SS7 Network Testing and Maintenance Messages


   SIF:  MSU-SNTM Signalling information field:

   The frame structura is the same as the SNMM frame.

                                          message flow ----->  |
    +- - - - - - - - - - - -+- - + - - +---+---+---+-----+-----+- - -
    | Test pattern          | LI |spare|H1 |H0 |SLC| OPC | DPC |  SIO
    +- n x 8 bit - 1<=n<=15 +-4- + -4- +-4-+-4-+-4-+--14-+--14-+- - -
                              |
                            length             |-routing label-|
                           indicator           |-----label-----|

     DPC - destination point code (cod: binary)
     OPC - originating point code (cod: binary)
     SLC - signalling link code
     H0  - heading code 0
     H1  - heading code 1


    Network Management Message types:  5.4/Q.707

     H1:   H0:
     ----  0000      Spare
     0001  0001  SLTM Signalling link test message
     0010  0001  SLTA Signalling link test acknowledgement message
     ------0010...1111     Spare