Total Access Communication System
| Mobile communication standards |
| GSM / UMTS (3GPP) Family |
| GSM (2G) |
| UMTS (3G) |
| 3GPP Rel. 8 (Pre-4G) |
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| cdmaOne / CDMA2000 (3GPP2) Family |
| cdmaOne (2G) |
| CDMA2000 (3G) |
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| AMPS Family |
AMPS (1G)
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| D-AMPS (2G) |
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| Other Technologies |
| Pre Cellular |
| 1G |
| 2G |
| Pre-4G |
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| Channel Access Methods |
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| Frequency bands |
Total Access Communication System (TACS) and ETACS are mostly-obsolete variants of AMPS which were used in some European countries (including the UK & Ireland in 1983). TACS was also used in Japan under the name Japanese Total Access Communication (JTAC).[1][1][2][2] It was also used in Hong Kong [3]. ETACS was an extended version of TACS with more channels.
TACS and ETACS are now obsolete in Europe, having been replaced by the GSM system. In the United Kingdom, the last ETACS service operated by Vodafone was discontinued on 31 May 2001, after sixteen years of service. ETACS is however still in use in a handful of countries elsewhere in the world. NMT is another analog cellular standard that was widely used in Europe, mainly in the Nordic countries, which has now been fully replaced by GSM except for limited use in rural areas due to its superior range.
Frequency bands used by ETACS in the UK
| Channel | Cell TX (MHz) | Mobile TX (MHz) | Notes .............. |
|---|---|---|---|
| 1 | 935.0125 | 890.0125 | 25 kHz spaced channels |
| 23 | 935.5625 | 890.5625 | 1st of 21 dedicated vodafone control channels |
| 24 | 935.5650 | 890.5650 | 2nd of 21 dedicated vodafone control channels |
| 300 | 942.4875 | 898.0625 | 9.5 kHz peak speech fm deviation |
| 323 | 943.0625 | 898.0625 | 1st of 21 dedicated cellnet control channels |
| 600 | 949.9875 | 904.9875 | last TACS channel, ETACS extended this to 1320 later |
| 0 | |||
UK ETACS and USA AMPS compared
| Feature | TACS | AMPS | Notes .............. |
|---|---|---|---|
| Channel Spacing | 25 kHz | 30 kHz | |
| Speech peak Freq Dev | 9.5 kHz | 12 kHz | |
| Signalling FSK peak Freq Dev | 6.4 kHz | 8 kHz | |
| Signalling rate | 8 kbit/s | 10 kbit/s | |
| SAT 0 | 5970 Hz | 5970 Hz | |
| SAT 1 | 6000 Hz | 6000 Hz | |
| SAT 2 | 6030 Hz | 6030 Hz | |
| ST | 8000 Hz | ||
| Mobile TX pwr MAC 0 | 2.82 W | ||
| Mobile TX pwr MAC 1 | 1.12 W | ||
| Mobile TX pwr MAC 2 | 447 mW | ||
| Mobile TX pwr MAC 3 | 178 mW | ||
| Mobile TX pwr MAC 4 | 70.8 mW | ||
| Mobile TX pwr MAC 5 | 28.2 mW | ||
| Mobile TX pwr MAC 6 | 11.2 mW | ||
| Mobile TX pwr MAC 7 | 4.5 mW |
References
- ^ a b GSM Terma, volny.cz. Article retrieved 2006-01-19.
- ^ a b Japanese Total Access Communication (JTAC), mobiledia.com. Article retrieved 2007-01-19.
- ^ Cellular Networks QuickStart: Getting up to Speed on Cellular, from 1G to 3G, devx.com. Article dated 2003-03-17, retrieved 2007-01-19.
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