ETSI - EN 301 785
Fixed Radio Systems; Point-To-Point Equipment; Parameters for Packet Data Radio Systems for Transmission of Digital Signals Operating in the Frequency Range 23, 26, 28 or 38 GHz
|Publication Date:||1 April 2001|
The present document specifies the minimum performance parameters for terrestrial fixed packet data service radio communications equipments operating at 23, 26, 28, or 38 GHz. Such digital systems are intended to be used for point-to-point connections in local and regional networks at data rates of 10 Mbit/s and 100 Mbit/s and operate in full-duplex mode.
The parameters to be specified fall into two categories:
a) those that are required to provide compatibility between channels from different sources of equipment on the same route, connected either:
- to separate antennas; or
- to separate polarizations of the same antenna;
b) parameters defining the transmission quality of the proposed system.
The present document deals with Radio Frequency (RF) and baseband characteristics relevant to packet data networking equipment. Antenna/feeder system requirements are covered in EN 300 833 .
The present document does not focus on aspects related to test procedures and test conditions, however they are to be found in EN 301 126-1 , IEEE 1802.3 , and IEEE 1802.3d .
As the maximum transmission rate in a given bandwidth depends on system spectral efficiency, different equipment classes are defined:
Class 2: equipment spectral efficiency based on typically 4-states modulation scheme (e.g. 4-FSK, 4-QAM, or equivalent);
Class 4: equipment spectral efficiency based on typically 16 or 32-states modulation scheme (e.g. 16-QAM, 32-QAM, or equivalent);
Class 5: equipment spectral efficiency based on typically 64 or 128-states modulation scheme (e.g. 64-QAM, 128-QAM, or equivalent).
The above classes are indicative only and do not imply any constraint to the actual modulation format, provided that all the requirements in the present document are met.
Safety aspects are outside the mandate of ETSI and they will not be considered in the present document. However compliance to EN 60950  will be required to comply with 1999/5/EC  Directive (R&TTE).
Technical background for most of the parameters and requirements referred in the present document may be found in TR 101 036-1  and IEEE 802.3 .
The present document does not address SDH/PDH radio requirements, therefore equipment with SDH/PDH interfaces should meet the requirements of the appropriate SDH/PDH radio specifications.