Atrie WireSpan 3000, Руководство пользователя

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1-1
CHAPTER 1
INTRODUCTION
Overview
The WireSpan 3000/3000E is a HDSL (High-bit-rate Digital
Subscriber Line) digital modem. It provides full duplex
(bi-directional) 1.544Mb/s (T1) or 2.048Mb/s (E1) transmission
capability over two non-loaded two-wire metallic cable pairs.
Specifically, bi-directional data at a rate of 784kb/s or 1168kb/s is
transmitted and received on each pair.
Figure 1-1, 1-2 illustrated a generic dual duplex HDSL system. Each
of the High-bit-rate Terminal Units (HTU), at either the Central
Office (HTU-C) or the Remote Distribution (HTU-R) location,
consists of two pairs of digital transmitter/receiver ("transceiver"),
each connected by a two-wire CSA(Carrier Serving Area) compatible
loop.
WireSpan 3000 supports data rates of Nx64 Kbps up to 2.048 Mbps.
The DTE interface supported are EIA RS-530/V.35/RS-449/X.21. DTE
interface for data transmission support drop & insert functions.
This programmable Nx64K feature accordingly makes our WireSpan
3000 E1 HDSL DSU/CSU the best choice on applications such as
INTERNET access and leased lines service. But this feature does not
provide in WireSapn 3000E, the difference show in Figure 1-1, 1-2
for reference.