key issues to consider when switching to digital february 2010 l.
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Key issues to consider when switching to digital February 2010. Going digital – 12.5 kHz DMR or 6.25 kHz FDMA? . Two of the most important reasons that LMR users go digital are to add voice capacity and to more easily add data applications

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going digital 12 5 khz dmr or 6 25 khz fdma

Going digital – 12.5 kHz DMR or 6.25 kHz FDMA?

Two of the most important reasons that LMR users go digital are to add voice capacity and to more easily add data applications

This presentation sets out the important issues for the user to think about

adding capacity 12 5 khz dmr or 6 25 khz fdma

Adding capacity – 12.5 kHz DMR or 6.25 kHz FDMA?

Adding data applications nearly always means that more capacity is needed to ensure:

Existing voice quality of service is to be maintained and

The new application is to work well

There are real differences between DMR and 6.25 kHz FDMA when it comes to increasing capacity in terms of:

FCC licensing implications

Infrastructure requirements

digital migration in existing fcc 12 5 khz licences dmr

Digital migration in existing FCC 12.5 kHz licences - DMR

Analogue to digital migration with DMR

Existing analogue talk paths in a 12.5 kHz license

New digital talk paths in your 12.5 kHz license

Double capacity in current license?

digital migration in existing fcc 12 5 khz licences fdma

Digital migration in existing FCC 12.5 kHz licences - FDMA

Analogue to digital migration with 6.25 kHz FDMA

Existing analogue 12.5 kHz

license

New digital talk paths

In 12.5 kHz license

Double capacity in current

license?

spectrum efficiency dmr and 6 25 khz fdma

Spectrum efficiency - DMR and 6.25 kHz FDMA

6.25 kHz FDMA Migration

DMR Migration

Existing analogue 12.5 kHz

licence

New digital channels

6.25 kHz spectrum efficient?

New channels fit legacy devices?

No risk of new interference issues?

going digital dmr and 6 25 khz fdma licence summary

Going digital DMR and 6.25 kHz FDMA licence summary

Going digital with DMR means:

Doubling capacity in existing licenses

Keeping existing spectrum

No new frequency co-ordination requirements

Being able to continue to use legacy analogue radios in your spectrum

No new risk of interference as the channel characteristics stay the same and proven 12.5 kHz signals are maintained

use of infrastructure dmr compared to 6 25 khz fdma

Use of infrastructure: DMR compared to 6.25 kHz FDMA

Migrating from one

channel DMR to two

channel DMR:

No extra complexity

No extra cost

Power efficient

No extra space

No new site issues

No extra maintenance

One channel DMR

Two channels DMR

use of infrastructure dmr compared to 6 25 khz fdma9

Use of infrastructure: DMR compared to 6.25 kHz FDMA

Migrating from one channel FDMA to two channel FDMA:

Extra complexity

Extra cost

Greater power use

More space

Potential site issues

Extra maintenance

One channel 6.25 kHz FDMA

Two channels 6.25 kHz FDMA

summary

Summary

When you go digital:

Understand the real differences in the technology that is on offer

Understand the license implications

Understand the infrastructure requirements today and tomorrow

Make the smart choice