MINI-LINKEandEMicro
3.9.2 Functional Description
3.9.2.1 Traffic Interface and Traffic Routers
The 2 or 8 Mbit/s traffic inputs and outputs are connected to/from the SMU front
and the backplane of the access module.
The traffic signals connected to the SMU front are shaped in a pulse
regenerating circuit. The clock is generated and the signal is line-coded.
The 2 or 8 Mbit/s traffic signals connected to/from the backplane are routed
to/from other MMUs or SM Us in the same access module. The routing is
done without any cabling and the interconnection is controlled from MINI-LINK
Netman or from a PC with the MIN I-LINK Service Manager (MSM).
3.9.2.2 2/8 Mbit/s Multiplexer/Demultiplexer
The four 2 Mbit/s signals are multiplexed into an 8 Mbit/s signal on the
transmitting side. The 8 Mbit/s signal is demultiplexed into four 2 Mbit/s signals
on the receiving side.
The multi plexing and demultiplexing conforms to ITU-T Rec G.703 and G.742.
3.9.2.3 8/34 Mbit/s M ultiplexer/Demultiplexer
The four 8 Mbit/s signals are multiplexed into a 34 Mbit/s signal on the
transmitting side. The 34 Mbit/s signal is demultiplexed into four 8 Mbit/ s signals
on the receiving side. The multiplexing and demultiplexing conforms to ITU-T
Rec G.703 and G.751.
3.9.2.4 Control and Supervision
A microprocessor based Control and Supervision System (CSS) is built into
all units in the access module. Its main functions are to collect alarms, control
settings and tests. Failure is indicated on LEDs on the fronts of the units.
The SMU processor communicates with other processors in the access
module through the Node Communication Channel (NCC ). The processor also
communicates with a PC through the Operat ion and Maintenance interface.
See section Section 6.1.2 on page 95 for details on the communication
channels.
The SMU processor also controls the 1+1 protection sw itching.
3.9.2.5 DC/DC Converter
The SMU is powered from one or several MM Us. The DC/DC converter in the
SMU produces secondary voltages for the SMU electronics.
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AE/LZT 110 2012 R8C 2002- 03-04
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