G series Hear it!

G series Telecom Definition
The ITU-T Recommendations addressing transmission systems and media, digital systems and networks. See Table G-1 for selected G-series Recommendations. For a full listing of ITU-T Recommendations, see the contact information in Appendix A.
Table G-1: G-Series Recommendations
RecommendationDescription
G.168Digital network echo cancellers
G.169Automatic level control devices
G.651Characteristics of a 50/125 µm multimode graded index optical fibre cable
G.652Characteristics of a single-mode optical fibre and cable
G.653Characteristics of a dispersion-shifted single-mode optical fibre and cable
G.654Characteristics of a cut-off shifted single-mode optical fibre and cable
G.655Characteristics of a non-zero dispersion-shifted single-mode optical fibre and cable
G.665Generic characteristics of Raman amplifiers and Raman amplified subsystems
G.694.1Spectral grids for WDM applications: DWDM frequency grid
G.694.2Spectral grids for WDM applications: CWDM wavelength grid
G.702Digital hierarchy bit rates
G.703Physical/electrical characteristics of hierarchical digital interfaces
G.704Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44,736 kbit/s hierarchical levels
G.705Characteristics of PDH equipment functional blocks
G.711Pulse code modulation (PCM) of voice frequencies
G.7227 kHz audio-coding within 64 kbit/s
G.722.1Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss
G.722.2Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB)
G.723.1Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s
G.72640, 32, 24, 16 kbit/s ADPCM
G.7275-, 4-, 3-, and 2-bit/sample embedded ADPCM
G.728Coding of speech at 16 kbit/s using LD-CELP
G.729Coding of speech at 8 kbit/s using CS-CELP
G.729.1G.729 based Embedded Variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729
G.983.1Broadband optical access systems based on Passive Optical Networks (PON)
G.991.1High bit rate Digital Subscriber Line (HDSL) transceivers
G.991.2Single-pair high-speed digital subscriber line (SHDSL) transceivers
G.992.1Asymmetric digital subscriber line (ADSL) transceivers
G.992.2Splitterless asymmetric digital subscriber line (ADSL) transceivers
G.992.3Asymmetric digital subscriber line transceivers 2 (ADSL2)
G.992.4Splitterless asymmetric digital subscriber line transceivers 2 (splitterless ADSL2)
G.992.5Asymmetric Digital Subscriber Line (ADSL) transceivers - Extended bandwidth ADSL2 (ADSL2+)
G.993.1Very high speed digital subscriber line transceivers
G.993.2Very high speed digital subscriber line transceivers 2 (VDSL2)

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