363-206-295
Maintenance Description
9-28 Issue 1 December 1997
Tariff verification refers to the process of collecting PM data on end-to-end path
services (for example, DS1 and DS3). This data can be used to verify whether or
not a customer is receiving the quality of service requested. Refer to Appendix A,
"A SONET Overview," for more information on SONET PM.
Figure 9-9 shows DS1/DS3 line and path and DS3 path PM.
Figure 9-9. DS1/DS3 Line and Path and DS3 Path Performance Monitoring
The following are definitions and explanations for the terms used in the figure:
■ Line — A line is a physical transport vehicle that provides the means of
moving digital information between two points in a network. The line is
characterized by a metallic transmission medium and its specific coding
type. A line is bounded by its two end points, known as line terminations. A
line termination is the point where the electrical, bipolar line signal is
generated and transmitted, or received and decoded.
— DS1 (DDM-2000 OC-3 Only) — DS1 line for AMI or B8ZS coding is
monitored and the errored second (ES-L) data is displayed for the
incoming signal from the DSX-1.
— DS3 — DS3 line for B3ZS coding is monitored and the data is
displayed in CV-L, ES-L, and SES-L registers for the incoming signal
from the DSX-3.
■ Path — A path is a framed digital stream between two points in a network
and represents digital signal transport at a specified rate, independent of
the equipment and media providing the physical means of transporting the
signal. A path is defined by its two end points, called path terminations,
where its frame structure is generated and decoded. A path may be carried
wholly within one transport segment (line), or it may span a sequential
arrangement of two or more transport segments.
DSX-1*
DS3 Path
DSX-3
DS1*/DS3 Line, Path
DDM-2000
OC-3/OC-12
OC-3/OC-12
* OC-3 Shelves Only.
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