On a Citroën DS3, the horn is typically located behind the front grille, near the front of the vehicle. It can usually be accessed by removing the grille or by reaching through the engine bay, depending on the specific model and year. If you need to replace or repair the horn, it's advisable to consult the vehicle's manual for detailed instructions.
I think it's only to increase the sound of the horn to be able to here it in the loud traffic noise also.
To replace the horn on a Citroën DS3, first, disconnect the vehicle's battery to ensure safety. Remove the front grille or access panel to locate the horn, which is usually mounted near the front of the vehicle. Disconnect the electrical connector and unbolt the horn from its bracket, then install the new horn by reversing the process—mounting it securely and reconnecting the electrical connector. Finally, reconnect the battery and test the new horn to ensure it functions properly.
DS3 is 44.7 Mbps and a T1 is 1.55 Mbps. So 1 DS3 = 28 T1s http://www.dslbroker.com/ds3.html
A DS3 has 28 T1's http://techblog.intelletrace.com/what-is-a-ds3-hub/
3 ds3 in stm1
A DS3 can do 45Mbps Bidirectional Simultaneously.
how many DS3's are in an OC192
an OC48 has 48 DS3's.
672 DS0 make 1 DS3
T3 is the same as DS3. DS3 is a 45Mbps Data Circuit
T3 is the same as DS3. DS3 is a 45Mbps Data Circuit
A DS3 can do 45Mbps Bidirectional Simultaneously. That is 5.63 MBps