Access Termination Unit (ATU)
5 Access Termination Unit (ATU)
5.1 Overview
This section describes the ATU, which implements the indoor part of a
MINI-LINK TN R3 Edge Node. It can be used for transmission of PDH and
Ethernet traffic. For more information on Ethernet traffic, see Section 3.6 on
page 31.
The ATU is a self-contained unit, with a height of 1U, for installation in a
standard 19" or metric rack. It can also be mounted on a wall or put on a desk.
The ATU provides unprotected (1+0) microwave transmission, within the 6–38
GHz frequency bands using C-QPSK modulation, when connected to an RAU
with antenna.
An NE with ATU utilizes the same outdoor part as an NE with AMM. In addition
to this section, the following sections provide important information:
• Radio Unit (RAU), see Section 4.3 on page 69.
• Antennas (1+0 configuration), see Section 4.4 on page 76.
• Transmit Power Control, see Section 4.7 on page 90.
• Performance Management, see Section 4.8 on page 92.
From a technical point of view, two categories of ATU can be identified:
ATU Provides traffic capacity from 2x2 to 17x2 Mbit/s that can be
shared between PDH and Ethernet traffic. Each ATU variant has
a specific default functionality which can be extended with an
optional feature, for example if both traffic types should be used.
For more information on ATU variants and optional features, see
the Product Catalog.
For more information on ATU, see Section 5.2 on page 94.
ATU C Provides traffic capacity from 2x2 to 4x2 for transmission of PDH
traffic. For more information on ATU C, see Section 5.3 on page
100.
934/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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