Foreign Exchange Office (FXO) refers to the connection to the ana-
logue terminal. See also FXS.
Foreign Exchange Station (FXS) refers to the analogue connection
to the connection socket or PBX. See also FXO.
G.711 is an audio codec. Audio signals from the frequency range
between 300 Hz and 3400 Hz are passed with a sampling rate of 8
kHz. At a data transmission rate of 64 kbit/s, the codec achieves ex-
cellent voice quality (MOS value: 4.4). The A-law quantisation meth-
od is used in Europe, and the µ-law method in the USA.
G.722 is an audio codec. Audio signals from the frequency range
between 50 Hz and 7000 Hz are passed with a sampling rate of 16
kHz. At a data transmission rate of 64 kbit/s, the codec achieves
outstanding voice quality (MOS value: 4.5).
G.726 is an audio codec. Audio signals from the frequency range
between 200 Hz and 3400 Hz are passed with a sampling rate of 8
kHz. The codec achieves an acceptable voice quality. MOS value:
3.7 (16 kbit/s), 3.8 (24 kbit/s), 3.9 (32 kbit/s), 4.2 (40 kbit/s). There
are two different coding methods: I.366 and X.420
G.729 is an audio codec. Audio signals from the frequency range
between 300 Hz and 2400 Hz are passed with a sampling rate of 16
kHz. At a data transmission rate of 8 kbit/s, the codec achieves an
acceptable voice quality (MOS value: 3.9).
Data transmission recommendation for HDSL.
Data transmission recommendation for SHDSL.
Data transmission recommendation for ADSL. There are two coun-
try-specific versions: G.992.1 Annex A and G.992.1 Annex B. Data
transfer rates: 12 Mbit/s (downstream), 1.3 Mbit/s (upstream)
Data transmission recommendation for ADSL (G.LITE / ADSL-Lite).
There are two versions: G.992.2 Annex A and G.992.2 Annex B.
Data transfer rates: 12 Mbit/s (downstream), 1.3 Mbit/s (upstream)
Data transmission recommendation for xDSL2. There are three vari-
ants: G.992.3 Annex A/B (G.DMT to ADSL2) with data transmission
rates of 12 Mbit/s in the downstream and 1.0 Mbit/s in the upstream,
G.992.3 Annex L (RE-ADSL2) with data transmission rates of 5
Mbit/s in the downstream and 0.8 Mbit/s in the upstream and
G.992.3 Annex M (ADSL2) with data transmission rates of 12 Mbit/s
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Glossary
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