The SDE24 module can encode up to two input sources, source 1 and source 2 in real-time. The module may be configured to encode source 1 in either MPEG2 or MPEG4 (H.264) transport streams. Source 2 may be encoded in MPEG2 only. Thus each Encoder Module can output one MPEG2 stream, two MPEG2 streams, one MPEG4 stream or one MPEG2 and one MPEG4 stream. Each SDE24 module provides two sets of input connectors for NTSC composite with stereo audio. Audio is encoded using Dolby AC-3 encoding. The Drake Digital™ SDE24 standard definition encoder module receives up to two input sources via NTSC Composite with stereo audio. Input 1 on SDE24 can encode analog signals to either MPEG2 or MPEG4 (H.264) transport streams. Input 2 can encode an analog signal to a MPEG2 transport stream only. Each SDE24 Encoder Module can output as one MPEG2 stream, two MPEG2 streams, one MPEG4 stream and one MPEG2 stream. Audio output is rated as Dolby Digital™ AC-3 compliant.