Meanings

interpersonal messaging service

personal communication service

exchange carrier

B-ISDN

public message handling service

local area network

high speed network

high speed communication

high-speed data communication

High-Speed TDM

HATS

clock signal

retransmission

noise burst signal

Automatic Request for Repetition

automatic calling and automatic answering unit

actual recipient

receiver antenna

non-receipt notification request indication

entity end (signal)