6UT1S and 6UT1L

These VME6U6 mezzanine boards are variations of the 6UT1D. Each has a very robust electrical protection on the AMI/B8ZS interface and the NRZ interface is not optically coupled. Software interface is compatible with the 6UT1D. The 6UT1S is a short haul transceiver with the optically coupled interface removed to improve its MTBF.

The 6UT1L long haul transceiver capable of operating over twisted-pair cable up to 6,000 feet. It can support low voltage levels of a telecom monitor.

The 6UT1S and 6UT1L boards can use the clock of the incoming T1 line to master the clock to other T1 mezzanines. They automatically transfer the robbed-bit signaling bits from the incoming to the outgoing paths, allowing inserting of channel data without special DSP code for maintaining the signaling data. With the outgoing multi-frame aligned with the incoming multi-frame, signaling bit copying is controlled by the TDM map on a timeslot by timeslot basis.