Medium Access Control (MAC) and Physical Layer (PHY) - CISE

4-June-07 P1901_PRO_016_r0
¡Error! No se encuentra el origen de la referencia. for more information on the Port Solver protocol. If
this field is equal 0, the destination node is the Master node.
- Info Size – 1 bit. This field indicates the size of the Session Id and Validity fields. If it is set to 0, the size of
the SessionId equals 5 bits and Validity equals 6 bits. In that case, the Distributor Token carries information
for 5 destination nodes. If it is set to 1, the size of SessionId and Validity equal 8 bits. In that case, this token
carries only information for 4 destination nodes. Master will use this subtype of Distributor token if it has
more than 32 opened sessions.
- Validityx – (6x5 bits) or (8x4 bits). Channel time assigned for each of the nodes on the distribution list. This
is the maximum channel time the DstPortx can use before send the token to the next node on the list. This
value is indicated in multiples of 8 symbols.
- SessionIdx – (5x5 bits) or (8x4). This value indicates the flow from which the DstPortx is allowed
transmitting.
- Recovery Mode – 1 bit. Indicates the token loss recovery mode selected by the Master. See section X. It
indicates if the in charged of recovering a token loss is the Distributor Token sender (if set to 0) or each of
the nodes on the distribution list (if set to 1).
- Sequence Number – 3 bits. Identifier of the current Distributor Token.
- Disruption Token – 1 bit. This bit informs to the destination nodes of the Distributor token that the
transmitter node is the new QC of the network and it wants to become the master of them.
- Silence Mode – 1bit. Transmitter node indicates it is going to enter in intermittent transmission.
Following diagrams shows the Distributor Token structure if Info Size = 0;
Submission page 113 UPA-OPERA