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OCF_SDU Loss Flag (optional)) CCSDS 132.0-B-1 Page 3-14 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 184.108.40.206.3 When Generated The VC_OCF.indication primitive shall be passed from the service provider to the VC_OCF
Service user at the receiving end to deliver an OCF_SDU.
220.127.116.11.4 Effect On Receipt The effect of receipt of the VC_OCF.indication primitive by the VC_OCF Service user is
18.104.22.168.5 Additional Comments
The VC_OCF.indication primitive shall be used to deliver OCF_SDUs to the VC_OCF
Service user identified by the GVCID.
3.7 VIRTUAL CHANNEL FRAME (VCF) SERVICE 3.7.1 OVERVIEW OF VCF SERVICE
The Virtual Channel Frame (VCF) Service provides transfer of a sequence of fixed-length
TM Transfer Frames of a Virtual Channel, created by an independent protocol entity, across
a space link. The service is unidirectional, either asynchronous or periodic, and sequencepreserving. The service does not guarantee completeness, but it may signal gaps in the
sequence of service data units delivered to the receiving user.
Only one user, identified with the GVCID of the Virtual Channel, can use this service on a
Virtual Channel. Service data units from different users are not multiplexed together within
one Virtual Channel.
3.7.2 VCF SERVICE PARAMETERS
22.214.171.124 General The parameters used by the VCF Service primitives shall conform to the specifications
contained in subsections 126.96.36.199 through 188.8.131.52.
184.108.40.206 Frame The Frame parameter shall be a TM Transfer Frame of the Virtual Channel specified by the
1 The Frame parameter is the service data unit transferred by the VCF Service. CCSDS 132.0-B-1 Page 3-15 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 2 The format of the GVCID parameter is defined in 4.1. 3 For restrictions on the TM Transfer Frames transferred by the VCF Service, see 3.2.6. 220.127.116.11 GVCID The GVCID parameter shall contain a GVCID that indicates the Virtual Channel th...
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- Spring '14
- Space Exploration, European Space Agency, Protocol data unit