MD-4000 is a new generation of modems for the local loop extension, the transport of legacy telecom interfaces (RS530/X21/V35/V28, E1/T1, RNIS BRi), and the transport of Ethernet local area network. MD-4000 embeds the more recent G.SHDSL technologies that have been approved by ITU and ETSI for multi-rate digital transmission over the copper local loop. The G.SHDSL mode allows data transmission on multi pair cables which can carry other services such as voice or ADSL.
- MD42xx – 2 wire
- MD44xx – 4 wire
- MD42ET / MD44ET – G.703 / G.704
- MD4230 / MD4430 – RS530 / X.21 / V35 / V28
- MD42FT / MD44FT – Ethernet
- MD 424B / MD444B – ISDN / BRI