6UE1D

This mezzanine board provides a full-duplex, balanced CEPT-E1 interface for the VME6U6. Alternate Mark Inversion (AMI/HDB3) and NRZ interfaces are supported with the necessary electrical isolation and protection circuits.

The NRZ interface is optically isolated balanced differential compatible with RS422 and MIL STD-188-114. The NRZ data rate is externally determined (up to 4 Mbps).

Incoming E1 data is demultiplexed and placed on the TDM subsystem on a time-slot by time-slot basis. Data taken from the TDM subsystem is multiplexed onto the outgoing E1 data stream. The host application determines the TDM configuration allowing the DSP32Cs to read and write E1 data without having to be aware of the E1 framing format. In addition to the standard 2.048 MHz E1 rate, TDM clock rates of 4.096 or 8.192 MHz can be locked to the E1 frame rate, providing higher TDM bandwidths.

The 6UE1D includes a TDM expansion interface to link clusters of VME6U6 boards on their own TDM bus. Each cluster is controlled by its own tdm map as it routes data among its dsps and their resources. The 6ue1D bridges these local tdm buses on a time-slot basis.