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

4-June-07 P1901_PRO_016_r0
The transmitter can send bursts to up to 119 ports. The correct range of Local Port is the following:
- From 9 to 126 are possible Local Ports.
- Port 127 is the Broadcast Port. All receivers have to receive the burst with Transmission Port equal to 127.
The Port Solver Table has 118 entries and each entry has the following information:
- MAC address of all transmitters that are visible for this node. The MAC address of the transmitter can be
read in the received Token Announce
- First Remote Port (RP1). The RP1 will be set to a default invalid value (0xFF) until the Port Solver Protocol
takes place. The RP1 of transmitters that do not transmit data directly to this node (for instance, the RP1 of
a CPE for another CPE) will keep the default value. This RP1 is intended to be used fro unicast
communications.
- Second Remote Port (RP2). The RP2 will be set to a default value (0xFF) until a Multicast message of the
Port Solver Protocol containing the Local Port using by the multicast flow transmitter is received.(See
9.1.4.3.2)
- Local Port (LP)
The Port Solver Table will have therefore completed entries (with a valid RP1) and incomplete entries (with a RP1
equal to 0xFF). The RP2 is not taken into account to decide if an entry is completed or not. When receiving from a
MAC address with a completed entry in the Port Solver Table, the receiver shall decode any burst with
Transmission Port field in the burst header equal to:
- The First Remote Port associated to this MAC address
- The Broadcast Port.
If RP2 is also completed in the entry, the receiver shall decode also any burst with Transmission Port in the burst
header equal to:
- The Second Remote Port associated to this MAC address
When First Remote Port is using Mode ACK, the next sent ACK has ACK Port equal to Local Port.
Second Remote Port does not support ACK mode.
Port Solver Table entries are deleted if no TA is received from the corresponding MAC address during 60 seconds
(ageing).
9.1.4.1.1 Unicast Communication example
The following example is useful to understand the meaning of each field in the case of unicast communication
between two nodes:
Submission page 203 UPA-OPERA