7 Concepts that you need to know about transmission network

7 Concepts that you need to know about transmission network

The transmission network is an important part of the communication network. Without it, data communication is not possible between different devices on the network.

In this blog, we will discuss the main concepts of the transmission network.

1.??????Transmission Network

The?transmission network?is a network used as a transmission channel and is generally used under the switching network, the data network, and the support network to provide a signal transmission and conversion network, and belongs to the basic network of the above three types of networks.

Transmission networks generally study fiber optic cable, copper wire, signal amplifiers, interfaces, connectors, interface converters, microwave systems, PDH, SDH, WDM, ASON, and satellites.

The combination of the transmission network and the data network and the voice network is very close, and the distance from the telecommunication service is relatively far.

2.??????PDH (Plesiochronous Digital Hierarchy)

PDH, a quasi-synchronous digital series, was an early digital transmission system that began to emerge and developed rapidly in the 1980s.

PDH mainly has two series of standards:

§ E1, PCM30/32 channel, 2.048Mbps, is adopted in Europe and China.

§ T1, PCM24/ channel, 1.544Mbps, is adopted in North America.

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3.??????SDH (Synchronous Digital Hierarchy)

SDH, Synchronous Digital Hierarchy, the synchronous digital series, is also a digital transmission system. It is a combination of fiber transmission technology and intelligent network technology.

The earliest proposed SDH concept was the American Bell Communications Institute, which was called Optical Synchronization Network (SONET).

In 1988, the International Telegraph and Telephone Consultative Committee (CCITT) accepted the concept of SONET and renamed it SDH.

4.??????MSTP (Multi-Service Transmission Platform)

MSTP?(SDH-based multi-service transport platform) refers to the multi-service node that provides unified network management for access, processing, and transmission of services such as TDM, ATM, and Ethernet-based on the SDH platform.

5.??????PTN (Packet Transport Network)

PTN?refers to an optical transport network architecture and specific technology: a layer is set between the IP service and the underlying optical transmission medium, which is aimed at the burstiness and statistical recovery of packet traffic. Designed with the requirements of delivery, with packet services as the core and supporting multi-service provisioning, with a lower total cost of ownership (TCO), while adhering to the traditional advantages of optical transmission, including high availability and reliability, efficient bandwidth management mechanisms, and Traffic engineering, convenient OAM and network management, scalability, high security, etc.

6.??????WDM (Wavelength Division Multiplexing)

WDM is a technique that uses multiple lasers to simultaneously transmit multiple beams of different wavelengths on a single fiber. Each signal is modulated by its data (text, voice, video, etc.) and transmitted within its unique ribbon.

7.??????OTN (Optical Transport Network)

OTN?is based on WDM technology. An optical transport network (OTN), a type of network, refers to a transport network that implements transmission, multiplexing, routing, and monitoring of service signals in the optical domain, and guarantees performance indicators and survivability.

OTN technology is the product of the compromise between electrical and all-optical networks. It transplants SDH’s powerful OAM&P concepts and functions into WDM optical networks, effectively offsetting the performance monitoring and maintenance management of existing WDM systems. insufficient.