
Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.
EN - English - Quick Guide: This "nRAY" series Quick Guide covers models: nRAYG-60ad (nRAY 60G), nRAYG-60adpair (Wireless Wire nRAY). This is a wireless network device. You can find the product model name on the case label (ID). Please visit the user manual page on for the full up to date user manual. Or scan the QR code with your mobile phone. https://mt.lv/um Technical specifications, brochures and more info about products at https://mikrotik.com/products Configuration manual for software in your language with additional information can be found at https://mt.lv/help If you need help with configuration, please seek a consultant https://mikrotik.com/consultants This device accepts input of 24 V DC, 0.38 A power adapter connected to PoE, which is provided in the original packaging of this device. When using a PoE injector and a different power source, the range is 10-28 V (direct current). First steps: Unscrew the cover to reach Ethernet port; Guide Ethernet cable trough opening; Plug into the Ethernet port and screw clockwise tightly, to ensure water protection; Connect the PoE injector into the computer; Connect the power adapter to the PoE injector; Download WinBox configuration tool ;https://mt.lv/winbox Default IP: 192.168.88.1, user name: and there is no password, for the paired models, please find the password on the sticker;admin Once connected, configure the device, so it has an active Internet connection ;https://mt.lv/configuration Upgrade the RouterOS software to the latest version ;https://mt.lv/upgrade Connect again and choose your country on the left side of the screen, to apply country regulation settings; Set up your router password in the bottom field, to the right and repeat it, it will be used to login next time. Safety Information: Before you work on any MikroTik equipment, be aware of the hazards involved with electrical circuitry, and be familiar with standard practices for preventing accidents. The installer should be familiar with network structures, terms, and concepts. Use only the power supply and accessories approved by the manufacturer, and which can be found in the original packaging of this product. This equipment is to be installed by trained and qualified personnel, as per these installation instructions. The installer is responsible for making sure, that the Installation of the equipment is compliant with local and national electrical codes. Do not attempt to disassemble, repair, or modify the device. This product is intended to be mounted outdoors on a pole but can also be installed indoors. Please read the mounting instructions carefully before beginning installation. Failure to use the correct hardware and configuration or to follow the correct procedures could result in a hazardous situation to people and damage to the system. We cannot guarantee that no accidents or damage will occur due to the improper use of the device. Please use this product with care and operate at your own risk! In the case of device failure, please disconnect it from power. The fastest way to do so is by unplugging the power adapter from the power outlet. This is a Class A product. In a domestic environment, this product might cause radio interference in which case the user might be required to take adequate measures! This MikroTik equipment complies with the FCC, IC, and European Union radiation exposure limits set forth for anExposure to Radio Frequency Radiation: uncontrolled environment. This MikroTik device should be installed and operated no closer than 53 centimeters from your body, occupational user, or the general public. Manufacturer: Mikrotikls SIA, Brivibas gatve 214i Riga, Latvia, LV1039. BG - Български. Бързо ръководство: Това бързо ръководство за серията "nRAY" обхваща модели: nRAYG-60ad (nRAY 60G), nRAYG-60adpair (Wireless Wire nRAY). Това е устройство за безжична мрежа. Можете да намерите името на модела на продукта на етикета на регистъра (ID). Моля, посетете страницата с ръководството за потребителя на за пълното актуализирано ръководство за употреба.https://mt.lv/um-bg Или сканирайте QR кода с мобилния си телефон. Технически спецификации, брошури и повече информация за продуктите на https://mikrotik.com/products Ръководство за конфигуриране на софтуер на вашия език с допълнителна информация можете да намерите наhttps://mt.lv/help-bg Ако имате нужда от помощ при конфигуриране, моля, потърсете консултант https://mikrotik.com/consultants Това устройство приема вход от 24 V DC, 0,38 A адаптер за захранване, свързан към PoE, който се предлага в оригиналната опаковка на това устройство. Когато използвате PoE инжектор и различен източник на захранване, обхватът е 10-28 V (постоянен ток) . This device needs to be upgraded to RouterOS v6.46 or the latest stable version, to ensure compliance with local authority regulations! It is the end users responsibility to follow local country regulations, including operation within legal frequency channels, output power, cabling requirements, and Dynamic Frequency Selection (DFS) requirements. All MikroTik radio devices must be installed according to instructions. Това устройство трябва да бъде надстроено до RouterOS v6.46 или най-новата стабилна версия, за да се гарантира спазването на местните наредби! Крайните потребители са отговорни да спазват местните разпоредби, включително работа в рамките на законни честотни канали, изходна мощност, изисквания за окабеляване и изисквания за динамичен избор на честота (DFS). Всички радиоустройства MikroTik трябва да бъдат инсталирани съгласно инструкциите. Първи стъпки: Развийте капака, за да достигнете Ethernet порт; Направляващ отвор за Ethernet кабел през отвора; Включете Ethernet порта и завийте плътно по посока на часовниковата стрелка, за да осигурите защита от вода; Свържете PoE инжектора в компютъра; Свържете захранващия адаптер към PoE инжектора; Изтеглете инструмент за конфигуриране на WinBox ;https://mt.lv/winbox IP по подразбиране: 192.168.88.1, потребителско име: и няма …
Text truncated - open the document above for the full version.
PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 1 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP Brand Name: MikroTik Model Name: nRAYG-60ad PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 2 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 3 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 4 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 5 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP Adapter PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 6 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PoE PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 7 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 8 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP Bracket PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 9 of 9 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP Metal band
Label Location Bottom of the EUT Label Here
PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 1 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP Brand Name: MikroTik Model Name: nRAYG-60ad PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 2 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 3 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 4 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 5 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 6 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 7 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 8 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 9 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 10 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP PHOTOGRAPHS OF EUT Report No. : EP030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page Number : 11 of 11 TEL : 886-3-656-9065 Issued Date : Jul. 02, 2020 FAX : 886-3-656-9085 EP Report Version : 01 Report Template No.: CB Ver1.0_EP
FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 2 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 Table of Contents History of this test report ................................................................................................................................. 3 Summary of Test Result................................................................................................................................... 4 1 General Description ............................................................................................................................. 5 1.1 EUT General Information ....................................................................................................................... 5 1.2 Testing Location ..................................................................................................................................... 5 2 Maximum Permissible Exposure ........................................................................................................ 6 2.1 Limit of Maximum Permissible Exposure ............................................................................................... 6 2.2 MPE Calculation Method ........................................................................................................................ 7 2.3 Calculated Result and Limit .................................................................................................................... 8 Photographs of EUT v01 FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 3 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 History of this test report Report No. Version Description Issued Date FA030202 01 Initial issue of report Jul. 02, 2020 FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 4 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 Summary of Test Result Report Clause Ref Std. Clause Test Items Result (PASS/FAIL) Remark 2 - Exposure evaluation PA SS - Declaration of Conformity: The test results with all measurement uncertainty excluded are presented in accordance with the regulation limits or requirements declared by manufacturers. Comments and Explanations: The declared of product specification for EUT presented in the report are provided by the manufacturer, and the manufacturer takes all the responsibilities for the accuracy of product specification. Reviewed by: Sam Chen Report Producer: Sandy Chuang FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 5 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 1 General Description 1.1 EUT General Information The Channel Plan(s) Evaluation Mode Frequency Range Operating Frequency (GHz) Modulation Type 60GHz 57-71 GHz 58.32 GHz 60.48 GHz 62.64 GHz 64.80 GHz 1.2 Testing Location Testing Location HW A YA ADD : No. 52, Huaya 1st Rd., Guishan Dist., Taoyuan City, Taiwan (R.O.C.) TEL : 886-3-327-3456 FAX : 886-3-327-0973 JHUBEI ADD : No.8, Lane 724, Bo-ai St., Jhubei City, HsinChu County 302, Taiwan, R.O.C. TEL : 886-3-656-9065 FAX : 886-3-656-9085 Test site Designation No. TW0006 with FCC. Test site registered number IC 4086D with Industry Canada. FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 6 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 2 Maximum Permissible Exposure 2.1 Limit of Maximum Permissible Exposure 15.255(g) Regardless of the power density levels permitted under this section, devices operating under the provisions of this section are subject to the radio frequency radiation exposure requirements specified in §§1.1307(b), 2.1091 and 2.1093 of this chapter, as appropriate. Applications for equipment authorization of devices operating under this section must contain a statement confirming compliance with these requirements for both fundamental emissions and unwanted emissions. Technical information showing the basis for this statement must be submitted to the Commission upon request. (A) Limits for Occupational / Controlled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/ cm²) Averaging Time |E|²,|H|² or S (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842 / f 4.89 / f (900 / f)* 6 30-300 61.4 0.163 1.0 6 300-1500 F/300 6 1500-100,000 5 6 (B) Limits for General Population / Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/ cm²) Averaging Time |E|²,|H|² or S (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 F/1500 30 1500-100,000 1.0 30 Note: f = frequency in MHz ; *Plane-wave equivalent power density FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 7 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 2.2 MPE Calculation Method The MPE was calculated at 53 cm to show compliance with the power density limit. The following formula was used to calculate the Power Density: E (V/m) = d GP××30 Power Density: Pd (W/m²) = 377 2 E E = Electric field (V/m) P = RF output power (W) G = EUT Antenna numeric gain (numeric) d = Separation distance between radiator and human body (m) The formula can be changed to Pd = 2 377 30 d GP × ×× FCC RADIO EXPOSURE TEST REPORT Report No. : FA030202 TEL : 886-3-656-9065 Page Number : 8 of 8 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Template No.: CB-A1_1 Ver1.0 Report Version : 01 2.3 Calculated Result and Limit Worst-case Integrated Band Power of Unwanted …
Text truncated - open the document above for the full version.
FCC RADIO TEST REPORT Report No. : FR030202 TEL : 886-3-656-9065 Page Number : 2 of 48 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Temp.late No.: CB-A9_2 Ver1.0 Report Version : 01 Table of Contents History of this test report ................................................................................................................................. 3 Summary of Test Result................................................................................................................................... 4 1 General Description ............................................................................................................................. 5 1.1 Information .............................................................................................................................................. 5 1.2 Applicable Standards ............................................................................................................................. 7 1.3 Testing Location ..................................................................................................................................... 7 2 Test Configuration of Equipment under Test .................................................................................... 8 2.1 Test Channel Frequencies ..................................................................................................................... 8 2.2 Conformance Tests and Related Test Frequencies............................................................................... 8 2.3 EUT Operation during Test .................................................................................................................... 8 2.4 Accessories ............................................................................................................................................ 9 2.5 Support Equipment ................................................................................................................................. 9 2.6 Far Field Boundary Calculations .......................................................................................................... 10 2.7 Test Setup Diagram ............................................................................................................................. 11 3 Transmitter Test Result ..................................................................................................................... 13 3.1 AC Power Conducted Emissions ......................................................................................................... 13 3.2 Occupied Bandwidth ............................................................................................................................ 18 3.3 EIRP Power .......................................................................................................................................... 24 3.4 Peak Conducted Power ........................................................................................................................ 27 3.5 Transmitter Spurious Emissions ........................................................................................................... 29 3.6 Frequency Stability ............................................................................................................................... 42 3.7 Operation Restriction and Group Installation ....................................................................................... 45 4 Test Equipment and Calibration Data .............................................................................................. 46 5 Measurement Uncertainty ................................................................................................................. 48 Appendix A. Test Photos Photographs of EUT v01 FCC RADIO TEST REPORT Report No. : FR030202 TEL : 886-3-656-9065 Page Number : 3 of 48 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Temp.late No.: CB-A9_2 Ver1.0 Report Version : 01 History of this test report Report No. Version Description Issued Date FR030202 01 Initial issue of report Jul. 02, 2020 FCC RADIO TEST REPORT Report No. : FR030202 TEL : 886-3-656-9065 Page Number : 4 of 48 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Temp.late No.: CB-A9_2 Ver1.0 Report Version : 01 Summary of Test Result Report Clause Ref Std. Clause Test Items Result (PASS/FAIL) Remark 3.1 FCC 15.207 AC Power Conducted Emissions PA SS - 3.2 FCC 15.255(e) Occupied Bandwidth PA SS - 3.3 FCC 15.255(c) EIRP Power PA SS - 3.4 FCC 15.255(c) Peak Conducted Power PA SS - 3.5 FCC 15.255(d) Transmitter Spurious Emissions PA SS - 3.6 FCC 15.255(f) Frequency Stability PA SS - 3.7 FCC 15.255(a),(h) Operation Restriction and Group Installation PA SS - Declaration of Conformity: The test results with all measurement uncertainty excluded are presented in accordance with the regulation limits or requirements declared by manufacturers. Comments and Explanations: The declared of product specification for EUT presented in the report are provided by the manufacturer, and the manufacturer takes all the responsibilities for the accuracy of product specification. Reviewed by: Sam Chen Report Producer: Sandy Chuang FCC RADIO TEST REPORT Report No. : FR030202 TEL : 886-3-656-9065 Page Number : 5 of 48 FAX : 886-3-656-9085 Issued Date : Jul. 02, 2020 Report Temp.late No.: CB-A9_2 Ver1.0 Report Version : 01 1 General Description 1.1 Information 1.1.1 RF General Information RF General Information Frequency Range 57-71 GHz The Channel Plan(s) Channel 1: 58.32 GHz Channel 2: 60.48 GHz Channel 3: 62.64 GHz Channel 4: 64.80 GHz 1.1.2 Modulation IEEE 802.11ad Modulation Scheme MCS Index Modulation Code rate Data rate (Mbit/s) 0 π/2-BPSK 1/2 27.5 1 π/2-BPSK 1/2 385 2 π/2-BPSK 1/2 770 3 π/2-BPSK 5/8 962.5 4 π/2-BPSK 3/4 1155 5 π/2-BPSK 13/16 1251.25 6 π/2-QPSK 1/2 1540 7 π/2-QPSK 5/8 1925 8 π/2-QPSK 3/4 2310 FCC RADIO TEST REPORT Report No. : FR030202 TEL : 88…
Text truncated - open the document above for the full version.
Report No.: FR030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page No. : A1 of A5 TEL : 886-3-656-9065 FAX : 886-3-656-9085 Appendix A. Test Photos Report No.: FR030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page No. : A2 of A5 TEL : 886-3-656-9065 FAX : 886-3-656-9085 1. Photographs of AC Power Conducted Emissions Test Configuration FRONT VIEW REAR VIEW Report No.: FR030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page No. : A3 of A5 TEL : 886-3-656-9065 FAX : 886-3-656-9085 2. Photographs of Transmitter Spurious Emissions Test Configuration Test Configuration: Below 1GHz FRONT VIEW REAR VIEW Report No.: FR030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page No. : A4 of A5 TEL : 886-3-656-9065 FAX : 886-3-656-9085 Test Configuration: 1GHz~40GHz FRONT VIEW REAR VIEW Report No.: FR030202 SPORTON INTERNATIONAL INC. EMC & Wireless Communications Laboratory Page No. : A5 of A5 TEL : 886-3-656-9065 FAX : 886-3-656-9085 Test Configuration: Above 40GHz FRONT VIEW ─────THE END─────
| # | Rule Parts | Frequency Range | Power Output |
|---|---|---|---|
| 1 | 15C | 58.32 GHz - 64.80 GHz | 3.00 mW |
hAP be lite
Equipment Class
NII - Unlicensed National Information Infrastructure TXMA53UG+HbeH
Equipment Class
6ID - 15E 6 GHz Low Power Indoor Access PointTG-LR92
Equipment Class
DTS - Digital Transmission SystemwAP ax
Equipment Class
JAB - Part 15 Class B Digital Device
R11e-LR2
Equipment Class
DTS - Digital Transmission System