Multiplex Section And Regenerator Section - Siemens SRA 4 User Manual

1.4.2.2
Fig. 1.13
SRA 4 - 6/7/8/10/11/13 GHz (WB ODU) - UMN
911-381/02C0000 - Issue 3, July 2004

Multiplex section and regenerator section

In an SDH network, the "multiplex section" includes all equipment used to transport
information between two consecutive knots of the network.
Hence, it includes both the equipment (MUX or DCC) in the two knots and the possible
line repeaters, obviously in addition to the actual transmission equipment. While the
"repeater section", which refers exclusively to the single hops of a connection, include
both the transmission equipment and the two pieces of equipment they link up with.
Some examples in Fig. 1.13 are taken from Fig. 1.12.
Examples for the multiplex and regenerator section
STM-4
STM-1
140
REGENERATOR
SECTION
REGENERATOR
SECTION
Each multiplex section is assigned a part of the SOH in the STM-1 frame, or more
generally in the STM-N frame, called "MSOH" to fulfill the following functions:
– Pointers
– Automatic switching
– Parity check
– Transmission alarm
– Data channels (DCC = data communication channel)
– Service telephone channels (express)
In SDH networks, the automatic switching equipment (channel protection) are at the
level of the multiplex section (terminals).
A)
T-AU
STM-16
Fiber
R
MULTIPLEXER
SECTION
STM-16
Fiber
DXC-AU
STM-16
STM-1
DXC-TU
Radio
1 - PRELIMINARY INFORMATION
STM-4
MULTIPLEXER
SECTION
Fiber
DXC-AU
MULTIPLEXER
SECTION
C)
STM-1
AD-TU
B)
DXC-AU
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