Unformatted text preview: 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 126.96.36.199.2 Semantics The VC_FSH.indication primitive shall provide parameters as follows:
VC_FSH.indication 188.8.131.52.3 (FSH_SDU,
FSH_SDU Loss Flag (optional)) When Generated The VC_FSH.indication primitive shall be passed from the service provider to the VC_FSH
Service user at the receiving end to deliver an FSH_SDU.
184.108.40.206.4 Effect On Receipt The effect of receipt of the VC_FSH.indication primitive by the VC_FSH Service user is
220.127.116.11.5 Additional Comments
The VC_FSH.indication primitive shall be used to deliver FSH_SDUs to the VC_FSH
Service user identified by the GVCID.
3.6 VIRTUAL CHANNEL OPERATIONAL CONTROL FIELD (VC_OCF)
SERVICE 3.6.1 OVERVIEW OF VC_OCF SERVICE
The Virtual Channel Operational Control Field (VC_OCF) Service provides synchronous
transfer of fixed-length data units, each consisting of four octets, in the Operational Control
Field (OCF) of Transfer Frames of a Virtual Channel. The service is unidirectional and
sequence-preserving. The transfer is synchronized with the release of Transfer Frames of a
Virtual Channel. 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. CCSDS 132.0-B-1 Page 3-12 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 3.6.2 VC_OCF SERVICE PARAMETERS
18.104.22.168 General The parameters used by the VC_OCF Service primitives shall conform to the specifications
contained in 22.214.171.124 through 126.96.36.199.
188.8.131.52 OCF_SDU NOTE – The OCF_SDU parameter is the service data unit transferred by the VC_OCF
Service in the Operational Control Field of Transfer Frames of a Virtual Channel.
For restrictions on the OCF_SDU transferred by the VC_OCF Service, see 3.2.5.
184.108.40.206 GVCID The GVCID parameter shall contain a GVCID that indi...
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