There can be many reasons for this ranging from faulty cables, incorrect input/output selection, poor quality transmitter/receiver, incorrect impedance cable, etc. The 830 and 850 have low jitter, transmit/receive circuitry that exactly meet the requirements of the IEC60958 type 2 interface (SPDIF). Some equipment, such as the Panasonic SV3800 DAT recorder, allows IEC60958 type 1 (professional format often referred to as AES/EBU) to be output on the consumer format, unbalanced electrical interface (e.g. coaxial, optical). This is often the cause of communication problems between machines, for instance, when a user wants to copy a DAT to a CD with all the start ID’s converted to CD track starts (p/q codes). This is because the professional format does not pass this type of sub-code.