Synchronization of Digital Telecommunications Networks

ABBREVIATIONS

A

AAL	ATM Adaptation Layer
AC	Alternated Current
ADEV	Allan Deviation
ADM-N	Add-Drop Multiplexer of level N
AIS	Alarm Indication Signal
AM	Amplitude Modulation
AMI	Alternate Mark Inversion
ANSI	American National Standard Institute
APLL	Analog Phase-Locked Loop
APS	Automatic Protection Switching
AS	Anti-Spoofing
AT&T	American Telephone and Telegraph Co.
ATM	Asynchronous Transfer Mode
AUG	Administrative Unit Group
AU-n	Administrative Unit of level n
AVAR	Allan Variance

B

B3ZS	Bipolar with 3 Zeroes Substitution
B6ZS	Bipolar with 6 Zeroes Substitution
B8ZS	Bipolar with 8 Zeroes Substitution
BC	Before Christ
BELLCORE	BELL COmmunications REsearch
BER	Bit Error Rate
BIP	Bit Interleaved Parity
B-ISDN	Broadband Integrated Services Digital Network
BITS	Building Integrated Timing Supply
BOC	Bell Operating Company
BPSK	Binary Phase Shift Keying
BSC	Base Station Controller
BSFR	Basic Synchronization Reference Frequency
BTS	Base Transceiver Station
BVA	Boîtier à Vieillisement Amélioré (packaging for improved ageing performance)

C

C/A	Coarse/Acquisition (code)
CBR	Constant Bit Rate
CC	Composite Clock
CCITT	Comité Consultatif International de Téléphonie et Télégraphie
CD	Compact Disc
CDM	Code Division Multiplexing
CDMA	Code Division Multiple Access
CDN	Circuiti Diretti Numerici (Direct Digital Circuits)
CDU	Clock Distribution Unit
CEP	Circular Error Probable
CKi	Clock number i out of a chain ...