1

Scope

1

2

References

1

3

Terminology and definitions

2

4

Abbreviations

2

5

Performance limits and objectives

2

6

Maintenance records

3

7

Fault reporting procedures

3

7.1

Control and sub-control status

3

7.2

Fault information exchange

3

8

Fault localization

4

9

Maintenance tests

4

9.1

General

4

9.2

Maintenance intervention tests

4

9.3

Returning to service tests

4

9.4

Loopback tests

7

9.5

Test access at Digital Cross-Connect (DXC) equipment

7

10

In-service monitoring

7

11

Temporary service restoration

8

11.1

Mechanisms for implementing temporary service restoration

8

11.2

Time to restore service

8

11.3

Restoration procedure

9

11.4

Returning to normal routing

9

11.5

Information that should be exchanged

9

12

Automatic rerouting of international data transmission links

9

13

Precautions to be taken in the use of DXCs

9

14

Planned maintenance

10