Access Termination Unit (ATU)
5.2.1 Functional Blocks
This section describes the functions of ATU based on the block diagram in
Figure 82 on page 95.
8468
Power
USB
External Power
Supply -48 V DC
O&M
Ethernet
Modulator
Demodulator
DCC
DCC
RCC
RAU
Traffic
Traffic
E1
E1
E1
E1
E1
E1
E1
E1
10/100BASE-T
Traffic
10BASE-T
Site LAN
nxE1
nxE1
HCC
HCC
Line
Interface
Multiplexer/
Demultiplexer
Radio Frame
Multiplexer
Radio Frame
Demultiplexer
Cable
Interface
Secondary
voltages
Control and
Supervision
Figure 82 Block diagram for ATU
5.2.1.1 Line Interface
This block provides the eight E1 line interfaces for connection of PDH traffic.
It interfaces the Multiplexer/Demultiplexer block by transmitting and receiving
the traffic (nxE1).
5.2.1.2 Ethernet
This block provides the 10BASE-T interface for connection to a site LAN and
the 10/100BASE-T interface for Ethernet traffic in Ethernet bridge applications.
The Ethernet traffic is mapped on nxE1, where n16, using one
inverse multiplexer. The E1s are transmitted to and received from the
Multiplexer/Demultiplexer block.
5.2.1.3 O&M
This block provides the LCT connection. The equipment is accessed using a
local IP address.
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4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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