Overview - ADC HiGain HLU-200 User Manual

350-200-111-02, Issue 2
O
VERVIEW
®
The ADC HiGain
asynchronous DS1 interface unit that plugs into the Channel Bank Assembly
(CBA) of a DSC Litespan
High-bit-rate Digital Subscriber Line (HDSL) interface. The HLU-200 is
essentially an AT1U line unit with the T1 line interface circuit replaced by an
HDSL interface circuit. 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 Serving Area (CSA) range.
The CSA includes loops of up to 12,000 feet of AWG 24 or 9,000 feet of
AWG 26 wire, including bridged taps. The CSA range can be doubled with a
HiGain Doubler Unit (HDU) or tripled with two HDUs.
This guide describes HLU-200 List 1A operation when used with and without
doublers. The HRU can be placed up to 3000 feet into the network for extra
range without doublers. However, this requires an external Network Interface
Device (NID) to be placed at the Network Interface (NI), and the HRU must
have the Smart-Jack (LB) option set to Disable. The HLU-200 List 1A
powers both the HDU and HRU, but the HRU must be locally powered for
two-doubler applications.
The HLU-200 List 1A is different from the HLU-200 List 1F only in that the
+5 V fuse has been increased from 0.75 A to 1.0 A for improved reliability.
HLU-200 List 1A
®
Line Unit Model HLU-200 List 1A (AHT1U) is an
®
2000 optical loop carrier system to provide a
October 4, 1999

Overview

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