Broadband transport — the synchronous digital hierarchy

  • Authors:

  • T. S. Brown;D. Rowland;A. Vinall;A. O‘Neill

  • Affiliations:

  • BT Laboratories, Martlesham Heath, Ipswich, Suffolk, England IP 5 3RE;BT Laboratories, Martlesham Heath, Ipswich, Suffolk, England IP 5 3RE;BT Laboratories, Martlesham Heath, Ipswich, Suffolk, England IP 5 3RE;BT Laboratories, Martlesham Heath, Ipswich, Suffolk, England IP 5 3RE

  • Venue:
  • BT Technology Journal
  • Year:
  • 1998

Quantified Score

Hi-index 0.00

Visualization

Abstract

All data networks require a physical transmission medium to convey information between network nodes. Within a local environment this physical medium might, for example, take the form of an Ethernet LAN, but wide area connections are provided using telecommunications constant bit rate transmission equipment. Furthermore, the assumption that data networking is simply the provision of WAN connectivity for large corporate networks is becoming dated. The explosion of interest in the Internet means that, for transport networks, the term data may encompass voice, video and multimedia applications for delivery to both home and office. This places additional requirements on the network infrastructure as each service has specific transport requirements.Network operators are currently in the process of deploying core networks of equipment conforming to the ITU-T Recommendations for a synchronous digital hierarchy (SDH), but many networks also contain a significant proportion of older transmission technologies. This paper provides a review of transmission technology and describes the impact of such networks on the transport of data.