Events: MTP Layer 3

 Event structure What is a BOP-SS7 event?

MTP-L3 decoding Using the Clarinet Event-Editor with an appropriate filter.

Protocol stack Defining a list of protocols used in the current filter.

Standards
  • Q704 MTP Layer 3
  • Q704 SNMM
  • Q707 SNTM
  • Q713 SCCP
  • Q723 TUP
  • Q763 ISUP

Options Changing the display conditions in the current filter.

Clarinet Event-Editor: MTP-L3 decoding

ss7_l3_decod.gif (15220 octets)

 Event information Date Date of the event (end of BOP frame) in the format: hh:mm:ss/xxx.y  
N The interface number which identifies the Clarinet-interface connected to the host.
Link type
  • TS: Signalling Link Transmit direction
  • RS: Signalling Link Receive direction
  • TD: Data Link Transmit direction
  • RD: Data Link Receive direction
Dx The level of Decoding as specified in the filter (Stack).

Protocol fields MTP-3 <PDU type>
Address
Ctrl

Data field Raw data field displayed if no upper layer protocol is defined in the filter.
The display format specified in the filter is used.		  

MTP-L3 Protocol fields

 <PDU_type> Type of message within the Service in the format xxxx/yyy (designation).
  xxxx Service indicator.
  yyy Message type with its acronym.
  designation Message designation.

Address In the following format ss DPC:xxxxx OPC:xxxxx SLC:xx (SNMM, SNTM)
or ss DPC:xxxxx OPC:xxxxx SLS:xx (SCCP)
or ss DPC:xxxxx OPC:xxxxx CIC:xxxx (TUP)
or ss DPC:xxxxx OPC:xxxxx SLS:xx CIC:xxxx (ISUP)
  ss Value of the Sub-service field with x (from 0 to 3).
Ix International network.
ix Spare.
Nx National network.
nx Reserved for national use.
  DPC:xxxxx Value of Destination Point Code.
  OPC:xxxxx Value of Origin Point Code.
  SLC:xx Value of Signalling Link Code.
  SLS:xx Value of Signalling Link Selection.
  CIC:xxxx Value of Circuit Identifier Code.

Ctrl These parameters are displayed according to the display mode selected in the filter :
Identified mode

(xx) len:yy >> designation
value

 >> designation
value
Detailed mode (xx) len:yy >> designation
octet 1 : ......
octet i : bkl field
              ......
octet j : info
octet n : ......		 >> designation
octet 1 : ......
octet i : bkl field
              ......
octet j : info
octet n : ......
  xx Parameter code in hexadecimal. -- for the implicit values of the mandatory parameters.
  yy Length of parameter content. -- for the implicit values of the mandatory parameters.
  designation Parameter designation according to the standard.
  value Only with Identified mode, parameter content in hexadecimal.
  bkl_field Only with Detailed mode, every field is displayed with its bit configuration within the relevant octet and its meaning according to the standard.
  info Only with Detailed mode, conveyed information.

Protocol stack applied

ss7_l3_stack.gif (7283 octets)

 

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