RSS-111 — Broadband Public Safety Equipment Operating in the Band 4940–4990 MHz
Issue 4, January 2012
Spectrum Management and Telecommunications Radio Standards Specification
Radio Standards Specification 111, Issue 4, Broadband Public Safety Equipment Operating in the Band 4940-4990 MHz, replaces RSS-111, Issue 3, dated June 2009.
This document will be in force as of the publication of notice SMSE-001-12 in the Canada Gazette, Part I. Upon publication, the public has 120 days to submit comments. Comments received will be taken into account in the preparation of the next version of the document.
- The power limit used to classify low- and high-power devices has been clarified.
- The determination of equipment compliance using multiple transmitters has been clarified.
Issued under the authority of
the Minister of Industry
Engineering, Planning and Standards Branch
- General Information
- General Certification Requirement
- Measurement Methods
- Transmitter and Receiver Standard Specifications
This Radio Standards Specification (RSS) sets out standards for the certification of transmitters and receivers in the band 4940-4990 MHz for public safety applications.
Equipment operating in this band is classified as Category I. A technical acceptance certificate (TAC), issued by the Certification and Engineering Bureau of Industry Canada, or a certificate issued by a certification body (CB) is required.
The equipment covered by this standard is subject to licensing pursuant to subsection 4(1) of the Radiocommunication Act.
All Spectrum Management and Telecommunications publications are available on Industry Canada’s website at http://www.ic.gc.ca/spectrum, under Official Publications.
In addition to the related documents specified in RSS-Gen, General Requirements and Information for the Certification of Radio Apparatus, the following departmental document should be consulted:
RSS-111 shall be used in conjunction with RSS-Gen for general specifications and information relevant to the equipment for which this standard applies.
In conjunction with the measurement methods described in RSS-Gen, the transmit power and power spectral density specified in this standard shall be measured using conducted emission measurement by direct connection to the equipment under test. If the device cannot be connected directly, alternative methods may be used provided that they are fully described in the test report. In such cases, the Certification and Engineering Bureau of Industry Canada shall be consulted to determine the acceptability of the method.
The transmit power shall be measured in conducted mode, using a peak detector, over a period of continuous transmission of sufficient duration such that the acquired trace is maximized. Video averaging is not allowed.
The transmitter power spectral density shall be measured over a bandwidth of 1 MHz or 99% of the emission bandwidth, whichever is less, with the power measured as per Section 4.1. A resolution bandwidth less than the measurement bandwidth can be used provided that the measured power is integrated to show total power over the measurement bandwidth.
The 0 dB reference level in the unwanted emission mask (see Section 5.4) is the maximum in-band power spectral density measured in terms of average power in the equipment’s channel bandwidth, using a resolution bandwidth of as close as possible to, without being less than 1% of the occupied bandwidth, and a video bandwidth of 30 kHz. The unwanted power spectral density emissions are also measured using the same resolution and video bandwidths used in measuring the reference in-band power spectral density.
Equipment certified under this standard shall use digital modulation.
The applicant shall ensure frequency stability by showing that the occupied bandwidth is maintained within the band of operation when tested at the temperature and supply voltage variations specified for the frequency stability measurement in RSS-Gen.
Equipment is classified as either a low-power or high-power device according to its maximum transmitted power and its channel bandwidth as described in the section below. The equipment’s occupied bandwidth shall not exceed its channel bandwidth. The transmitted power of low-power and high-power devices shall not exceed the maximum limits corresponding to the equipment type given in Table 1.
|Channel Bandwidth (MHz)||Transmitter Power, P (dBm)|
|Low-power Device||High-power Device|
|1||P ≤ 7||7 < P ≤ 20|
|5||P ≤ 14||14 < P ≤ 27|
|10||P ≤ 17||17 < P ≤ 30|
|15||P ≤ 18.8||18.8 < P ≤ 31.8|
|20||P ≤ 20||20 < P ≤ 33|
High- and low-power devices are also limited to a maximum power spectral density of 21 dBm/MHz and 8 dBm/MHz respectively. Devices using channel bandwidths other than those listed in Table 1 are permitted; however, the channel bandwidth shall not exceed 20 MHz and the devices shall comply with the maximum power spectral density limits of 21 dBm/MHz for high-power transmitters and 8 dBm/MHz for low-power transmitters. See SP 4940 MHz for antenna gain limits and operational restrictions for the device.
For equipment with an antenna system that works with multiple transmitters, with different information transmitted by each transmitter to each receiver, the total power of the device shall be calculated as the sum of the powers from all the transmitters and it shall not be higher than the power limit specified in Table 1 for high-power devices according to the equipment’s channel bandwidth.
Transmitter unwanted emissions shall be measured according to the method described in Section 4.3.
On any frequency f, offset from the channel centre frequency fc by a separation fd (expressed as a percentage of the channel bandwidth), the power spectral density of the unwanted emissions for low- and high-power transmitters shall comply with the limits specified in Table 2. Figure 1 shows the emission mask for low- and high-power transmitters. For equipment with multiple transmitters, the unwanted emissions of each transmitter shall comply with the emission limits based on the output power of the transmitter regardless of the total output power of the equipment (i.e. total output power from all the transmitters).
|Offset Frequency fd
(% of the Equipment’s Channel Bandwidth)
|Minimum Attenuation (dB)|
|Low-power Transmitter||High-power Transmitter|
|Where: fd (%) = ((f-fc)/channel bandwidth) x 100
p: transmitter’s output power (in watts), measured as per Section 4.1
|0 <fd ≤ 45||0||0|
|45 < fd ≤ 50||219 log (fd/45)||568 log (fd/45)|
|50 < fd ≤ 55||10 + 242 log (fd/50)||26 + 145 log (fd/50)|
|55 < fd ≤ 100||20 + 31 log (fd/55)||32 + 31 log (fd/55)|
|100 < fd ≤ 150||28 + 68 log (fd/100)||40 + 57 log (fd/100)|
|fd > 150||40||whichever is less stringent 50 or
55 + 10 log p
Receiver spurious emissions shall comply with the limits specified in RSS-Gen.
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