We provide downloadable documents such as user manuals, product datasheet, product brochures, product leaflets, etc.
Together with our agents and distributors, we provide convenient local service and quality after-sales maintenance service. The standard service provided is 5×8 (5 days a week, 8 hours a day) technical service support, providing customers with maintenance, repair and remote technical support services through phone and e-mail.
The FAQ section summarizes the solutions to some problems in the installation, configuration and use of New Rock hardware and software products.
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(New Rock Technologies, Inc.) is a new generation of intelligent communication equipment and solution provider. We provide future-oriented intelligent communication products and services to customers such as telecom operators, governments, enterprises, etc.
Since the establishment 19 years ago, New Rock has always taken R&D as our core mission and insisted on independent innovation. New Rock has more than 80 certificates and honors, with 19 years of industry brand recognition and influence, and is the common choice of many customers!
New Rock has established a nationwide service system with Shanghai headquarters as the center and six branches or offices in Beijing, Guangzhou, Shenzhen, Shandong, Wuhan and Chengdu to provide customers with perfect pre-sales consultation and after-sales service. At the same time, we provide products and services for customers in the United States, Middle East, Thailand, Malaysia, Indonesia, Philippines and other countries and regions with local distributors, and our products are exported to more than 60 countries in Southeast Asia, Europe, America, Middle East and Africa.
New Rock guarantees to serve customers throughout the whole sales process. We can provide - pre-sales service (solution communication/technical response, assistance in bidding, development of solution proposal), in-sales service (installation guidance, on-site support, project cutover), after-sales service (project acceptance test, maintenance documentation transfer, technical training, remote service). Please leave your message for any needs, we will do our best to serve you!
Since its establishment in 2003, New Rock has always taken R&D as its core and insisted on independent innovation. Years of technology accumulation have enabled New Rock to have a complete product line and rich practical experience in unified communications field. With 27 pieces of software copyrights, 50% of R&D technicians, 25% of R&D expenditure in sales, and tech cooperation with Fudan University, we have collaborated to apply visible light communication products for the nuclear power plant communication and other fields. Welcome to become New Rock partner! Hand in hand together to build a bright future!
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Public Switched Telephone Network
The PSTN, Public Switched Telephone Network, was the first to emerge.
The PSTN is a public-facing telephone network (as opposed to an intra-enterprise or industry-specific network) through which we all make calls almost every day in our daily lives.
Nowadays the PSTN is a generic term for the operator's telephone network, even though nowadays the operator's telephone network is progressively based on VoIP technology, more specifically the PSTN is known as IMS, VoLTE, etc.
The definition of the PSTN when it emerged was a public telephone network based on circuit-switched technology. It was made up of circuit-switched voice exchanges and fixed-line terminals.
In contrast to the later emergence of ISDN (digital network), the PSTN is also generally referred to as an analog telephone network. However, the core of the later PSTN - the switch and the circuit trunk (Trunk) that connects the switch - is completely digital.
Of course it is correct to call the PSTN an analog telephone network because its terminals, and the connections between the switches and the terminals, the so-called last mile, are based on analog technology and are designed specifically for voice services.
The PSTN can only carry one service, telephony (which is what it was originally designed for, although dial-up internet access via modem is also possible, but it is very costly, extremely inefficient and affects the reception of calls), and as the demand for data communication increases, it gradually no longer meets the demands placed on the operator's network.
Tel:021-61202700 / 52217917
Address:5/F Block B, Building 1, No.188 Pingfu Road, Xuhui District, Shanghai 200231, China
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