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Power point slide for this picture: SSP-STP-SCP.ppt
SSP: Service Switching Point
STP: Signal Transfer Point
SCP: Service Control point
Terms/Abbreviations
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PC (Point Code) : Wikipedia page for point code
SS7 Stack
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MTP - Message Transfer Part
SCCP - Signalling Connection and Control Part
ISUP - ISDN User Part
TUP - Telephone User Part
TCAP -Transaction Capabilities
MAP - Mobile Application Part
INAP - Intelligent Network Application Part
Power point slide of this picture: SS7-stack.ppt
MTP Layer
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FISU - Fill In Signal Unit
LSSU - Link Status Signal Unit
MSU - Message Signal Unit
Flag - 01111110 - Separates two message units.BSN - Backward Sequence Number
BIB - Backward Indicator Bit
FSN - Forward Sequence Number
FIB - Forward Indicator Bit
The value of the LI (Length Indicator) field determines the signal unit type.
SIO - Service Information Octet
SIF - Signaling Information Field
Power point slide of this figure: FISU-LSSU-MSU.ppt
The FISU is sent when no other signal units are available.
The LSSU is used by the signalling link level to bring the link into alignment.
The MSU carries the actual upper-level information. For example, if ISDN User Part (ISUP) information is to be sent, it will be carried in an MSU.
Service Switching Point (SSP)
Signal Transfer Point (STP)
Service Control Points (SCP)
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