RAD Data comm ASMI-450 Chapter Introduction, Functional Description, Purpose and Main Features

Serial data port. The port can be ordered with V.35, RS-530, or X.21 interface (the RS-530 interface also supports V.36/RS-422/RS-442 by means of an adapter cable).

Chapter 1

Introduction

Purpose and Main Features

1.1 Functional Description

The ASMi-450 is a high-speed HDSL modem that enables long-range data transmission over one unconditioned twisted-pair line, using the High Bit Rate Digital Subscriber Line (HDSL) technology.

The HDSL technology offers a cost-effective and reliable solution for delivering high-speed data to the subscriber premises over the existing copper cables and subscriber loops of the local distribution plant.

The ASMi-450 is fully compatible with the ASMi-450C high-speed HDSL modem card, which is intended for installation in the 12-Card HDSL/Modem Hub with SNMP Management, LRS-12, offered by RAD.

The ASMi-450 can transmit full duplex over unconditioned AWG-22, AWG-24, and AWG-26 twisted pair loops. Using advanced equalization, adaptive filtering, and echo cancellation techniques, the ASMi-450 compensates for line impairments, bridged taps, and mixed cables commonly encountered in the local distribution network. Moreover, due to its high immunity to background noise, the ASMi-450 enables the transmission of multiple HDSL signals in the same physical cable without requiring pair selection.

The ASMi-450 is available in two versions, optimized for maximum range in accordance with the user's payload data rate:

∙ASMi-450/1152: can transmit data rates of n×64 kbps, where n is 1 through 18 (corresponding to data rates of 64 to 1152 kbps). Typical ranges are up to 4.5 km over AWG-24 (0.5 mm) cable, and up to 3.6 km over AWG-26 (0.4 mm) cable.

∙ASMi-450/768: can transmit data rates of n×64 kbps, where n is 1 through 12 (corresponding to data rates of 64 to 768 kbps). Typical ranges are up to 5.7 km over AWG-24 (0.5 mm) cable, and up to 4.1 km over AWG-26

(0.4 mm) cable.

Both ASMi-450 versions are available with two types of user interfaces:

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ASMi-450 Installation and Operation Manual 1-1