Unformatted text preview: ot multiplexed together within one Virtual Channel.
220.127.116.11 Virtual Channel Frame (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. CCSDS 132.0-B-1 Page 2-8 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL For a given service instance 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.
The Virtual Channel Frame Service transfers the independently created TM Transfer Frames
through a space link, together with TM Transfer Frames created by the service provider
itself. This service is made available to trusted users who are certified during the design
process to ensure that the independently created protocol data units do not violate the
operational integrity of the space link. Necessarily, the independent Transfer Frames must
have the same length as those generated by the service provider.
18.104.22.168 Master Channel Frame Secondary Header (MC_FSH) Service The Master Channel Frame Secondary Header (MC_FSH) Service provides synchronous
transfer of fixed-length data units in the Transfer Frame Secondary Header (FSH) of Transfer
Frames of a Master Channel. The service is unidirectional and sequence-preserving. The
transfer is synchronized with the release of Transfer Frames of a Master Channel. The
service does not guarantee completeness, but may signal gaps in the sequence of service data
units delivered to a receiving user.
Only one user can use this service on a Master Channel, and the user is identified with the
MCID of the Master Channel. Service data units from different users are not multi...
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This document was uploaded on 03/06/2014.
- Spring '14