Table of Contents
Advertisement
Appendix A Terms and Definitions
A.1 Asymmetric Digital Subscriber Line (ADSL)
ADSL, a digital subscriber line technology, adopts the advanced digital modulation
mode. It transmits high-speed digital signals over traditional analog subscriber lines
and its downlink rate is higher than its uplink rate.
A.2 Access Network (AN)
AN is a implementation system which consists of a series of transmission entities (such
as line facilities and transmission facilities) between the Service Node Interface (SNI)
and related User Network Interface (UNI) and provides transmission bearer capabilities
necessary for telecom services. AN may be configured and managed via the Q3
management interface. Located between a service node and user terminal, AN may be
considered as a transport network unrelated to service or application. It is responsible
for cross-connect, multiplexing, and transmission, and is transparent to user signaling,
without any processing.
A.3 Asynchronous Transfer Mode (ATM)
ATM is a connection-oriented network technology. It adopts the small cells with a fixed
size at the very bottom layer. It supports voice, video and data by using a bottom-layer
technology.
A.4 ADSL Transceiver Unit (ATU)
ATU is a complete ADSL transceiver unit consisting of the discrete multi-tone
modulation module and analog front-end module.
A-1
Advertisement
Table of Contents
