STM1 Port Mapping

Owned by Kelli Higdon
Last updated: Mar 15, 2024
6 min read

Mappings

  • The mappers map the channel signals to the TUG3 level. 
    The SONET/(SDH) STS-3/OC-3/STM-1 overhead terminators map the TUG-3 over VC-4 and STM-1

  • E1 over STM-1 Multiplexing
    C12 --> VC12 --> TU-12 --x3--> TUG-2 --x7--> TUG-3 --x3--> VC-4 --x1--> AU-4 --x1--> AUG1 --x1--> STM1

  • DS1 over STM-1 Multiplexing
    C11 --> VC11 --> TU-11 --x4--> TUG-2 --x7--> TUG-3 --x3--> VC-4 --x1--> AU-4 --x1--> AUG1 --x1--> STM1

  • E1 over OC-3 Multiplexing
    VT2 SPE    ---> VT2    ---x3---> VT-Group --x7---> STS-1 SPE ---> STS1 ---x3---> STS3 ---> OC3

  • DS1 over OC-3 Multiplexing
    VT1.5 SPE ---> VT1.5 ---x4---> VT-Group --x7---> STS-1 SPE ---> STS1 ---x3---> STS3 ---> OC3

 

E1 to SDH Mapping

SDH/STM1 maps to 63 E1 Ports.  

Supported VM Mapping:

  • Only supported E1 to SDH VM Mapping is: KLM  (Interleaved) mapping as per table below.
    Note: KLM mapping is also refered to TUG2 mapping.

  • ITU-T (Sequential by one) is not supported

Table below maps the STM1Mux ports labeled on the front of the STM1Mux device and 
in the Channel Status Console Menu, to the ITU (KLM/Interleaved) Standards Mapping. 

IMPORTANT:
The Ports colored in Red and marked with X are NOT to be used.   
SDH only supports 63 E1 ports, thus the ports marked with X are not mapped to SDH.  
Therefore, one should not connect any RJ45 cable into those ports when STM1Mux is configured in E1 mode.

 

Critical Release: STM1Mux Version 1.7 and higher supports KLM Interleaved VM Mapping.

Interleaved Mapping (Default in v1.7)

STM1Mux Port

TUG-3

TUG-2

TU12

KLM

 

SMTMux Port

TUG-3

TUG-2

TU12

KLM

 

SMT1Mux Port

TUG-3

TUG2

TU12

KLM

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

1

1

1

1

1.1.1

 

22

2

1

1

2.1.1 

 

43

3

1

1

3.1.1

2

1

1

2

1.1.2

 

23

2

1

2

2.1.2

 

44

3

1

2

3.1.2

3

1

1

3

1.1.3

 

24

2

1

3

2.1.3 

 

45

3

1

3

3.1.3

4

1

2

1

1.2.1

 

25

2

2

1

2.2.1

 

46

3

2

1

3.2.1

5

1

2

2

1.2.2

 

26

2

2

2

2.2.2

 

47

3

2

2

3.2.2

6

1

2

3

1.2.3

 

27

2

2

3

2.2.3

 

48

3

2

3

3.2.3

7

1

3

1

1.3.1

 

28

2

3

1

2.3.1

 

49

3

3

1

3.3.1

8

1

3

2

1.3.2

 

29

2

3

2

2.3.2

 

50

3

3

2

3.3.2

9

1

3

3

1.3.3

 

30

2

3

3

2.3.3

 

51

3

3

3

3.3.3

10

1

4

1

1.4.1

 

31

2

4

1

2.4.1

 

52

3

4

1

3.4.1

11

1

4

2

1.4.2

 

32

2

4

2

2.4.2

 

53

3

4

2

3.4.2

12

1

4

3

1.4.3

 

33

2

4

3

2.4.3

 

54

3

4

3

3.4.3

13

1

5

1

1.5.1

 

34

2

5

1

2.5.1

 

55

3

5

1

3.5.1

14

1

5

2

1.5.2

 

35

2

5

2

2.5.2

 

56

3

5

2

3.5.2

15

1

5

3

1.5.3

 

36

2

5

3

2.5.3

 

57

3

5

3

3.5.3

16

1

6

1

1.6.1

 

37

2

6

1

2.6.1

 

58

3

6

1

3.6.1

17

1

6

2

1.6.2

 

38

2

6

2

2.6.2

 

59

3

6

2

3.6.2

18

1

6

3

1.6.3

 

39

2

6

3

2.6.3

 

60

3

6

3

3.6.3

19

1

7

1

1.7.1

 

40

2

7

1

2.7.1

 

61

3

7

1

3.7.1

20

1

7

2

1.7.2

 

41

2

7

2

2.7.2

 

62

3

7

2

3.7.2

21

1

7

3

1.7.3

 

42

2

7

3

2.7.3

 

63

3

7

3

3.7.3

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

 

Regular Mapping (Old Mapping In v1.5 and Lower)

STM1Mux Port

TUG-3

TUG-2

TU12

KLM

 

SMTMux Port

TUG-3

TUG-2

TU12

KLM

 

SMT1Mux Port

TUG-3

TUG2

TUG2

KLM

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

1

1

1

1

1.1.1

 

22

2

1

1

2.1.1 

 

43

3

1

1

3.1.1

2

1

2

1

1.2.1

 

23

2

2

1

2.2.1

 

44

3

2

1

3.2.1

3

1

3

1

1.3.1

 

24

2

3

1

2.3.1 

 

45

3

3

1

3.3.1

4

1

4

1

1.4.1

 

25

2

4

1

2.4.1

 

46

3

4

1

3.4.1

5

1

5

1

1.5.1

 

26

2

5

1

2.5.1

 

47

3

5

1

3.5.1

6

1

6

1

1.6.1

 

27

2

6

1

2.6.1

 

48

3

6

1

3.6.1

7

1

7

1

1.7.1

 

28

2

7

1

2.7.1

 

49

3

7

1

3.7.1

8

1

1

2

1.1.2

 

29

2

1

2

2.1.2

 

50

3

1

2

3.1.2

9

1

2

2

1.2.2

 

30

2

2

2

2.2.2

 

51

3

2

2

3.2.2

10

1

3

2

1.3.2

 

31

2

3

2

2.3.2

 

52

3

3

2

3.2.2

11

1

4

2

1.4.2

 

32

2

4

2

2.4.2

 

53

3

4

2

3.4.2

12

1

5

2

1.5.2

 

33

2

5

2

2.5.2

 

54

3

5

2

3.5.2

13

1

6

2

1.6.2

 

34

2

6

2

2.6.2

 

55

3

6

2

3.6.2

14

1

7

2

1.7.2

 

35

2

7

2

2.7.2

 

56

3

7

2

3.7.2

15

1

1

3

1.1.3

 

36

2

1

3

2.1.3

 

57

3

1

3

3.1.3

16

1

2

3

1.2.3

 

37

2

2

3

2.2.3

 

58

3

2

3

3.2.3

17

1

3

3

1.3.3

 

38

2

3

3

2.3.3

 

59

3

3

3

3.3.3

18

1

4

3

1.4.3

 

39

2

4

3

2.4.3

 

60

3

4

3

3.4.3

19

1

5

3

1.5.3

 

40

2

5

3

2.5.3

 

61

3

5

3

3.5.3

20

1

6

3

1.6.3

 

41

2

6

3

2.6.3

 

62

3

6

3

3.6.3

21

1

7

3

1.7.3

 

42

2

7

3

2.7.3

 

63

3

7

3

3.7.3

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

X

X

X

X

 

 

X

X

X

X

 

 

X

X

X

X

 

 

 

T1 to SONET Mapping

SONET/STS-3/OC3 maps to 84 T1 Ports.
Table below maps the STM1Mux ports labeled on the front of the STM1Mux device and 
in the Channel Status Console Menu, to the ITU Standards Mapping. 

STM1Mux Port

STS-1

VT-Group

VT1.5

     

SMTMux Port

STS-1

VT-Group

VT1.5

     

SMT1Mux Port

STS-1

VT-Group

VT1.5

1

1

1

1

 

29

2

1

1

 

57

3

1

1

2

1

2

1

 

30

2

2

1

 

58

3

2

1

3

1

3

1

 

31

2

3

1

 

59

3

3

1

4

1

4

1

 

32

2

4

1

 

60

3

4

1

5

1

5

1

 

33

2

5

1

 

61

3

5

1

6

1

6

1

 

34

2

6

1

 

62

3

6

1

7

1

7

1

 

35

2

7

1

 

63

3

7

1

8

1

1

2

 

36

2

1

2

 

64

3

1

2

9

1

2

2

 

37

2

2

2

 

65

3

2

2

10

1

3

2

 

38

2

3

2

 

66

3

3

2

11

1

4

2

 

39

2

4

2

 

67

3

4

2

12

1

5

2

 

40

2

5

2

 

68

3

5

2

13

1

6

2

 

41

2

6

2

 

69

3

6

2

14

1

7

2

 

42

2

7

2

 

70

3

7

2

15

1

1

3

 

43

2

1

3

 

71

3

1

3

16

1

2

3

 

44

2

2

3

 

72

3

2

3

17

1

3

3

 

45

2

3

3

 

73

3

3

3

18

1

4

3

 

46

2

4

3

 

74

3

4

3

19

1

5

3

 

47

2

5

3

 

75

3

5

3

20

1

6

3

 

48

2

6

3

 

76

3

6

3

21

1

7

3

 

49

2

7

3

 

77

3

7

3

22

1

1

4

 

50

2

1

4

 

78

3

1

4

23

1

2

4

 

51

2

2

4

 

79

3

2

4

24

1

3

4

 

52

2

3

4

 

80

3

3

4

25

1

4

4

 

53

2

4

4

 

81

3

4

4

26

1

5

4

 

54

2

5

4

 

82

3

5

4

27

1

6

4

 

55

2

6

4

 

83

3

6

4

28

1

7

4

 

56

2

7

4

 

84

3

7

4

 

STM1Mux to NSG Mapping

 

ERRATA 

  • May 29 2014
    On releases before 1.7 E1-SDH Port mapping used non-standard OC3 mapping method.
    On release 1.7 the E1-SDH Port mapping defaults to KLM (Interleaved Mode) which is one of the standards.
    Note: E1-SDH ITU-T Mapping is not supported. 

  • Sep 14 2013 
    All T1 ports are known to work properly in production environment. 
    There are no known issues on the T1/SONET configuration on firmware v1.2

 

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