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[Weaver]

[burakkucat]

xTU-C and xTU-R where x is either A or V (i.e. ADSL or VDSL), respectively, and TU is transceiver unit.

The -C device is the central office transceiver unit (i.e. the exchange or cabinet located unit) and the -R device is the remote transceiver unit (i.e. the CPE).

[Alex Atkin UK]

Could a potentiometer be used to simulate attenuation or would it introduce too much interference?

[Weaver]

[burakkucat]

Burakkucat even has an ATU-C if memory serves, so has all the hardware, no ?

Close. 

I have two devices (both made by Planet Networking & Communications) that can be configured as VTU-C. A VC-231 and a VC-230N.

[burakkucat]

Could a potentiometer be used to simulate attenuation or would it introduce too much interference?

One really needs to remember that the metallic pathway is acting as a radio-frequency transmission line in differential mode. So any inserted lump attenuation needs to be a four element pi constructed out of non-inductive resistors.

[Weaver]

[Alex Atkin UK]

Close. 

I have two devices (both made by Planet Networking & Communications) that can be configured as VTU-C. A VC-231 and a VC-230N.

I remember looking at those ages ago, was tempting to get one to see how different modems react with them or even if they would work as a modem.  A bit expensive for a toy though.

[burakkucat]

[Alex Atkin UK]

[burakkucat]

If you do ever get one, they are simplicity to set up. Just four DIP switches --

• CO or CPE mode
• Fast-path or Interleaving
• Profile: 17a or 35a
• Target SNRM: 6 dB or 9 dB

Numbers 2 - 4 only have relevance when CO mode is selected.

If you were going to use one in CPE mode, you would have to use your pfSense system to be the VLAN end-point.

[kitz]

There are iirc several of telephone museums.    BT do or did maintain a couple of their own and there is also a family/group of enthusiasts who have also set up a private one.   

I remember posting a link to some of their videos posting a couple of years ago where they had created a mini working telephone exchange with old equipment.  I also seem to recall that one of the 'engineers' was a woman who I think had learnt from her father.

[Weaver]

[Alex Atkin UK]

If you do ever get one, they are simplicity to set up. Just four DIP switches --

• CO or CPE mode
• Fast-path or Interleaving
• Profile: 17a or 35a
• Target SNRM: 6 dB or 9 dB

Numbers 2 - 4 only have relevance when CO mode is selected.

If you were going to use one in CPE mode, you would have to use your pfSense system to be the VLAN end-point.

The main reason I didn't get one was looking at the HG612 interfaces and wondering what handles PTM.  If I had known I only needed to handle the VLAN I probably would have, but with FTTP around the corner it makes no sense now.