Lucent Technologies Comcode 108678723 manual Subnet Trunking, Virtual Path Identifier VPI

DEFINITY ECS Release 8.2 ATM Installation,	Issue 1
Upgrades, and Administration 555-233-124	April 2000
Glossary and Abbreviations
	GL-6

Subnet Trunking

A feature permitting the manipulation of digits on outgoing AAR and ARS calls, based on the selected routing preference.

SVC

Switched Virtual Connection—a virtual link established through an ATM network; the basic building block of port network interconnectivity. Two SVCs, one in each direction, are required for a bi-directional talk path between two port networks in ATM-PNC configurations.

T

TAC

Trunk access code

TDM

Time-division multiplexing

TTR

Touch-tone receiver

U

UID

Call redirection

V

VC

Virtual circuit

VCI

Virtual channel identifier—a unique, numeric tag (16-bit field in cell header) that identifies every virtual channel across an ATM network

VDN

Vector directory number

Virtual Path Identifier (VPI)

The 8-bit field in the cell header that indicates the virtual path over which a cell is routed.

W

WAN

Wide-area network