... 1~30 FXO FXS RS232 V35 Eth G64K E&M voice mux, telephone extender, voice multiplexer, DLC PCM multiplexer POTS over ... E1 with 1~30( FXO FXS RS232 V35 ETH G64K E&M ... multi-service accession; It converts multi-voice interfaces (including telephone, 2/4 lines audio frequency, 2/4 lines EM, ... 1~30 FXO FXS RS232 V35 ETH G64K E&M ) over E1