Section 150-441-124
June 12, 1997
Revision 01
Page 42
PairGain Engineering - Plant Series
HiGain HLU-D41
radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at their own expense.
28.2
UL Recognized.
The HLU-D41 is a UL Recognized component. Use normal caution when
installing or modifying telephone lines. Dangerous voltages may be present. It is also considered
imprudent to install telephone wiring during a lightning storm. Always disconnect all telephone
lines and power connections from wall outlets before servicing or disassembling this equipment.
28.3
CSA Certification.
The HLU-D41 has been tested and found to comply with CSA Standard C22.2-
950 with telecommunication features.
G. ABBREVIATIONS AND GLOSSARY
29. Abbreviations and Glossary
2B1Q
2–Bits–1–Quaternary
ACO
Alarm Cut Off
AIS
Alarm Indication Signal
AMI
Alternate Mark Inversion
BER
Bit Error Ratio
BPV
Bipolar Violation
CI
Customer Interface
CO
Central Office
CLOC
Customer Local Loopback
CLR
Clear Channel Signaling
Code type
Type of DS1 line coding used (AMI, B8ZS, AMI : ZBTSI or B8ZS : ZBTSI). The
latter two conditions indicate the code type that is being received when the HiGain
system is set to its ZBTS mode. In either the AMI or B8ZS DS1 code mode, the
Code type displays the selected code as opposed to the code type that is actually
being received, which is what is displayed when set to AUTO code mode.
CPE
Customer Premises Equipment
CRC
Cyclic Redundancy Check. A process used to check the integrity of a block of
data.
CREM
Customer Remote Loopback
CSA
Carrier Service Area
CSU
Channel Service Unit. A device used to terminate a digital channel on a
customer's premises.
DCE
Data Circuit-Terminating Equipment
DDS
Digital Data Service
Digroup
Two groups of 12 digital channels combined to form one single 24-channel T1
system.
DS0
Digital Signal, level 0. 24 DS0s (24x64 kbps) equal one DS1.
DS1
Digital Service, level 1. One DS1 is the same as one T1 (1.544 Mbps).
