Cisco Systems 8600 Series manual General Sonet Notes, Sonet Section, Line, and Path Descriptions

General SONET Notes

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IEC 801-2, EN55022

Safety: EN 60950, UL 1950

Bellcore NEBS:Level 3 compliant

Optical Safety:

—Intermediate Reach IEC 825-1 (Class 1)

—Long Reach IEC 825-1 (Class 36)

General SONET Notes

SONET is defined across three elements, section, line, and path as shown in Figure 6-13and described in Table 6-10.An advantage of this tiered approach is that management control can be exercised at each level, for example at the section level independent of the line or path level.

Figure 6-13 SONET Section, Line, and Path

Section Section Section

CPE

Switch

LTE

STE STE

Line

Path

Switch

LTE

CPE

12196

Table 6-10	SONET Section, Line, and Path Descriptions
Unit	Description
Section	A section is the fiber optic cable between two active elements such as simple repeaters. The active
	element terminating these sections is called Section Terminating Equipment (STE).
Line	A line is a physical element that contains multiple sections and repeaters and is terminated by line
	terminating equipment (LTE) at each end.
Path	A path includes sections and lines and terminates at the customer premises equipment (CPE).

Table 6-11provides a cross-reference between OC-n optical carrier levels and the equivalent STS-n and SDH-n levels. It also includes the associated line rates.

Table 6-11	Digital Hierarchies
				STM-n
	STS-n		SDH-n	Synchronous
OC-n	Synchronized	Line Rates	Synchronized	Transport
Optical Carrier	Transport Signal	(Mbps)	Digital Hierarchy	Module
OC-1	STS-1	51.84
OC-3	STS-3	155.52	SDH-1	STM-1
OC-12	STS-12	622.08	SDH-4	STM-4
OC-48	STS-48	2488.32	SDH-16	STM-12

BXM T3/E3, 155, and 622 6-27