Ericsson MINI-LINK TN R3 ETSI, Technical Description, Page: 11 / 150

System Overview
2.2 Indoor Part with AMM
AMM 20p
AMM 6p D
9686
INFORM
A
TION
PFU1
MMU2 B 4-34
LTU 16x2
LTU 155e/o
NPU1 B
AMM 2p B
02
03
02
03
MMU2 E 155
NPU3
AMM 6p C
07/NPU
06
05
04
03
02
08/F
AU2
01/PFU3
00/PFU3
MMU2 E 155
MMU2 F 155
NPU3
E1/DS1
E1/DS1
LTU3 12 1
E1/DS1
PFU3
PFU3
FAU2
07/NPU
06
05
04
03
02
08/F
AU2
01/PFU3
00/PFU3
PFU3
PFU3
FAU2
MMU2 E 155
MMU2 F 155
NPU3
E1/DS1
E1/DS1
LTU3 12 1
E1/DS1
Figure 4 AMMs
The indoor part consists of an Access Module Magazine (AMM) with plug-in
units interconnected through a backplane. One plug-in unit occupies one slot in
the AMM. The AMM fits into standard 19" or metric racks.
The following text introduces the standard indoor units and their main functions.
For each unit there exist several types with different properties, further
described in Section 3 on page 9 and Section 4 on page 59.
Access Module Magazine (AMM) The AMM houses the plug-in units and
provides backplane interconnection of traffic,
power and control signals.
Node Processor Unit (NPU) The NPU handles the system’s control
functions. It also provides traffic and
management interfaces.
Line Termination Unit (LTU) The LTU provides PDH or SDH traffic
interfaces.
Modem Unit (MMU) The MMU constitutes the indoor part of a
Radio Terminal. It determines the traffic
capacity and modulation scheme.
Ethernet Interface Unit (ETU) The ETU provides Ethernet traffic interfaces.
ATM Aggregation Unit (AAU) The AAU provides ATM aggregation of traffic
on E1 links.
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