YZZGWN7831Layer 3 Aggregation Managed Switch

Grandstream Networks, Inc. Address: 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300; Fax: 1-617-2491987 Email: [email protected] Product Power Similarity Declaration Date: 2023/07/20 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Dear Sir/Madam, We, Grandstream Networks, Inc., hereby declare that we have a product named as Layer 3 Aggregation Managed Switch, FCC ID:YZZGWN7831 (model:GWN7831) was tested by Shenzhen Accurate Technology Co., Ltd., meanwhile, for our marketing purpose, the GWN7831 will be configured with three different power modules, the other is the same. We confirm that all information above is true, and we’ll be responsible for all the consequences. Please contact me if you have any question. Sincerely Yours, Signature: Ning Wei Manager

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Fax: 1-617-2491987 Email: [email protected] CFR 47 §2.911(d)(5)(i) Attestation Letter Attestation Letter Date: 2023/07/20 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(i) Filing FCC ID: YZZGWN7831 Grandstream Networks, Inc. certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, Signature Contact Person: Ning Wei Title:Manager Company Name & Address: Grandstream Networks, Inc. &126 Brookline Ave, 3rd Floor Boston, MA 02215, USA

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Fax: 1-617-2491987 Email: [email protected] CFR 47 §2.911 (d)(5)(ii) Attestation Letter Attestation Letter Date: 2023/07/20 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(5)(ii) Filing FCC ID: YZZGWN7831 Grandstream Networks, Inc. certifies that as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, Signature Contact Person: Ning Wei Title:Manager Company Name & Address: Grandstream Networks, Inc.&126 Brookline Ave, 3rd Floor Boston, MA 02215, USA

U.S. AGENT LETTER OF ATTESTATION Date: 2023-07-20 FEDERAL COMMUNICATIONS COMMISSION Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: Attestation Statements CFR 47 §2.911(d)(7) Filing FCC ID: YZZGWN7831 Grandstream Networks, Inc. certifies that, as of the date of the filing of the application, Grandstream Networks, Inc. is our designated U.S. agent for service of process for the above referenced FCC ID. Grandstream Networks, Inc. accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Grandstream Networks, Inc. accepts, as of the date of the filing of the application, the obligation of the designated U.S. agent for service of process for the above referenced FCC ID. Designated U.S. Agent and Applicant Information: Name: Grandstream Networks, Inc. Address: 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA FRN: 0020352431 Tel.: 1-617-5669300 Email: [email protected] Signed by (printed name): Ning Wei Signature:

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Fax: 1-617-2491987 Email: [email protected] QA-FR-170-B 7/29/2014 FCC Authorization Date: 2023-07-20 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Agent Authorization To whom it may concern: We Grandstream Networks, Inc., the undersigned, hereby authorizes Shenzhen Accurate Technology Co., Ltd. to act on its behalf in all matters relating to application for Equipment authorization, including the signing of all documents relating to these matters. All acts carried out by Shenzhen Accurate Technology Co., Ltd. on our behalf shall have the same effect as our own action. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. This authorization is valid until further written notice from the applicant. Sincerely Yours, Signature: Ning Wei Manager

Grandstream Networks, Inc. 126 Brookline Ave, 3rd Floor Boston, MA 02215, USA Tel: 1-617-5669300 Fax: 1-617-2491987 Email: [email protected] FCC Confidential Authorization Date: 2023-07-20 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: YZZGWN7831 In accordance with Sections 0.457 and 0.459 of the Commission’s Rules, Grandstream Networks, Inc. hereby requests long-term confidential treatment of information accompanying this application as outlined below:  Block Diagram  Schematics  Operation Description The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely Yours, Signature: Ning Wei Manager

Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 External Photos Page 1 of 5 External Photos Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 External Photos Page 2 of 5 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 External Photos Page 3 of 5 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 External Photos Page 4 of 5 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 External Photos Page 5 of 5

Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM LABEL AND LOCATION Page 1 of 1 FCC ID Label FCC ID Label Location Information The label shown shall be permanently affixed at a conspicuous location on the device and be readily visible to the user at the time purchase (Labeling requirements per 2.925)

Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 1 of 11 Internal photos Power module: ADO-60W1 13 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 2 of 11 Power module: PA-1061-13H1 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 3 of 11 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 4 of 11 Power module: R0070B Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 5 of 11 Main board Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 6 of 11 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 7 of 11 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 8 of 11 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 9 of 11 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 10 of 11 Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Internal Photos Page 11 of 11

Note: This report may contain data that are not covered by the A2LA accreditation and are marked with an asterisk “★”. Shenzhen Accurate Technology Co., Ltd. is not responsible for the authenticity of any test data provided by the applicant. Data included from the applicant that may affect test results are marked with an asterisk ’*’. Customer model name, addresses, names, trademarks etc. are not considered data. This report cannot be reproduced except in full, without prior written approval of the Company. Unless otherwise stated the results shown in this test report refer only to the sample(s) tested. This report is valid only with a valid digital signature. The digital signature may be available only under the Adobe software above version 7.0. Shenzhen Accurate Technology Co., Ltd. 1/F., Building A, Changyuan New Material Port, Science & Industry Park, Nanshan District, Shenzhen, Guangdong, P.R. China Tel: +86 755-26503290 Fax: +86 755-26503290 Web: www.atc-lab.com Version 18: 2023-01-30 Page 1 of 39 FCC-EMC TEST REPORT Applicant Name : Grandstream Networks, Inc. Address : 126 Brookline Ave., 3rd Floor Boston, MA 02215, USA Report Number : RA230630-37672E-EM-01 FCC ID: YZZGWN7831 Test Standard (s) FCC PART 15B, CLASS A Sample Description Product Type: Layer 3 Aggregation Managed Switch Model No.: GWN7831 Trade Mark: GRANDSTREAM Date Received: 2023-06-30 Date of Test: 2023-07-10 to 2023-07-11 Report Date: 2023-07-18 Test Result: Pass* * In the configuration tested, the EUT complied with the standards above. Prepared and Checked By: Approved By: Zeki Ma Candy Li EMC Engineer EMC Engineer Shenzhen Accurate Technology Co., Ltd. Report No.: RA230630-37672E-EM-01 Version 18: 2023-01-30 Page 2 of 39 FCC-EMC TABLE OF CONTENTS 1. TEST RESULTS SUMMARY ................................................................................................... 5 2. GENERAL INFORMATION ...................................................................................................... 6 2.1. Description of Device (EUT) .......................................................................................................... 6 2.2. Test mode ......................................................................................................................................... 6 2.3. General disclaimer ........................................................................................................................... 6 2.4. Accessory and Auxiliary Equipment and Cables ........................................................................ 7 2.5. Description of Test Facility ............................................................................................................. 7 2.6. Measurement Uncertainty .............................................................................................................. 7 3. MEASURING DEVICE AND TEST EQUIPMENT ................................................................ 8 3.1. For Conducted Emission Test ....................................................................................................... 8 3.2. For Radiated Emission Measurement .......................................................................................... 8 4. CONDUCTED EMISSION MEASUREMENT ........................................................................ 9 4.1. Block Diagram of Test Setup ......................................................................................................... 9 4.2. Power Line Conducted Emission Measurement Limits (Class A) .......................................... 10 4.3. Test mode description ................................................................................................................... 10 4.4. Manufacturer .................................................................................................................................. 10 4.5. Operating Condition of EUT ......................................................................................................... 10 4.6. Test Procedure ............................................................................................................................... 11 4.7. Data Explain ................................................................................................................................... 11 4.8. Power Line Conducted Emission Measurement Results ........................................................ 11 5. RADIATED EMISSION MEASUREMENT ........................................................................... 20 5.1. Block Diagram of Test Setup ....................................................................................................... 20 5.2. Radiated Emission Limit (Class A) .............................................................................................. 21 5.3. Test mode description ................................................................................................................... 22 5.4. Manufacturer .................................................................................................................................. 22 5.5. Operating Condition of EUT ......................................................................................................... 22 5.6. Test Procedure ............................................................................................................................... 23 5.7. Data Sample ................................................................................................................................... 23 5.8. Radiated Emission Measurement Result ................................................................................... 23 Shenzhen Accurate Technology Co., Ltd. Report No.: RA230630-37672E-EM-01 Version 18: 2023-01-30 Page 3 of 39 FCC-EMC DOCUMENT REVISION HISTORY Revision Number Report Number Description of Revision Date of Revision 0 RA230630-37672E-EM-01 Original Report 2023-07-18 Shenzhen Accura…

Text truncated - open the document above for the full version.

Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Test Photos Page 1 of 6 Photo of Conducted Emission Measurement For Test mode 1/2/3: Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Test Photos Page 2 of 6 For Test mode 4: Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Test Photos Page 3 of 6 Photo of Radiated Emission Measurement (Below 1GHz) For Test mode 1/2/3: Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Test Photos Page 4 of 6 For Test mode 4: Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Test Photos Page 5 of 6 Photo of Radiated Emission Measurement (Above 1GHz) For Test mode1/2/3: Shenzhen Accurate Technology Co., Ltd. Project No.: RA230630-37672E-EM-01 Test Photos Page 6 of 6 For Test mode 4: