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19
SM - Single Mode
SNCP - Sub network Connection Protection
SOH - Section Overhead
SPRING - Shared Protection Ring
SSM - Synchronous State Message
STM-N - Synchronous Transport Module Level-N
TCP - Transport Control Protocol
TDEV - Time Deviation
TDM - Time Division Multiplex
TM - Terminal Multiplexer
TMN - Telecommunications Management Network
TU - Tributary Unit
TU-m - Tributary Unit,level m
TUG-m - Tributary Unit Group,level m
UAS - Unavailable Second
VC - Virtual Container
VCG - Virtual Container Group
VC-n - Virtual Container,level n
VLAN - Virtual Local Area Network
WAN - Wide Area Network
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