New Rock is a digital solution provider of intelligent VoIP communication and cloud services, with products such as VoIP gateway, IP phone, IP-PBX, call recording solution, audio and video conferencing system, 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.
(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.
Compared to the PSTN, the most important feature of ISDN(Integrated Service Digital Network)is end-to-end digitalization, with terminals based on digital telephones (i.e. ISDN terminals) and a digital connection between the terminals and the switch (the so-called 2B+D BRI interface), which can transmit both voice and data at the same time (telephony and internet access at the same time).
The ISDN is very closely linked to the PSTN and can be considered to have been formed on top of the PSTN to support the expansion of data services. In fact the ISDN is integrated with the core network of the PSTN network. The backbone switches at the location of the convergence and long distance bureaus are identical, and the end office switches generally support both analog and digital users as well.
The demand for data services developed so quickly that ISDN, which was born in response to data services, soon died in response to data services. The characteristics of data services are naturally different from those of voice services, and the demands on the network are also very different; the former has data volumes with asymmetric upstream and downstream bandwidth requirements; the latter has smooth data volumes and requires symmetric upstream and downstream bandwidth.
The ISDN's idea of unifying the design of voice and data to provide integrated services could not meet the needs of the rapid development of data services at that time.