Radio Terminals
4.2 Modem Unit (MMU)
4.2.1 Overview
The MMU is the indoor part of the Radio Terminal and determines the traffic
capacity and modulation. It is available in the following types:
MMU2 B
A traffic capacity agile plug-in unit for C-QPSK
modulation, used for the following traffic capacities in
Mbit/s:
• 2xE1, 4xE1, 8xE1, 17xE1
MMU2 C A traffic capacity and modulation agile plug-in unit,
used for the following modulation schemes and traffic
capacities in Mbit/s:
• C-QPSK: 2xE1, 4xE1, 8xE1, 17xE1
• 16 QAM: 8xE1, 17xE1, 32xE1
MMU2 D
A high capacity PDH plug-in unit, used for the following
modulation schemes and traffic capacities in Mbit/s:
• 16 QAM: 22xE1, 46xE1
• 128 QAM: 35xE1, 75xE1
MMU2 E 155
A high capacity SDH plug-in unit, used for the following
modulation schemes and traffic capacities:
•16QAM:STM-1+1xE1
•64QAM:STM-1+1xE1
• 128 QAM: STM-1 + 1xE1
MMU2 F 155
A high capacity SDH plug-in unit with XPIC support,
see Section 4.2.2.10 on page 68, used for the following
modulation schemes and traffic capacities in Mbit/s.
XPIC is only used in combination with 128 QAM, if not
used MMU2 F 155 has the same modulation schemes
and traffic capacities as MMU2 E 155:
•16QAM:STM-1+1xE1
•64QAM:STM-1+1xE1
• 128 QAM: 2xSTM-1 + 2xE1 (requires 2xMMU2 E/F
155)
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4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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