Glossary
TCH/FS (A full rate Speech TCH) in 3GPP: meaning and where it is specified
At a glance
- Term
- TCH/FS
- Stands for
- A full rate Speech TCH
- Defined in
- 3GPP TR 21.905 V19.2.0, clause 4
- Used in
- TS 45.001, TS 45.002, TS 45.003
In plain words
TCH/FS means a full rate Speech TCH, identifying a full-rate speech traffic channel. TS 45.001 lists it among its set of channels, while TS 45.002 names it as a full rate traffic channel for speech. Informative Annex A of TS 45.003 summarizes TCH/FS as "full rate speech traffic channel".
Source: 3GPP TS 45.003 V18.0.0, clause A. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/45_series/45.003/45003-i00.zip
Sources
- 3GPP TR 21.905 V19.2.0, clause 4. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/21_series/21.905/21905-j20.zip
- 3GPP TS 45.003 V18.0.0, clause A. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/45_series/45.003/45003-i00.zip
- 3GPP TS 45.001 V18.0.0, clause 2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/45_series/45.001/45001-i00.zip
- 3GPP TS 45.002 V19.0.0, clause 3.2.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/45_series/45.002/45002-j00.zip
How this page was made
The facts box comes straight from the 3GPP TDoc list and specification archive as indexed by 3GPP Scout. An AI model (GPT-6 Luna) wrote the paragraph and named the source of each sentence. Code checked every quote word for word against the stored source text and every number against the cited source. A second AI model from another company (Claude Opus 5.5) reviewed the paragraph against the same sources. The 3GPP documents themselves govern.