150-357-200-02, Issue 2
Appendix D - Glossary
HXU-357 List 1
February 9, 1999
63
A
PPENDIX
D - G
LOSSARY
ACO
Alarm Cut Off
DSX-1
Digital System Cross-connect
frame
AIS
Alarm Indicator Signal
DTE
Data Terminal Equipment
ALM
Alarm
DTR
Data Terminal Ready
AMI
Alternate Mark Inversion
ES
Errored Seconds
B8ZS
Bipolar with 8-zero Substitution
ESF
Extended Superframe
BCD
Binary Coded Decimal
FEAC
Far-End Alarm Code
BER
Bit Error Rate
GND
Ground
BPV
Bipolar Violation
HCDS
High Capacity Digital Service
BPVT
BPV Transparency
HDSL
High-bit-rate Digital Subscriber
Line
CDU
Customer Doubler Loopback Unit
HDU
HiGain Doubler Unit
CI
Customer Interface
HFA
HiGain Fan Assembly
CO
Central Office
HLU
HiGain Line Unit
CLOC
Customer Local Loopback
HMU
HiGain Management Unit
CPE
Customer Premises Equipment
HRU
HiGain Remote Unit
CRC
Cyclic Redundancy Check
HTC
HiGain Test Card
CREM
Customer Remote Loopback
HXU
HiGain Multiplexer Unit
CSA
Carrier Servicing Area
IP
Internet Protocol
CSU
Channel Service Unit
LOS
Loss of Signal
DCE
Data Communications
Equipment
LOSW
Loss of Sync Word
DDS
Digital Data Service
M13
Multiplexer from DS1 to DS3
DL
Data Link
MDF
Main Distribution Frame
DS1
Digital Signal Level 1
MIB
Management Information Base
DS3
Digital Signal Level 3
NDU
Network Doubler Unit
DSR
Data Set Ready
NEBS
Network Equipment Building
System