The EM2-VR combines a bi-directional 2-wire or 4-wire voice signal with a full duplex RS232 data channel, and transmits it over a 64 kbps synchronous E0 or DS0 channel with a V.35 interface.
At the remote end which may be another EM2-VR or an EM200-VR, these combined data/voice signals are separated, and output on their respective connectors. Note that when using a DS0 channel in a T1 carrier, there must be no “robbed bits”.
The voice channel supports E&M signaling and a high quality voice which is compressed to 40 kbps.
The RS232 channel is data format and speed transparent to rates of 19.2, 9.6, 4.8, 2.4, and1.2 Kbps and less.