Events: MTP Layer 3

	Event Structure	What is a BOP-SS7 event ?...
	MTP-L3 decoding	by using Clarinet Event-Editor with a filter ...
	Protocol stack	Which protocol specifications to be defined 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	Optional field of the conveyed data, displayed if no upper layer of protocol has to be decoded. 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)

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

The attached 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 : ......

Parameter code in hexadecimal. -- for the implicit values of the mandatory parameters.

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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updated: 27-Feb-04