RAD Data comm ASMI-450 - Manual (Page 19)

ASMi-450 Installation and Operation Manual 1-1
Chapter 1
Introduction
1.1 Functional Description
Purpose and Main
Features 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:
•
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).