LTPH-UM-1049-02, Issue 2 Overview
H2TU-C-319 List 4E January 9, 2002 1
OVERVIEW
The H2TU-C-319 List 4E (H2TU-C) 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. Providing full-rate T1
access using a single copper pair, HDSL2 is a cost-effective solution that offers an open architecture. The open
architecture inherent in HDSL2 guarantees interoperability allowing simple and economic accommodation of
network growth.
HiGain HDSL2 products provide 1.552 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
Features specific to the List 4E family of HDSL2 modules include:
• Report menu option for downloading status and performance monitoring data to a file
• Enhanced loopback commands controlled by the SmartJack Loopback (LPBK) option as follows:
– 100 in-band loopdown command
– 100000 (1-in-6) in-band loopup command
• Connection of the HDSL2 span to Loop 2 on pins K and 9 rather than on Loop 1, pins F and 6
• Sources sealing current when connected to an H2TU-R-402 List 5E or higher
Standard features include:
• 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)
• Front-panel provisioning features
– Four character status display
– DS1 splitting and bridge access
– Status Light Emitting Diodes (LEDs)
– RS-232 craft port for connection to a maintenance terminal
– MODE and LBK pushbuttons
• Maintenance screens for inventory, provisioning, and troubleshooting
– DS1 and HDSL2 performance monitoring
– Non-volatile performance monitoring
– Performance Report Messaging (PRM) support for Supplemental PRM (SPRM) and Network PRM
(NPRM) at the H2TU-R
– Payload (PL) and HiGain (HG) loopback source identification
– Margin Alarm (MAL) threshold
