Nortel DMS-10 Series Installation, Operation And Maintenance Manual page 706

9-6 List of terms
SDI
Serial Data Interface
SIO
Serial Input/Output
Circuitry in the BMC that passes data from the BMC to external devices. The
BMC employs four such circuits in its Quad SIO PCA that provides
communications paths between the BMC, the Switching System maintenance
terminals, and the remote polling center link.
TEC
Tape Emulation Circuit
A circuit of the BMC that accepts AMA data from the DMS-10 MTPs. The
TEC emulates an MTD on DMS-10 MTPs, duplicating all of the
communications signals normally exchanged between the DMS-10 and an
MTD.
297-6201-502 Standard 01.02 September 2000