ATL Telecom AM2048 - Manual (Page 42)

ascom
telecom USER GUIDE AM768A/AM2048A
42
Issue 8
8. Glossary
A Alarm bit in G.704 frame, timeslot 0
AC Alternating Current
AIS Alarm Indication Signal
BT British Telecom
CAP Carrierless Amplitutde and Phase Modulation
CCITT International Telegraph and Telephone Consultative Committee
CRC4 Cyclic Redundancy Check 4 (bits)
CRC6 Cyclic Redundancy Check 6 (bits)
CRC6G CRC6 Generator
CRC6M CRC6 Monitor
DC Direct Current
DCE Data Circuit Terminating Equipment
DS Digital Section (Line section including ELU and NTU)
DSP Digital Signal Processing
DSL Digital Subscriber Line
DSLU Digital Subscriber Line Unit. (AM768, AM2048 CAP, AM2048 OS etc.)
DTE Data Terminating Equipment
E bit Bits in the G.704 frame used to indicate that a CRC has been received in error.
ELU Exchange Line Unit
EMC Electromagnetic Compatibility
EN 41003 Particular Safety Requirements for Equipment to be connected to Telecommunications
Networks
EN 60950
1992. Up to A11 (1997) Safety of Information Technology Equipment.
EOC Embedded Operations Channel
ESD Electro Static Discharge
ET Exchange Termination
ETR152 ETSI Technical Report 152 (1996).Transmission and multiplexing; DSL transmission
system on local lines;
ETS European Telecommunications Standard
FAW Frame Alignment Word
FIFO First In First Out Buffer
FLASH Nonvolatile 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