Acterna ANT-5 - Page 170

Appendix G – Glossary
Page 170 Acterna ANT-5
SELV Safety Extra Low Voltage
SEP Severely Errored Period
SES, SESR Severely Errored Second, Severely Errored Secs Ratio
SHR, BSHR Self-Healing Ring, Bi-directional Self-Healing Ring
SMN, SMS SDH management network, SDH management sub-network
SOH Section Overhead
SPE Synchronous Payload Envelope
SPRING Shared Protection Ring
STM, STM-N Synchronous Transport Module; Level N = 0, 1, 4, 16, 64
STS, STS-N Synchronous Transport Signal; Level N = 1, 3
TIM Trace Identifier Mismatch
TOH Transport Overhead
TMN Telecommunications Management Network
TSE Test Sequence Error
TU, TU-m Tributary Unit; Level m = 1, 2, 3
TUG-m Tributary Unit Group; Level m = 1, 2
UAS, UAT Unavailable Second, Unavailable Time
UI Unit Interval
UNEQ Unequipped
UNI User Network Interface
µs Microseconds
V5 POH byte (VC-1, 2)
VBR Variable Bit Rate
VC, VC-n Virtual Channel, Virtual Container; Level n = 1, 2, 3, 4
VC-n-Xc Concatenated virtual container, level n, X concatenated VCs
VCI Virtual Channel Identifier