FCC DFS TEST REPORT

FCC ID: UIDW31

Equipment: Wireless Router

Brand Name: ARRIS

Model Name: W31, W30

Applicant: ARRIS
3871 Lakefield Drive Suite 300, Suwanee, Georgia, 30024 United States

Manufacturer: ARRIS
3871 Lakefield Drive Suite 300, Suwanee, Georgia, 30024 United States

Standard: 47 CFR FCC Part 15.407

Test Summary

Note: The zero wait mechanism only switches from non-DFS channel to DFS channel. For the neighbor channel only achieve when the traffic duty cycle less than 1%. Above two conditions are declared by manufacturer.

General Description

Information

RF General Information

Note: EUT employ a TPC mechanism and TPC have the capability to operate at least 6 dB below highest RF output power.

Note: The above information was declared by manufacturer.

Test Configuration of EUT

Test Channel Frequencies Configuration

The Worst Case Measurement Configuration

The EUT shall be configured to operate at the highest transmitter output power setting. If more than one antenna assembly is intended for this power setting, the gain of the antenna assembly with the lowest gain shall be used. The DFS radar test signals have been aligned to the direction corresponding to the EUT's maximum antenna gain.

Note: The Master supports AP Router and Extender, use the Master (AP Router) to performed test only.

Dynamic Frequency Selection (DFS) Test Result

General DFS Information

DFS Parameters

Table D.1: DFS requirement values

Note 1: Channel Move Time and the Channel Closing Transmission Time should be performed with Radar Type 0. The measurement timing begins at the end of the Radar Type 0 burst.

Note 2: The Channel Closing Transmission Time is comprised of 200 milliseconds starting at the beginning of the Channel Move Time plus any additional intermittent control signals required to facilitate Channel changes (an aggregate of 60 milliseconds) during the remainder of the 10 second period. The aggregate duration of control signals will not count quiet periods in between transmissions.

Note 3: During the U-NII Detection Bandwidth detection test, radar type 0 is used and for each frequency step the minimum percentage of detection is 90%. Measurements are performed with no data traffic.

Table D.2: Interference threshold values

Note 1: This is the level at the input of the receiver assuming a 0 dBi receive antenna.

Note 2: Throughout these test procedures an additional 1 dB has been added to the amplitude of the test transmission waveforms to account for variations in measurement equipment. This will ensure that the test signal is at or above the detection threshold level to trigger a DFS response.

Note3: EIRP is based on the highest antenna gain. For MIMO devices refer to KDB Publication 662911D01.

Applicability of DFS Requirements

Applicability of DFS Requirements Prior to Use of a Channel

Applicability of DFS Requirements during Normal Operation

Additional requirements for devices with multiple bandwidth modes

Note: Frequencies selected for statistical performance check (Section 7.8.4) should include several frequencies within the radar detection bandwidth and frequencies near the edge of the radar detection bandwidth. For 802.11 devices it is suggested to select frequencies in each of the bonded 20 MHz channels and the channel center frequency.

User Access Restrictions

DFS controls (hardware or software) related to radar detection are NOT accessible to the user. Manufacturer statement confirming that information regarding the parameters of the detected Radar Waveforms is not available to the end user.

Channel Loading/Data Streaming

• The data file (MPEG-4) has been transmitting in a streaming mode.
• Software to ping the client is permitted to simulate data transfer with random ping intervals.
• Minimum channel loading of approximately 17%.
• Unicast protocol has been used.

Radar Test Waveform Calibration

Short Pulse Radar Test Waveforms

Note 1: Short Pulse Radar Type 0 should be used for the detection bandwidth test, channel move time, and channel closing time tests.

A minimum of 30 unique waveforms are required for each of the short pulse radar types 1 through 4. If more than 30 waveforms are used for short pulse radar types 1 through 4, then each additional waveform must also be unique and not repeated from the previous waveforms. The aggregate is the average of the percentage of successful detections of short pulse radar types 1-4.

Long Pulse Radar Test Waveform

Each waveform is defined as follows:

• The transmission period for the Long Pulse Radar test signal is 12 seconds.
• There are a total of 8 to 20 Bursts in the 12 second period, with the number of Bursts being randomly chosen. This number is Burst Count.
• Each Burst consists of 1 to 3 pulses, with the number of pulses being randomly chosen. Each Burst within the 12 second sequence may have a different number of pulses.
• The pulse width is between 50 and 100 microseconds, with the pulse width being randomly chosen. Each pulse within a Burst will have the same pulse width. Pulses in different Bursts may have different pulse widths.
• Each pulse has a linear FM chirp between 5 and 20 MHz, with the chirp width being randomly chosen. Each pulse within a transmission period will have the same chirp width. The chirp is centered on the pulse. For example, with a radar frequency of 5300 MHz and a 20 MHz chirped signal, the chirp starts at 5290 MHz and ends at 5310 MHz.
• If more than one pulse is present in a Burst, the time between the pulses will be between 1000 and 2000 microseconds, with the time being randomly chosen. If three pulses are present in a Burst, the time between the first and second pulses is chosen independently of the time between the second and third pulses.
• The 12 second transmission period is divided into even intervals. The number of intervals is equal to Burst Count. Each interval is of length (12,000,000 / Burst Count) microseconds. Each interval contains one Burst. The start time for the Burst, relative to the beginning of the interval, is between 1 and [(12,000,000 / Burst Count) - (Total Burst Length) + (One Random PRI Interval)] microseconds, with the start time being randomly chosen. The step interval for the start time is 1 microsecond. The start time for each Burst is chosen independently.

Frequency Hopping Radar Test Waveform

The FCC Type 6 waveform uses a static waveform with 100 bursts in the instruments ARB. In addition, the RF list mode is operated with a list containing 100 frequencies from a randomly generated list and it had be ensured that at least one of the random frequencies falls into the UNII Detection Bandwidth of the DUT. Each burst from the waveform file initiates a trigger pulse at the beginning that switches the RF list from one item to the next one.

DFS Threshold Level

The Interference Radar Detection Threshold Level is is -64 dBm + 0 [dBi] + 1 dB = -63 dBm. That had been been taken into account the output power range and antenna gain.

Calibration Setup

Master Radiated Calibration Setup

A diagram shows a typical radiated calibration setup with a Radar Signal Generator, Spectrum Analyzer, and the Equipment Under Test (EUT) placed 3 meters apart.

Test Equipment and Calibration Data

Note: Calibration Interval of instruments listed above is one year.

Measurement Uncertainty