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)

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AT&T 7300 series, 7500 series, 7100 series, 2500 series manual Sdn, Smt, Sna, Teho, Tsi, Ttt, Udp, Unma, Vmaap, Wan, Wats, Zcs