Technical data

Release 5.0.x Turin Networks Page 9-1
9.1 Overview
Although the main function of SONET is to provide transport for voice and data traffic over optical fibers,
one of the great features provided by SONET is its remote manageability. In a typical SONET network,
there are actually two networks running within the same fiber. The transport network which carries the
main stream traffic and the management network which carries SONET NEs’ management traffic.
SONET provides separate management channels on its overhead bytes to carry management traffic, pro-
viding communication between NEs. These separate management channels are also known as Data Com-
munication Channels (DCC). Besides the DCC, SONET Transport System requirements also specify the
support of various external management interfaces allowing Network Management Systems (NMS) to
access the DCC for effective management of the remote NEs.
The following drawing shows a simple example of a SONET Operations Communications Networks,
known as Data Communications Networks (DCN).
Figure 9-1 SONET Data Communication Network Architecture
9.2 Operations Communications Interfaces
TE-2020 supports the following physical interfaces to provide operation communications capabilities: