150-431-115-01, Revision 01
Overview
HLU-431 List 1E
September 22, 1998
1
O
VERVIEW
The PairGain
®
HiGain
®
HLU-431 List 1E is the Central Office (CO) side of a repeaterless, T1 transmission
system. When used in conjunction with a remote unit or 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 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 GR-63 CORE, TR-TSY-000499 and GR1089 CORE.
N
EW
F
EATURES
•
Selectable DS-1 pre-equalizer
•
140 to 200 Vdc HDSL line power for doubler and HRU-412
•
Front panel HDSL S/N margin display
•
Compatible with any 400 mechanic shelf
•
Selectable loopback activation codes
•
RS-232 maintenance port
•
Shelf Management interface
•
Non-volatile front panel operator setup
•
Front panel DS1 splitting and bridge access
•
Lightning and power cross protection on HDSL interfaces
•
784 kbps full duplex 2B1Q HDSL transmission on two pairs
•
Front panel status indicating LED
•
On / Off front panel display power cycling
•
DS1 LOS detector (125 consecutive zeros)
•
Margin threshold alarm
•
HDSL AIS and Smart-Jack AIS options
•
Easy return to factory default user settings
•
Circuit ID option
•
Low power consumption