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New Member

Permitted 5 Ghz frequency bands in the UK

I wonder if anyone could assist me with my question.

I have been researching the use of the two unlicensed spectrums in the UK. These are 2.4 and 5 GHz.

Within the 5 GHz spectrum there are 3 bands, the lower two, (A,B) have been designated licence exempt.

The two bands are:

Freq Range Service Max EIRP Addit. req's

A: 5150-5350 Mhz mobile, indoor only 200 mW DFS, TPC

B: 5470-5725 Mhz Mobile, outdoor 1W DFS, TPC

Having taken a look at the Aironet 1200 AP Datasheets and the frequencies for 5 Ghz ( 5.15 to 5.35 GHz (FCC UNII 1 and UNII 2) I can see that only band A is supported. Band A has been specified for indoor use.

Is there any planned support for the 5470-5725 mhz band?

Also, do the Aironet's support Dynamic Frequency selection (DFS) which will be a requirement in the UK in areas of dense spectrum usage.

Does anyone know of any 802.11a implementations in the UK? How did they get around this issue.

Many thanks for any assistance anyone may be able to offer.

Steve Freke

1 REPLY
New Member

Re: Permitted 5 Ghz frequency bands in the UK

I have answered each of your questions seperately,

1.I have been researching the use of the two unlicensed spectrums in the UK.

These are 2.4 and 5 GHz.

Within the 5 GHz spectrum there are 3 bands, the lower two, (A,B) have been

designated licence exempt.

The two bands are:

Freq Range Service Max EIRP

Addit. req's

A: 5150-5350 Mhz mobile, indoor only 200 mW DFS,

TPC

B: 5470-5725 Mhz Mobile, outdoor 1W

DFS, TPC

(Reply)

UK has implemented interim regulations that allow products without

DFS (such as 802.11a) to use the band 5150 to 5350 MHz. The power level

for these systems is 120 mW EIRP if TPC is implemented; otherwise it is

only 60 mW. The Cisco 802.11a products have been notified in the UK and

are now being placed on the UK market.

The UK interim regulations are covered by the Interface Requirement

IR2006 (Attached). You will notice that the date for this IR is October

2002. However, it was only recently (Jan 2003) that the spectrum became

license free.

++++

2.Having taken a look at the Aironet 1200 AP Datasheets and the

frequencies for 5 Ghz ( 5.15 to 5.35 GHz (FCC UNII 1 and UNII 2) I can

see that only band A is supported. Band A has been specified for indoor

use.

(Reply)

Yes, that is the present situation.

++++

3.Is there any planned support for the 5470-5725 mhz band?

(Reply)

Yes. The details of the DFS requirements for the B band are incomplete.

These are being worked on by the ETSI BRAN committee as

part of a 5GHz Harmonized Standard. It may turn out that it is not

possible to complete this standard until after the 2003 World Radio

Conference (WRC) to be held in Geneva throughout June. The good news

part of this delay is that it arises because there is an excellent chance we

will get a worldwide co-primary allocation of the A and B 5GHz bands for

Radio LANs at this WRC. Given normal voting and ratification delays, we

expect the Harmonized Standard to be available no later than 1QCY04.

++++

4.Also, do the Aironet's support Dynamic Frequency selection (DFS) which

will be a requirement in the UK in areas of dense spectrum usage.

(Reply)

DFS will be required in the UK to access the full spectrum

(455 MHz = A + B Bands = 19 channels). The Aironet 5GHz

products do not currently support DFS because the standard for it is not

completed. Cisco engineers are very active in this standards work

and Cisco products will include DFS as soon as possible after

the standard is finalized.

++++

5.Does anyone know of any 802.11a implementations in the UK? How did they

get around this issue.

(Reply)

As noted above, interim regulations that were implemented last

October allow sale and use of products without DFS capability in the band

5150 to 5350 MHz. At that time a license was still required, but that

has changed as of end of Jan 2003. There is no need anymore for a

license and you will soon be able to buy Cisco 5GHz products in the UK.

++++

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