PTP 670 5150-5250 MHz Support for Canada?

Does the PTP 670 support operation in the 5150-5250 MHz band, up to the limits here http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf11294.html? If not, will support be coming soon?

Hi Jeff,

PTP 670 supports operation in the 5150 MHz to 5250 MHz band in Canada using the existing Regulatory Band 84. This is also used for FCC U-NII-1. You might have to regenerate the License Key for your units at https://support.cambiumnetworks.com/licensekeys/ptp50670 to add RB 84.

IC (like FCC) specifies very low levels of out of band emissions for this band. To comply with these requirements, we have to restrict the maximum transmitted power. This means that the power we can offer in this band is less than the conducted power limit in the standard. There are no plans to change the limits at present.

I hope this makes sense. If not, come back to me.

Mark

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Thanks, Mark. What is the TX power limit?

Hi Jeff,

The power limits for this band are:

- 5 MHz: 33 dBm EIRP

- 10 MHz: 31 dBm EIRP

- 15 MHz: 37 dBm EIRP

- 20 MHz: 36 dBm EIRP

- 30 MHz: 35 dBm EIRP

- 40 MHz: 30 dBm EIRP

- 45 MHz: 30 dBm EIRP

In addition, the power in the lower edge channels is backed off as follows:

- 5 MHz: 7 dB 5156 MHz to 5158 MHz, 3 dB 5158 MHz to 5200 MHz

- 10 MHz: 8 dB 5158 MHz to 5164 MHz

- 15 MHz: 14 dB 5161 MHz to 5170 MHz, 6 dB 5170 MHz to 5180 MHz

- 20 MHz: 13 dB 5162 MHz to 5175 MHz, 6 dB 5175 MHz to 5187 MHz

- 30 MHz: 11 dB 5168 MHz to 5187 MHz, 5 dB 5187 MHz to 5200 MHz

- 40 MHz: 6 dB 5172 MHz to 5200 MHz

- 45 MHz: 7 dB 5176 MHz to 5205 MHz

As you will see, the channels at the lower band edge are not attractive for longer range links.

Mark

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Thanks again.

I’m a bit confused by this, according to the regulation, PtP systems can have a maximum EIRP of 53 in Canada, not 36, can you comment?

That's right that the maximum power in the regulations is 53 dBm EIRP. However, IC (like FCC) additionally specifies very low levels of out of band emissions for this band. To comply with these requirements, we have to restrict the maximum transmitted power. This means that the power we can offer in this band is less than the conducted power limit in the standard. The same limitations will almost certainly apply to competitors' products.

Sorry I'm still a little confused though. I have a PTP450i, and if I set it to 5.1 GHz, the radios max transmit tower is 27 dBm.

I also have a PTP670, and in the 5.1GHz band it shows the max EIRP as 41 (transmit power of 18 dBm)

Is this a regulatory error on the radios, or something else?

I guess looking at the PTP670 more closely, though the "max transmit power" is listed at 18 dBm, it never goes higher than 13 dBm (36 dBm EIRP), so I guess that is what you are referring to as the max?

It's still a bit confusing because LinkPlanner shows the max as 30 dBm

I see how this could be confusing! I will look into this power limit for you and report back. I'll need to talk to colleagues from the PMP 450 team. I'm aiming to have an answer by Monday.

Mark

I'll summarise what we have for Canada 5.1 GHz and FCC U-NII-1.

Limits for PTP 670 with integrated antenna

The maximum power allowed for PTP 670 with an integrated antenna is as follows:

- 5 MHz: 33 dBm EIRP

- 10 MHz: 31 dBm EIRP

- 15 MHz: 37 dBm EIRP

- 20 MHz: 36 dBm EIRP

- 30 MHz: 35 dBm EIRP

- 40 MHz: 30 dBm EIRP

- 45 MHz: 30 dBm EIRP

In addition, the power in the lower edge channels is backed off as follows:

- 5 MHz: 7 dB 5156 MHz to 5158 MHz, 3 dB 5158 MHz to 5200 MHz

- 10 MHz: 8 dB 5158 MHz to 5164 MHz

- 15 MHz: 14 dB 5161 MHz to 5170 MHz, 6 dB 5170 MHz to 5180 MHz

- 20 MHz: 13 dB 5162 MHz to 5175 MHz, 6 dB 5175 MHz to 5187 MHz

- 30 MHz: 11 dB 5168 MHz to 5187 MHz, 5 dB 5187 MHz to 5200 MHz

- 40 MHz: 6 dB 5172 MHz to 5200 MHz

- 45 MHz: 7 dB 5176 MHz to 5205 MHz

Power in the upper edge channels is not backed off. If you are seeing maximum EIRP of 36 dBm, this probably indicates that channel bandwidth is configured for 20 MHz. The maximum power is different for other bandwidths.

Limits for PTP 670 with exteral parabolic antenna

Out of band emissions are somewhat lower in the configuration with a parabolic antenna, and the maximum EIRP can be increased as follows:

- 5 MHz: 46 dBm EIRP

- 10 MHz: 46 dBm EIRP

- 15 MHz: 46 dBm EIRP

- 20 MHz: 47 dBm EIRP

- 30 MHz: 47 dBm EIRP

- 40 MHz: 41 dBm EIRP

- 45 MHz: 39 dBm EIRP

The lower edge channels are backed off with a parabolic antenna, similar to the integrated example.

If you saw 41 dBm as the maximum EIRP, could this be 40 MHz with an external parabolic antenna.

LINKPlanner

As far as I can tell, LINKPlanner correctly applies the limits above.

PTP 450i in LINKPlanner

Maximum EIRP for PTP 450i with integrated antenna, as reported in LINKPlanner, is as follows:

- 5 MHz: 25 dBm EIRP

- 10 MHz: 28 dBm EIRP

- 15 MHz: 30 dBm EIRP

- 20 MHz: 30 dBm EIRP

- 30 MHz: 30 dBm EIRP

- 40 MHz: 30 dBm EIRP

This is lower than for PTP 670.

Thanks, Mark

There are now multiple topics on the same subject. Let's continue this discussion here: Canada 5.1 GHz band error