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Configuring Channelized STM1 Interfaces

 

To specify the channel number, include it after the colon (:) in the interface name. For example, a Channelized STM1-to-E1 PIC in FPC 1 and slot 1 will have the following physical interface, depending on the media type:

The E1 channel number can be from 0 through 62.

This section contains the following topics:

Configuring Channelized STM1 Interface Properties

To configure the interface properties for Channelized STM1-to-E1 PICs, include the e1-options and sonet-options statements for both sides of the connection. The following configurations list all the valid statements.

To specify options for each of the E1 channels on the Channelized STM1-to-E1 PIC, include the e1-options statement at the [edit interfaces interface-name] hierarchy level:

Note

When a channelized STM1 interface experiences a line transition, the E1 channels configured in unframed mode log a large number of drops (around 24,000) as the channelized STM1 interface clocks resynchronize. This does not occur on framed channels, because the framing resynchronizes clocks very quickly.

To specify options for the SONET/SDH side of the connection, include the sonet-options statement at the [edit interfaces interface-name] hierarchy level:

Note

On channelized STM1 interfaces, you should configure the clock source on one side of the connection to be internal (the default Junos configuration) and on the other side of the connection to be external.

For information about Frame Relay DLCI limitations for channelized interfaces, see Data-Link Connection Identifiers on Channelized Interfaces. For more information about Frame Relay DLCIs, see Configuring Frame Relay DLCIs. For information about DLCI sparse mode, see the Junos OS Administration Library.

For more information about specific statements, see E1 Interfaces Overview, SONET/SDH Interfaces Overview, and T1 Interfaces Overview. For a configuration example, see Example: Configuring Channelized STM1 Interfaces.

Configuring Virtual Tributary Mapping of Channelized STM1 Interfaces

You can configure virtual tributary mapping to use KLM mode or ITU-T mode. To configure virtual tributary mapping, include the vtmapping statement at the [edit chassis fpc slot-number pic pic-number] hierarchy level:

By default, virtual tributary mapping uses KLM mode. For more information, see the Junos OS Administration Library.

For the Channelized STM1 IQ and IQE PICs, you can configure virtual tributary mapping by including the vtmapping statement at the [edit interfaces cau4-fpc/pic/port sonet-options] hierarchy level:

Table 1 lists the KLM mappings used by the channelized STM1-to-E1 PIC interfaces. The PIC defaults to KLM numbering with an offset of –1; for example, KLM 1= STM1 PIC 0.

Table 1: Channelized STM1-to-E1 Channel Mapping

Channel Number

KLM Number

Tributary Unit Group 3

Tributary Unit Group 2

Virtual Tributary

ITU-T Number

0

1

1

1

1

1

1

2

1

1

2

22

2

3

1

1

3

43

3

4

1

2

1

4

4

5

1

2

2

25

5

6

1

2

3

46

6

7

1

3

1

7

7

8

1

3

2

28

8

9

1

3

3

49

9

10

1

4

1

10

10

11

1

4

2

31

11

12

1

4

3

52

12

13

1

5

1

13

13

14

1

5

2

34

14

15

1

5

3

55

15

16

1

6

1

16

16

17

1

6

2

37

17

18

1

6

3

58

18

19

1

7

1

19

19

20

1

7

2

40

20

21

1

7

3

61

21

22

2

1

1

2

22

23

2

1

2

23

23

24

2

1

3

44

24

25

2

2

1

5

25

26

2

2

2

26

26

27

2

2

3

47

27

28

2

3

1

8

28

29

2

3

2

29

29

30

2

3

3

50

30

31

2

4

1

11

31

32

2

4

2

32

32

33

2

4

3

53

33

34

2

5

1

14

34

35

2

5

2

35

35

36

2

5

3

56

36

37

2

6

1

17

37

38

2

6

2

38

38

39

2

6

3

59

39

40

2

7

1

20

40

41

2

7

2

41

41

42

2

7

3

62

42

43

3

1

1

3

43

44

3

1

2

24

44

45

3

1

3

45

45

46

3

2

1

6

46

47

3

2

2

27

47

48

3

2

3

48

48

49

3

3

1

9

49

50

3

3

2

30

50

51

3

3

3

51

51

52

3

4

1

12

52

53

3

4

2

33

53

54

3

4

3

54

54

55

3

5

1

15

55

56

3

5

2

36

56

57

3

5

3

57

57

58

3

6

1

18

58

59

3

6

2

39

59

60

3

6

3

60

60

61

3

7

1

21

61

62

3

7

2

42

62

63

3

7

3

63

Table 2 lists the KLM mappings used by the channelized STM1-to-T1 PIC interfaces. The PIC defaults to KLM numbering with an offset of –1; for example, KLM 1= STM1 PIC 0.

Table 2: Channelized STM1-to-T1 Channel Mapping

Channel Number

KLM Number

Tributary Unit Group 3

Tributary Unit Group 2

Virtual Tributary

ITU-T Number

0

1

1

1

1

1

1

2

1

1

2

22

2

3

1

1

3

43

3

4

1

2

1

4

4

5

1

2

2

25

5

6

1

2

3

46

6

7

1

3

1

7

7

8

1

3

2

28

8

9

1

3

3

49

9

10

1

4

1

10

10

11

1

4

2

31

11

12

1

4

3

52

12

13

1

5

1

13

13

14

1

5

2

34

14

15

1

5

3

55

15

16

1

6

1

16

16

17

1

6

2

37

17

18

1

6

3

58

18

19

1

7

1

19

19

20

1

7

2

40

20

21

1

7

3

61

21

22

2

1

1

2

22

23

2

1

2

23

23

24

2

1

3

44

24

25

2

2

1

5

25

26

2

2

2

26

26

27

2

2

3

47

27

28

2

3

1

8

28

29

2

3

2

29

29

30

2

3

3

50

30

31

2

4

1

11

31

32

2

4

2

32

32

33

2

4

3

53

33

34

2

5

1

14

34

35

2

5

2

35

35

36

2

5

3

56

36

37

2

6

1

17

37

38

2

6

2

38

38

39

2

6

3

59

39

40

2

7

1

20

40

41

2

7

2

41

41

42

2

7

3

62

42

43

3

1

1

3

43

44

3

1

2

24

44

45

3

1

3

45

45

46

3

2

1

6

46

47

3

2

2

27

47

48

3

2

3

48

48

49

3

3

1

9

49

50

3

3

2

30

50

51

3

3

3

51

51

52

3

4

1

12

52

53

3

4

2

33

53

54

3

4

3

54

54

55

3

5

1

15

55

56

3

5

2

36

56

57

3

5

3

57

57

58

3

6

1

18

58

59

3

6

2

39

59

60

3

6

3

60

60

61

3

7

1

21

61

62

3

7

2

42

62

63

3

7

3

63

63

64

4

1

1

24

64

65

4

1

2

45

65

66

4

1

3

66

66

67

4

2

1

27

67

68

4

2

2

48

68

69

4

2

3

69

69

70

4

3

1

30

70

71

4

3

2

51

71

72

4

3

3

72

72

73

4

4

1

33

73

74

4

4

2

54

74

75

4

4

3

75

75

76

4

5

1

36

76

77

4

5

2

57

77

78

4

5

3

78

78

79

4

6

1

39

79

80

4

6

2

60

80

81

4

6

3

81

81

82

4

7

1

42

82

83

4

7

2

63

83

84

4

7

3

84