Plain Old Telephone Service and xDSL signals

[OB_1]

Hello everyone,
I'm asking if anybody can refer me to some technical documentation on how the plain old telephone signal and the xDSL signals are mixed together and driven on copper pairs from the central office to subscriber and vice-versa. Any source would be fine: web sites, books, societies …
Thanks!!

 

[mvs sarma]

https://www.etsi.org/deliver/etsi_tr/102100_102199/102139/01.01.01_60/tr_102139v010101p.pdf

This paper could be of some use. All the best.

 

[OB_1]

Thanks mvs sarma,
I already gave a look to ETSI and ITU recommendations, but they give a general guideline without entering in the hardware details. I found something in the applications notes of some companies delivering SLIC (Subscriber Line Interface Circuit) and SLAC (Subscriber Line Access Circuit).
If anyone can better address me, thanks in advance!

 

[sivamani]

Frequency is different for POTS and ADSL.

 

[GUMY]

POTS uses frequency bend 400Hz to 4KHz, ADSL over POTS line uses 25KHz to 138KHz for upstream and 138 to 1104KHz for downstream. At central office and at subsriber side, signals are mixed/splitted with passive filter (ADSL splitter). You should Google "ADSL splitter" !

 

[sivamani]

Refer

https://en.wikipedia.org/wiki/Asymmetric_digital_subscriber_line

for better idea

 

[OB_1]

Thank you guys, I've already worked on that stuff, but I really need to get in-deep details. Thanks anyway

 

[crutschow]

You might try looking for DSL ICs. The manufacturers of those should have ap notes that explain the operation.