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NATO UNCLASSIFIED<br />
STANAG 5066: PROFILE FOR MARITIME HF DATA COMMUNICATION<br />
V1.0.2<br />
HARD LINK TYPE 0 HARD LINK TYPE 1 HARD LINK TYPE 2<br />
REQUESTING<br />
CLIENT<br />
OTHER CLIENTS<br />
REQUESTING<br />
CLIENT<br />
OTHER CLIENTS<br />
REQUESTING<br />
CLIENT<br />
OTHER CLIENTS<br />
SUBNETWORK<br />
SUBNETWORK<br />
SUBNETWORK<br />
SUBNETWORK<br />
SUBNETWORK<br />
SUBNETWORK<br />
CLIENTS<br />
CLIENTS<br />
SPECIFIED<br />
CLIENT<br />
OTHER CLIENTS<br />
Figure A-2: Hard Link Types<br />
It is emphasised th<strong>at</strong> the multiple communic<strong>at</strong>ion p<strong>at</strong>hs th<strong>at</strong> are shown in the above Figure<br />
are multiplexed over the same physical link between the nodes.<br />
A.3 Peer-to-Peer Communic<strong>at</strong>ion Protocols and S_PDUs<br />
Peer Subnetwork Interface Sublayers (generally in different nodes) communic<strong>at</strong>e with each<br />
other by exchanging Subnetwork Interface Sublayer Protocol D<strong>at</strong>a Units (S_PDUs). For the<br />
Subnetwork configur<strong>at</strong>ions currently defined, Peer-to-Peer Communic<strong>at</strong>ion is required for:<br />
1. Establishment and Termin<strong>at</strong>ion of Hard Link D<strong>at</strong>a Exchange Sessions<br />
2. Exchange of Client D<strong>at</strong>a<br />
Explicit Peer-to-Peer communic<strong>at</strong>ion is not required for the establishment or termin<strong>at</strong>ion of<br />
Soft Link or Broadcast D<strong>at</strong>a Exchange sessions. The Peer-to-Peer communic<strong>at</strong>ion required<br />
for the exchange of Client D<strong>at</strong>a is similar for all D<strong>at</strong>a exchange sessions. The encoding of the<br />
S_PDUs and the protocol governing the Peer-to-Peer Communic<strong>at</strong>ion are described in the<br />
following sections.<br />
A.3.1<br />
Subnetwork Interface Sublayer Protocol D<strong>at</strong>a Units (S_PDUS)<br />
There are currently seven types of S_PDUs. Additional S_PDU types may be defined in the<br />
future. The generic encoding of the seven S_PDU types showing the fields and subfileds of<br />
the S_PDUs is shown in Figure A-3.<br />
NATO UNCLASSIFIED<br />
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