PRBS pseudo-random bit sequence
PSP principal states of polarization
PS-PON Power Splitting PON
PTI Payload Type Indicator
QAM Quadrature Amplitude Modulation
QoS quality of service
QPSK Quadrature Phase Shift Keying
RADSL Rate Adaptive DSL
RBOC Regional Bell Operating Company
RF radio frequency
RFP Request for Proposal
RIN relative intensity noise
RMS Root Mean Square
RN remote node
ROSA receive optical subassembly
RSOA reflective semiconductor optical amplifier
RT Remote Terminal
RTD Round Trip Delay
RTT Round Trip Time
Rx receiver
RZ return to zero
SA Source Address
SCB Single Copy Broadcast
SDH Synchronous Digital Hierarchy
SDSL Symmetric DSL
SerDes serializer/deserializer
SFF small-form-factor
SFP+ small-form-factor pluggable plus
SHR Self-healing ring
SLA Service ...