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

4-June-07 P1901_PRO_016_r0
c) Local Port: Local Port assigned by the ABLP_ack packet transmitter to the link with the ABLP_ack packet
destination node.
d) Sequence Number: acknowledged ABLP_inf packet sequence number.
e) Dest MAC: destination node MAC address.
9.1.3 Access Protocol
Access protocol defines a protocol for connecting nodes in point-multipoint BPL networks within master-slave
architecture.
In this protocol we will define the way to establish a connection from a slave to a master of the network.
Each master node may periodically send an access frame, as explained in 4.3.5, to the network, and wait for a
response to add the responding slave to their own list and then start the AAA (Authorization – Authentication –
Accounting) protocol to decide if the node is authorized to connect to the network via this master or not.
On the other side, when a slave receives an access token it decides to reply or not with an access reply frame, as
explained in 4.3.9.
When a slave wants to send an access reply frame it must start a back-off period, as it is explained in 4.3.9. If no
other access reply frame is detected during that period, the node may send an access reply frame.
Once a master receives an access reply frame from a slave it must send an access protocol packet accepting or
rejecting the slave.
9.1.3.1 Access Protocol packet format
This packet shall be sent from the master to a slave that sent and access reply frame, to indicate if the slave is
accepted or not. The packet is formatted as an CCP packet and the structure is shown in Figure 75.
The response contained in the packet can be of three different types:
• ACCEPT: The slave node has been accepted
• REJECT: The slave node has been rejected because the AAA process has resulted in rejection.
• FAILED: The slave node has been rejected because the AAA process has failed and the master does
not have enough information to accept or reject the node.
The packet uses the CCP with Type0=0x03 and Type1=0x01.
Submission page 197 UPA-OPERA