| ·BLT： | Beacon Loop Timer |
| ·BRs： | Signaling Baud Rate for continuous transmission on the medium |
| ·BTs： | Nominal signaling Baud width |
| ·dV： | Voltage tolerance |
| ·Dt： | Distortion |
| ·Dt+tJ： | Total Distortion and Jitter |
| ·FL： | Fiber Length |
| ·FORX： | Fiber Optic Receiver |
| ·FOTX： | Fiber Optic Transmitter |
| ·FWHM： | Full Width at Half Maximum |
| ·HSRB： | High Speed Ring Bus |
| ·ISI： | Inter-Symbol Interference |
| ·Jt： | Jitter |
| ·LTC： | Loop Timer Counter |
| ·NRZI： | Nonreturn to Zero Invert |
| ·OS： | Optical Signal Overshoot |
| ·OSR： | FORX Optical Signal Range |
| ·Prx： | Receiver input Port |
| ·Ptx： | Transmitter output Port |
| ·PW： | Pulse Width |
| ·RPIabmx： | FORX absolute maximum Radiant Power Input |
| ·RPIma
x： | FORX maximum Radiant Power Input |
| ·RPImi
n： | FORX minimum Radiant Power Input |
| ·RPOon： | FOTX Radiant Power Output on |
| ·RPOoff： | FOTX Radiant Power Output (off/steady state low) |
| ·Rse： | FOTX static extinction Ratio |
| ·SBW： | Spectral Bandwidth |
| ·Tacq： | FORX acquisition time |
| ·Tmin： | Minimum Temperature |
| ·Tmax： | Maximum Temperature |
| ·Tof： | Optical falltime |
| ·Tor： | Optical risetime |
| ·US： | Optical Signal Undershoot |
| ·WCP： | Worst-Case test Pattern |
| ·WO： | Wavelength of peak radiance |