Sorry dont understand what you want to say with this?
But first I have to correct myself!
I mixed up a little bit with 7590 which I use and forgot that 7582 and 7583 have an RJ11 connector for xDSL and no ISDN support!
7583 even have line bonding support, so you can double speed with 2 lines.
First there is no issue to use an RJ11 plug in RJ45 socket (only for 7590).
Usually the inner (middle) pins are line on almost all devices.
And ISDN like POTS use this 2 pins for their signal, the only difference is that POTS uses analog 300-3,4kHz and ISDN is modulated with 120KHz. ISDN-So bus with 4 pins will only be behind the ISDN-NT (network termination) used to connect upto 8 ISDN phones directly to it in parallel.
After the splitter its the same DSL-signal with Annex A and B, only B wont use cut off lower spectrum while A can do so. And there is a Annex_M too, but dont know the difference.
An RJ11 to RJ45 adapter (for 7590) is included with the router to connect Y-cable to the splitter and back to the phones or you can use RJ11-ports Fon1 and Fon2 for your analog phones.
The back-phone signal goes to the next inner pins while if you use ISDN the outer 4 pins will be used, there are 2 different adapters included to do so.
But that all not relevant for 7582 or 7593!
They have only DSL input signal pins used on their DSL-port. Y-cable only with 7583 for bonding 2 lines.
Both dont support POTS over the box nor ISDN, you have to use a splitter for POTS as usually.
Thats different to 7590 where you may run POTS into the box, use the recorder, fax-box and DECT together with POTS or even ISDN over the box.
7582 and 7583 cant do so, only if you have VoIP it will go through the box with all its phone features. In Austria all new lines run VoIP or can be changed to VoIP, POTS is dying. So thats not an issue so far here.
All you would need is RJ11 adapter to your local phone plug if they use something different!
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