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Event structure: native BOP-SS7
The SS7 events are generated by the analysis process from the SL or DL
link when the data structure is based on HDLC frame used by SS7 Protocol.
The SS7 protocol uses the HDLC frame envelope (flag delimitation, CRC,..) but
the fill-in between frames of HDLC is done by the continuous transmission of
fill-in or status frames.
SS7 analysis process of Clarinet includes the following functions::
- a SS7 event is generated for each:
- MESSAGE semaphore frame
- frame following more than 1 flag
- errored frame (CRC, abort, ...)
- STATE semaphore frame if data has changed
- FILLING frame if data has changed
- counting of the fill-in (FISU/TSR) and status (LSSU/TSE) frames with the
same data, and following no more than1 flag.
The binary event structure is defined in the Clarinet-API.
Clarinet Event-Editor: native BOP display
The edition of the BOP-SS7 events without any decoding/formatting allows to
display the contents of the different basic fields related to HDLC frame
envelope:
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Event information |
Date |
Date of the event (end of BOP frame) in
the format: hh:mm:ss/xxx.y |
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| 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
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| Dx |
The decoding level as specified in the
filter (protocol stack). |
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Protocol fields |
BOP |
<BOP type> <flag
counter> [nnnn] |
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Data field |
Field of the conveyed data,
displayed in hexadecimal. |
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<BOP type>
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- Frame: Valid frame with correct CRC calculation result.
- Beginning of Idle state (1 permanent).
- End of Idle state (1 permanent).
- Abort frame.
- Crc error: Frame with false CRC calculation result.
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<flag_counter>
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If normal frame, the number of flags from
the previous BOP event on the same direction. |
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[nnnn]
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If normal frame, the number of octets of
the information field. The length does not include the
2-octet CRC. |
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