with many phones, a distributed approach with more splitters improves speed. Now the only task is to look for cheaper splitters as they are really not worth their existing prices. :)
Regards,
Rony.
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On Friday 10 March 2006 9:34 am, Rony Bill wrote:
This gives me an idea that instead of rewiring the lines through the splitter, if we could add extra splitters at every phone point, then this should do the same job.
You will change the filter input impedance by paralleling filters. This will cause the filter characteristics to change and the results can be very up predictable.
So if we can get the value of the series inductance for the phone output, we can buy it from the market and connect it in series with all the parallel phones and thus avoid rewiring. JTD and some others have dabbled with the adsl so they could give some tips. :)
No i did not "dabble", just connected adsl modems and got them working on Debian woody and sarge.
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Arun K. Khan -
JTD -
Rony Bill