Exemption Reason of FCC DFS Review

FCC ID: RSL-TQ4400E

Cover Letter(s)

Download: PDF

FCCID_3397753

Revision History
Revision Date Originator Description
1.0 2017/02/09 Ape Hou First release

``

Index
Chapter 1. Purpose.......................................................................................................................... 4
Chapter 2. Modification in TQ4400e‘s new firmware ..................................................................... 5
Appendix: Antenna/cable Specification ................................................................................................. 8

``

Chapter 1. Purpose
The DFS sample of TQ4400e (FCC ID: RSL-TQ4400E) has been tested on Sep. 13, 2016 in US FCCs Lab.
Allied Telesis’s customers have a new request for the support of bigger gain antenna (10/16/19dBi).
New firmware includes new TX power settings and GUIs for the support of new optional antenna
(10/16/19dBi). Allied Telesis K.K. declares that TQ4400e’s (FCC ID: RSL-TQ4400E) new firmware
does not change any DFS algorithm and behavior (Please refer to Chapter 2 to see the detail). Hope
TQ4400e (FCC ID: RSL-TQ4400E) can exempt from sample request for certified equipment for
FCC inspection.

There are two main reasons:
1. New firmware does not replace default antenna (gain: 7dBi).
According to previous DFS test experience, Test Lab (BV-ADT) chooses minimal gain antenna
(default antenna, gain: 7dBi) to do the DFS test. Hence, we think FCC does not need to test the
same sample with same DFS function of TQ4400e (FCC ID: RSL-TQ4400E) twice.

2. New firmware does not change any DFS algorithm and behavior. (Please refer to Figure 1)
New firmware only changes the following two items which are related to 10/16/19dBi optional
antenna.
- Add “Antenna Model Selection” in Web-GUI
- Add TX power setting for optional antennas (10/16/19dBi).
No Change function New Add function

Radar Signal (Raw data) GUI
Default antenna

GUI
GUI
Optional antenna
1
DFS detect radar
signal algorithm
Wireless Applications User Space

Broadcom BCM43460 wireless driver Kernel space

802.11 protocol stack 2 Add TX Power for
10/16/19 dBi
Tx Power optional antenna
Hardware
Device Default Optional antenna
Arch DFS
Driver antenna (7 dBi) (10/16/19 dBi)
Driver
Tx Power Tx Power

Set Wireless IC TX Power
Hardware Abstraction Layer

Broadcom BCM53016 ARM Platform Hardware Platform

TQ4400e

Figure 1 Feature difference between the firmware

``

Chapter 2. Modification in TQ4400e‘s new firmware

Table 1 Firmware difference
Item Old Firmware (Default antenna) New Firmware (Optional antenna)
FCC ID RSL-TQ4400E Same as left side list.
Differences in Chipset BCM53016 x 1 Same as left side list.
BCM43460 x 2
Differences in DFS Tested on Sep. 13, 2016 in US FCC DFS function is same as left side list.
functioning, circuitry, Lab.
software, etc.
Antenna information and Default antenna (Minimum gain): Default antenna (Minimum gain):
differences for the 5dBi antenna (2.4G) Same as left side list.
minimum gain antennas 7dBi antenna (5G)
------------------------ -----------------------
Optional antenna: Optional antenna:
None Support below three new antennas

Ant enna Ant enna gain
AT-AN2458-10DP (2.4G/5G) 8 dBi/10 dBi
AT-AN5158-16DP (5G) 16 dBi
AT-AN5158-19DP (5G) 19 dBi

Differences in channel Default antenna (Minimum gain): Default antenna (Minimum gain):
range CH36-CH48, Same as left side list.
CH52-CH64,
CH100-CH140,
(Note: Channel 120~CH128 are
disabled)
CH149-CH165
------------------------ ------------------------
Optional antenna: Optional antenna:
None Please see Table 2 (red range)
Differences in Bandwidth Default antenna (Minimum gain): Default antenna (Minimum gain):
20/40/80MHz Same as left side list.
------------------------ -----------------------
Optional antenna: Optional antenna:
None Please see Table 3 (red range)
Software security required Default antenna (Minimum gain): Default antenna (Minimum gain):
for new application – Are GUI Disabled (See Table 4) GUI Enabled and selectable (See Table 5)
the GUIs the same? ----------------------- -----------------------

``

Document Created: 2017-02-10 09:00:25
Document Modified: 2017-02-10 09:00:25

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC