Overview; Features; Applications - ADC HiGain HLU-200 List 2D User Manual

150-200-124-02, Issue 2
O
VERVIEW
®
The HiGain HLU-200 List 2D is a HiGain Line Unit (HLU) that plugs into any channel unit slot of a
®
Litespan 2000 Channel Bank Assembly (CBA). Within Litespan, it is called an Asynchronous High-bit-rate
Digital Subscriber Line (AHDSL) channel unit. When plugged into the CBA and paired with a HiGain Remote
Unit (such as an HRU-412), the HLU-200 provides an AHDSL interface capable of 1.544 Mbps transmission on
two unconditioned copper pairs over the full Carrier Service Area (CSA) range. (This includes loops of up to
12,000 feet of 24 American Wire Gauge [AWG] or 9,000 feet of 26 AWG, including bridged taps.)
The HiGain system uses High-bit-rate Digital Subscriber Line (HDSL) transmission technology
as recommended by Bellcore TA-TSY-001210 and complies with the requirements found in
TR-TSY-000063 (Network Equipment Building System [NEBS] generic equipment requirements)
and TR-TSY-000499 Transport System Generic Requirements (TSGR).
F
EATURES
The HLU-200 List 2D has the following features:
• Lightning and power-cross protection on HDSL interfaces
• 784 kbps full-duplex 2 Binary, 1 Quaternary (2B1Q) HDSL transmission on two pairs
• Front panel status Light Emitting Diodes (LEDs)
• Margin threshold alarm
• Low power consumption
•
Compatible with the Litespan 2000 integrated management system called Litecraft™ Pro.
A
PPLICATIONS
The HiGain system provides a cost-effective, easy-to-deploy method for delivering T1 high capacity service over
two unconditioned, non-loaded copper pairs. Conventional in-line T1 repeaters, cable pair conditioning, pair
separation, and bridged tap removal are not required. For typical HLU-200 applications see
General guidelines require the HDSL loop to have less than a 35 dB loss at 196 kHz with 135Ω driving and
terminating impedances and to otherwise comply with CSA guidelines. The HiGain system operates with any
number of other T1, Plain Old Telephone Service (POTS), Digital Data Service (DDS), or other HiGain systems
sharing the same cable binder group. HiGain systems can be used for customers requiring Digital Signal,
Level 1 (DS-1) service on a temporary or permanent basis. The HiGain system also provides a means of quickly
deploying service in advance of fiber-optic transmission systems. With the HiGain system, service can be
provided within hours. Fiber optic systems can then be installed over time to be cut in when convenient to do so.
After fiber optic installation and connection, the HiGain system can be easily removed and utilized elsewhere.
The HLU-200 operates as a channel card within an Alcatel Litespan 2000 Channel Bank. The Litespan 2000
system consists of a Central Office (CO) bank connected to a remote bank over an OC3 fiber link. Each bank has
slots for 56 channel plug-in cards. Typically, the HLU-200 List 2D is installed in the remote bank where it is used
to transmit a T1 payload to a remote HRU over two unconditioned HDSL cable pairs (with or without doublers).
This HLU-200 is equivalent to an AT1U channel unit (used to transmit a T1 payload to a remote location over
conventional T1 spans).
HLU-200 List 2D February 10, 1999

Overview

Figure 1 on page 2.
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