Frame structure:
FISU,
LSSU,
MSU,
+-----+-----+-- Users of SS7---------+
OSI layers | | | | | SS7
| | +---+ +----+ +----+ +----+ levels
| +---+ |MAP| |OMAP| |INAP| |ISUP| |
L7 +---+ | | +-+-+ +-+--+ +-+--+ | |+---+
|HUP| | | +-|-----|------|----------+ |ISDN||TUP| L4 user
| | |MUP| | TC(AP) | |User|| |
| | | | |Transaction Capabilities | |Part||DUP|
| | | | | (Application Part) | | || |
-----| | | | +---------+---------------+ | || |
L4..6| | +-+-+ | | || |
-----| | +-|-------------|------------------+ | || |
L3 | | | SCCP |-+ || |
| | |Signalling Connection Control Part| | || |
+-+-+ +---------------+------------------+ +--+-++-+-+
+-|-------------------|-----------------------|----|-+ -----
| | L3 network
-----| |
L2 | MTP | L2 data link
-----| Message Transfer Part |
L1 +------------------------+---------------------------+ L1 physical
|
+--------> other entities network
- (TUP) Telephone User Part
- (DUP) Data User Part
- HUP Handover User Part (NMT-450)
- MUP Mobile User Part (NMT-450)
Application software modules:
- OMAP Operations, Maintenance and Administration
- INAP Inteligent Network Application Part
- MAP Mobile Application Part
- TCAP Transaction Capabilities Application Part
- BSSAP Base Station System Application Part
- BSSMAP BSS Management Application Part
(Technical Information)