October 2002
Intermediate to advanced
1280 pages
24h 35m
English
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Every Packet Contains a BTH
Refer to Figure 1-4 on this page and Figure 1-5 on this page. In addition to the LRH and, possibly, the GRH, every packet contains a Base Transport Header (BTH). Among other things, the BTH contains:
The Opcode field identifies the type of request or response packet.
The DestQP field identifies the destination QP within the remote CA. The destination QP is responsible for handling the incoming packet. QPs are described in the chapter entitled, “QP: Message Transfer Mechanism” on page 31.
The PSN field contains the packet's 24-bit Packet Sequence Number. The PSN is inserted into a transfer request packet by the initiator and is checked for correctness by the recipient. This permits the recipient to detect missing packets. ...
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