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

4-June-07 P1901_PRO_016_r0
If the node is the first modem in the network and connected directly through the Ethernet port to the backbone, the
process is slightly different:
1. This node starts with the same default factory configuration: Access CPE.
2. Using DHCP protocol, the node gets their IP configuration (IP address, netmask and gateway, and the name
of their corresponding auto-configuration file). Also there is another parameter called pttp-code that indicates if
VLAN is used and the value of the management VLAN if needed. Once this parameter is obtained the PTTP
protocol finishes. Important: the DHCP server must ask this node in the VLAN #1 or without VLAN. In other
words, the node performs DHCP requests without VLAN and with VLAN #1 alternately.
3. Using TFTP protocol, the nodes download the auto-configuration file and configure the node accordingly.
The figure below shows an example of this case:
Radius Server
TFTP Server
DHCP Server
Ethernet
12.2.3 Access Protocol
DHCP
Request
VLAN 1
Slave
DHCP
DHCP
Reply
VLAN 1
Slave
Gets Mgmt VLAN from
DHCP reply
Gets IP address +
Name of Configuration
File
TFTP
Request
VLAN X
Submission page 360 UPA-OPERA
Slave
TFTP
Reply
VLAN X
Downloads Configuration
File + Translation Table
Figure 152 Autoconfiguration of a HE
HE
HE Node Configured
as master
The access protocol mechanism controls the access of slaves to the BPL network. The master or repeater queries the
Radius server (if Radius authentication is enabled) when a new slave is detected.
Only nodes that link to a Master or repeater need to be in the Radius database:
• CPEs