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4.1 Channeling arrangements
Up one level
There are a number of arrangements in common use. The US has adopted a plan based on the use of the total spectrum available in 8 x 1.25 GHz channels. Emissions are not restricted to individual channels and a number of adjacent channels can be amalgamated to support relatively wide emissions up to 5GHz in bandwidth.
4.1.1 US Channeling arrangements in GHz
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70 GHz Band |
80 GHz Band |
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71.00-72.25
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81.00-82.25
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72.25-73.50
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82.25-83.50
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73.50-74.75
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83.50-84.75
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74.75-76.00
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84.75-86.00
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4.1.2 ECC Channeling arrangements
The ERO has drafted a standard for these frequency bands12 and stipulated this in Recommendation ECC/REC (05) 07. It consists of a plan where each 5 GHz block has a guard band of 125 MHz at each end and contains 19 x 250 MHz channels.
Of the 47 members of the ERO only five have indicated that they have adopted this standard. These are Croatia, Denmark, Estonia, Netherlands and Slovenia.
The rest of Europe appears to have adopted variations on the ECC Recommendation.
4.1.3 Australia and UK channeling arrangements
Both the UK13 and Australia 14 have decided that detailed channeling of the band is unnecessary and in fact may be counterproductive as the modulation schemes are not regulated. In the UK and Australia, a guard band of 125 MHz is provided at each end of the bands giving an available bandwidth of 4.75 GHz. This is in accordance with the ECC recommendation ECC/REC (05) 07.
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70 GHz Band
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80 GHz Band
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71.000 -71.125 Guard Band
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81.000-81,125 Guard Band
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71.125-75.875
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81.125-85.875
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75.875-76.000 Guard Band
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85.875-86.000 Guard Band
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4.1.4 The case for a guard band
Europe and Australia have opted for a 125 MHz guard band at each band edge. The USA has not adopted any guard bands.
Immediately adjacent to these bands are a number of evolving spectrum uses like vehicle collision avoidance radar and the Road Transport and Traffic Telematics (RTTT). The timing of development of some of the applications in the adjacent bands is some way in the future.
It is expected that the uptake of high capacity point to point links in New Zealand will reflect trends in other similar countries and in the future there may be many such links in service. The introduction of guard bands from the outset minimises the potential for interference caused by unwanted emissions from the fixed service and from the services in the bands immediately adjacent.
Footnotes
12The document can be found on the ERO Website at www.ero.dk
13See OFCOM Document OfW 369 March 2007 see www.ofcom.org.uk
14See ACMA RALI FX 20 of 13 December 2007 see www.acma.gov.au
