The service is unidirectional either asynchronous or

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Unformatted text preview: length, along with status fields, across a space link. The service is unidirectional, either asynchronous or periodic, and sequence-preserving. The service does not guarantee completeness but may signal gaps in the sequence of service data units delivered to the receiving user. 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. 2.2.3.4 Virtual Channel Frame Secondary Header (VC_FSH) Service The Virtual Channel Frame Secondary Header (VC_FSH) Service provides synchronous transfer of fixed-length data units in the Transfer Frame Secondary Header (FSH) 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 may signal gaps in the sequence of service data units delivered to the receiving user. 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. 2.2.3.5 Virtual Channel Operational Control Field (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. 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 n...
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