AT&T DEFINITY 7200 series - Manual (Page 311)

ABBREVIATIONS AB-5
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SDN Software-Defined Network
SMT system management terminal
SNA Systems Network Architecture
SO serving office (for SDN)
SW56 Switched 56 ACCUNET Service
SW64 Switched 64 ACCUNET Service
TEHO tail end hop off
TSI time slot interchange unit
TTT tandem tie trunk (network)
UDP Uniform Dial Plan (package)
UNMA Unified Network Management Architecture
VMAAP Visual Maintenance and Administration Panel
WAN wide area network
WATS Wide Area Telecommunications Service
ZCS zero code suppression (line coding)