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NATO UNCLASSIFIED STANAG 5066: PROFILE FOR MARITIME HF DATA COMMUNICATION V1.0.2 Reason Value Not Enough Resources 1 Invalid SAP ID 2 SAP ID already allocated 3 Name : S_UNBIND_INDICATION ( ) Arguments : 1. Reason Direction : Subnetwork Interface->Client Description : This primitive is issued by the Subnetwork Interface Sublayer to unilaterally declare a client as off-line. If the client wants to come on-line again, it must issue a new a S_BIND_REQUEST primitive. The S_UNBIND_INDICATION primitive provides a means for the Subnetwork Interface Sublayer to manage the clients connected to it. As an example, if a new “High Ranked” client requests to come on-line but not enough resources are available, the Subnetwork Interface Sublayer may decide to unilaterally declare a “Lower Ranked” client off-line in order to release resources for the Higher-Ranked client. The Reason argument explains why the client was declared off-line. The binary representation of the value in the table shall be mapped into the Reason field of the primitive by placing the LSB of the value into the LSB of the field. Reason Connection pre-empted by higher ranked client Inactivity (failure to respond to “Keep alive”) Too many invalid primitives Too many expedited data request primitives Value 1 2 3 4 Name : S_UNIDATA_REQUEST Arguments : 1. Destination Node Address 2. Destination SAP ID 3. Priority 4. TimeToLive (TTL) 5. Delivery Mode 6. U_PDU (User Protocol Data Unit) Direction : Client->Subnet Interface Description : This primitive is used by connected clients to submit a U_PDU to the HF subnetwork for delivery to a receiving client. The argument Destination Node Address specifies the address of the physical HF node to which the receiving client is bound. The argument Destination SAP ID specifies the SAP ID of the receiving client and NATO UNCLASSIFIED 6
NATO UNCLASSIFIED STANAG 5066: PROFILE FOR MARITIME HF DATA COMMUNICATION V1.0.2 distinguishes it from the other clients bound to the destination node. The argument Priority represents the priority of the U_PDU. The U_PDU priority can take a value in the range 0-15. The node shall make a “best effort” to give precedence to high priority U_PDUs over lower priority U_PDUs which are queued in the system. The argument TimeToLive (TTL) specifies the maximum amount of time the submitted U_PDU is allowed to stay in the HF Subnetwork before it is delivered to its final destination. If the TTL is exceeded the U_PDU shall be discarded. A TTL value of 0 is defined to mean infinite TTL, i.e. the subnetwork should try forever to deliver the U_PDU. The subnetwork should have a default maximum TTL which will normally be a very large value. As soon as the Subnetwork Interface Sublayer accepts a S_UNIDATA_REQUEST primitive, it immediately calculates its TimeToDie (TTD) by adding the specified TTL (or the default maximum value if the specified TTL is equal to 0) to the current Time of Day, e.g. GMT. The TTD attribute of a U_PDU accompanies it during its trip within the subnetwork. It should be noted that the TTD is an absolute time while the TTL is a time interval relative to the instant of the U_PDU submission. The argument Delivery Mode is a complex argument and has a number of attributes. This argument can be given the value of “Default” which means that the delivery mode associated with the U_PDU will be the delivery mode specified by the client during “binding” (Service Type argument of S_BIND_REQUEST). The other values of the Delivery Mode can be used to override the default delivery mode for this U_PDU. A detailed discussion of this argument is provided at the end of this section. The final argument, U_PDU, is the actual Data Unit submitted by the client to the HF Subnetwork. Name : S_UNIDATA_REQUEST_CONFIRM Arguments : 1. Destination Node Address 2. Destination SAP ID 3. U_PDU (User Protocol Data Unit or part of it) Direction : Subnetwork Interface->Client Description : This primitive is issued by the Subnetwork Interface Sublayer to acknowledge the successful delivery of a S_UNIDATA_REQUEST submitted by the client. This primitive is issued only if the client has requested Data Delivery Confirmation (either during binding or for this particular data unit). The three arguments of this primitive are copies of the corresponding arguments of the S_UNIDATA_REQUEST which caused the S_UNIDATA_REQUEST_CONFIRM. Using these arguments, the client should be able to uniquely identify the U_PDU which is being acknowledged. Depending on the implementation, the last argument, U_PDU, may not be a complete copy of the original U_PDU but only a partial copy, e.g. only the first x bytes are copied. If a partial U_PDU is returned, the first x bytes shall be returned so that the client will have the U_PDU segment information. Name : S_UNIDATA_REQUEST_REJECTED Arguments : 1. Reason 2. Destination Node Address 3. Destination SAP ID 4. U_PDU (User Protocol Data Unit or part of it) Direction : NATO UNCLASSIFIED 7
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