ATL TELECOM USER GUIDE
AM2048A
61
SAn
G.704 Timeslot 0 spare bit n
SDH
Synchronous Digital Hierarchy
SELV
Safe Extra Low Voltage
SNMP
Simple Network Management Protocol
TC-PAM
Trellis Coded Pulse Amplitude Modulation
TE
Terminal Equipment
TSn
Timeslot n
TNV
Telecommunications Network Voltage
USB
Universal Serial Bus
VT100
Industry standard character based terminal
V11
CCITT Recommendation V.11 Electrical characteristics for balanced double-
current interchange circuits for general use with integrated circuit equipment
in the field of data communications
V.35
CCITT Recommendation V.24 List of definitions for interchange circuits
between DTE and DCE
X.21
CCITT Recommendation X.21 Interface between DTE and DCE for synchronous
operation public data networks
2B1Q
Line code where 2 binary bits are coded into 4 (quaternal) discrete levels
12
60
ATL TELECOM USER GUIDE
AM2048A
ETS
European Telecommunications Standard
FAW
Frame Alignment Word
FIFO
First In First Out Buffer
FLASH
Non-volatile read/write memory
G.703
CCITT Recommendation G.703 (1988): “Physical/electrical characteristics of
hierarchical digital interfaces”
G.704
CCITT Recommendation G.704 (1988): “Synchronous frame structures user at
primary and secondary hierarchical levels”
G.706
CCITT Recommendation G.706 (1988): “Frame alignment and CRC procedures
relating to basic frame structures defined in G.704”
G.826
CCITT Recommendation G.826 (1996) “Error performance parameters and
objectives for international, constant bit rate digital paths at or above the
primary rate”
HD 384
Electrical Installation of Buildings (IEC 60364 series, modified)
IC
Integrated Circuit
IEC 61312-1 Protection against lightning electromagnetic impulse; Part 1 General Principals
ISO
International Standards Organisation
LED
Light Emitting Diode
LT
Line termination (Same as ELU)
LVD
Low Voltage Directive
M.2100
CCITT recommendation M.2100 (1995) Performance limits for bringing into
service and maintenance of international PDH paths, sections and
transmission systems.
NT
Network Termination
NTU
Network Terminating Unit
NTP
Network Termination Point
PC
Personal Computer
PCB
Printed Circuit Board
PCM
Pulse Code Modulation
PDH
Plesiochronous Digital Hierarchy
RAM
Random Access Memory
