Applications - ADC HiGain HLU-200 User Manual

150-200-114-03, Issue 03
HLU-200 List 1D features:
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RS-232 maintenance port
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Lightning and power cross protection on HDSL interfaces
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784 kbps full-duplex 2B1Q HDSL Transmission on two pairs
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Front panel status indicating LEDs
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Margin threshold alarm
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Upgradeable to HLU-200 List 2D (AHDSL) line unit
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Low power consumption
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Doubler compatible.

Applications

The HiGain system provides a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital
Service (HCDS) over metallic pairs. The fiber-like quality service is deployed over two unconditioned, non-
loaded copper pairs. Conventional inline T1 repeaters are not required. Cable pair conditioning, pair
separation and bridged tap removal are not required. See Figure 2 for typical HLU-200 applications.
General guidelines require that each HDSL loop have less than 35 dB of loss at 196 kHz, with 135 ohms
driving and terminating impedances and comply with CSA guidelines. The HiGain system operates with any
number of other T1, POTS, Digital Data Service (DDS), or other HiGain systems sharing the same cable binder
group. HiGain systems can be used for customers requiring DS1 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 be installed at
a leisurely pace and cut-over from the installed HiGain system when convenient to do so. The installed HiGain
system can then be easily removed and utilized elsewhere.
The HLU-200 operates as a channel card within a DSC Litespan-2000 Channel Bank. The Litespan-2000
system consists of a CO bank that is connected to a remote bank over an OC3 fiber link. Each bank has slots
for 56 channel plug-ins. The HLU-200 List 1D is typically installed in the remote bank where it is used to
transmit a T1 payload to a remote HRU-412 over two unconditioned HDSL cable pairs, with or without
doublers. It is the HDSL equivalent to an AT1U channel card, which is used to transmit a T1 payload to a
remote location over conventional T1 spans. The HLU-200 List 1D is compatible with software releases 7.1.x
and 8.1.x and above, of the Litespan-2000 system. The List 1D is not compatible with the Litespan-2000
Management System and must be maintained, provisioned, and monitored from its front panel RS-232 port.
The List 2D HLU-200 (AHDSL) line unit will provide integrated management and will be compatible with the
Litespan-2000 TL1-based Network Management System and the Litecraft Management System in version 8.1.
However, the List 1D has a spare Interface Control Processor (ICP) socket, see Figure 5. This holds the ICP
which is required for integrating the HLU-200 LIST 1D into the Litespan-2000 Management System. This
allows a List 1D unit to be returned to the factory for easy upgrading to the List 2D configuration. The HLU-
200's timing is not synchronized to the Litespan bank timing, but runs asynchronously with respect to it.
The HLU-200 can be cross-connected to another HLU-200 or another asynchronous T1 channel unit within its
own channel bank or in the distant channel bank. This is shown in Figure 2, where test access at either the
remote or local ends can be accomplished by use of ADS1U and AT1U line cards. These point-to-point
dedicated circuits are initiated by issuing the standard TL1-based cross-connect commands to the Maintenance
and Test Interface (MTI) card, which identifies the HLU-200 List 1D as an AHT1U plug. See Installation,
Maintenance, and Provisioning section for more details.
HLU-200 List 1D November 22, 1996 3