LTPH-UM-1109-01, Issue 1 Overview
H2TU-C-231 List 2 January 9, 2002 1
OVERVIEW
The H2TU-C-231 List 2 line unit is the Central Office (CO) side of a T1 transmission system. The HiGain™
HDSL2 product family is fully compliant with the HDSL2 standard ANSI T1.418-2000. Providing full-rate T1
access using just a single copper pair,HDSL2 is a cost-effective solution that offers anopen architecture. The open
architecture inherent in HDSL2 guarantees interoperability allowing simple and economic accommodation of
network growth.
HiGain HDSL2 products provide 1.544 Mbps transmission on one unconditioned copper pair over the full Carrier
Service Area (CSA) range. The CSA includes loops up to 12,000 feet of 24 AWG wire or 9,000 feet of 26 AWG
wire, including bridged taps.
FEATURES
• HDSL2 transmission features
– Lightning and power cross-protection on HDSL2 interfaces
– Full-duplex HDSL2 transmission on one pair at 1.552 Mbps
– Ultra-low wander (Stratum 1 compliant)
– Grounded loop detection on High-bit-rate Digital Subscriber Line 2 (HDSL2)
– Sources sealing current when connected to any locally powered H4TU-R-402
• Front-panel provisioning features
– Four-character status display
– DS1 splitting and bridging access
– Status Light Emitting Diode (LED)
– RS-232 craft port for connection to a maintenance terminal
– Front-panel dual loopback commands
• Maintenance screens for inventory, provisioning, and troubleshooting
– DS1 and HDSL2 performance monitoring
– DS1 and HDSL2 alarm histories
– Payload (PL) and HiGain (HG) loopback source identification
– Margin Alarm (MAL) threshold
– Report menu option for downloading status and performance monitoring data to a file
– Bit Error Rate (BER) Tester (BERT)
• Network Management and Administration (NMA) interface
• Configuration options
– Selectable DSX-1 pre-equalizer
– Bipolar Violation Transparency (BPVT)
– Bit Error Rate (BER) alarm
– Power Back Off Network (PBON) and Power Back Off Customer (PBOC) options for configuring
HDSL2 transmit power levels
– Loss of Signal/Alarm Indication Signal (LOS/AIS) payload alarm
