150-388-125-01, Revision 01
Overview
HLU-388 List 2E
September 15, 1998
1
O
VERVIEW
The PairGain
®
HiGain
®
HLU-388 List 2E is the Central Office (CO) side of a repeaterless T1 transmission
system. When used in conjunction with a HiGain Remote Unit (HRU) the system provides 1.544 Mbps
transmission on two unconditioned copper pairs over the full Carrier Service Area (CSA) range. This line unit can
be used in applications with or without HiGain doubler units (HDUs).
The CSA includes loops up to 12,000 feet of 24 AWG or 9,000 feet of 26 AWG wire, including bridged taps. The
HiGain system uses HDSL transmission technology as recommended by Bellcore TA-TSY-001210. The HiGain
system complies with TR-TSY-000063 (Network Equipment Building System (NEBS) Generic Equipment
Requirements) and TR-TSY-000499 (Transport System Generic Requirements (TSGR) Common Requirements).
F
EATURES
•
Selectable DS1 pre-equalizer
•
130 to 200 Vdc HDSL line power for doubler and HRU
•
Front panel HDSL Signal-to-Noise margin display
•
Compatible with high-density Span Terminating Shelves (STS)
•
Selectable loopback activation codes
•
RS-232 Craft port for connection to a maintenance terminal
•
Compatible with PairGain Management System
•
Front panel operator setup
•
Lightning and power cross protection on HDSL interfaces
•
Full duplex 2B1Q HDSL transmission at 784 kbps on two wire pairs
•
Front panel status LED
•
On/off power cycling from front panel
•
DS1 Loss Of Signal (LOS) detector (125 consecutive 0s)
•
Margin threshold alarm
•
HDSL Alarm Indicator Signal and SmartJack AIS options
•
Easily restored factory default settings
•
Circuit ID option
