Appendix G – Glossary
Acterna ANT-5 Page 169
OC-N Optical Carrier; N = 1, 3, 12, 48, 192
OH Overhead
OOF Out-Of-Frame
OOS Out-Of-Service
PCR Peak Cell Rate
PDH Plesiochronous Digital Hierarchy
PDU Protocol Data Unit
PLL Phase-Locked Loop
PLM Payload Label Mismatch
PMP Protected Monitor Point
POH Path Overhead
PRBS Pseudo-Random Binary Sequence
PRC Primary Reference Clock
PMP Protected Monitor Point
PPP Point to Point Protocol
QoS Quality of Service
RDI, REI Remote Defect Indicator, Remote Error Indicator
ROSE Remote Operations Service Element
RSOH Regenerator Section Overhead
S1 Synchronisation status byte (MSOH)
SAR Segmentation and Reassembly
SDH Synchronous Digital Hierarchy
SCR Sustainable Cell Rate
SDU Service Data Unit
SEC SDH Equipment Clock
SEFS Severely Errored Framed Seconds
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