Appendix B: Abbreviations
150-402-102-01, Revision 01
56
July 27, 1998
HRU-402 List 2
DLC
Data Link Control
DS1
Digital Service, Level 1
DSX-1
Digital System Cross-connect Frame
EN
Enable
ES
Errored Seconds
ESF
Extended Super Frame
ESF DL
Extended Super Frame Data Link
FRN
Frame
HCDS
High Capacity Digital Service
HDSL
High-bit-rate Digital Subscriber Line
HDU
HiGain Doubler Unit
HLU
HiGain Line Unit
HRE
HiGain Remote Enclosure
HRU
HiGain Remote Unit
I-CPE
Interface-Customer Premises Equipment
LBK
Loopback
LCD
Liquid Crystal Display
LED
Light Emitting Diode
LOS
Loss of Signal
LOSW
Loss of Sync Word
LPWR
Local Power
LVL
Level
NEBS
Network Equipment Building System
NET
Network
NI
Network Interface