User's Manual Part 1

28 APCD-LM043-8.0 (DRAFT C)
3: Detailed Description
7. The packet is then transmitted through the Polling MAC and radio interface to the
EUM.
8. The EUM receives the packet through the EUM radio port and checks the port
number. If the port number appears in the EUM Port Filter Table, the packet is
discarded.
9. If the path to the destination is through the CCU radio port, then the CCU obtains the
destination Ethernet MAC address from the ARP Table, described in ARP Table (CCU
and EUM) on page 236. If the destination is not listed in the ARP Table, the CCU
obtains its MAC address by issuing an ARP query. Once it receives the MAC address,
it adds the entry to the ARP Table.
10. If the port number does not appear in the EUM Port Filter Table, the EUM checks the
destination MAC address. If the MAC address is the EUM MAC address, then the
packet is forwarded to the EUM application; otherwise, the packet is sent out through
the Ethernet port to the end user’s equipment.
3.3.5 End-user Computer to Internet Data Transmission using Switched
Ethernet Mode
1. The EUM receives packets from the end-user’s equipment through the Ethernet port.
2. The EUM checks the port number. If the port is listed in the EUM Port Filter Table, the
packet is discarded.
3. If it is not already in the list, the EUM adds the source Ethernet address to the Bridge
Table, described in Bridge Table (EUM or CCU in Switched Ethernet or Through Only
Mode) on page 242. The EUM determines whether or not the source is entitled to air
access, based on the Bridge Table.
4. If the source is not entitled to air access, the packet is discarded.
5. The EUM checks the destination MAC address. If the destination MAC address
appears in the Bridge Table, meaning the destination is on the Ethernet side, the
packet is discarded.
6. If the destination MAC address is the same as the EUM MAC address, then the
packet is forwarded to the EUM application; otherwise, it is forwarded through the
polling MAC and radio link to the CCU.
7. The CCU receives the packet through the CCU radio port. The CCU either updates or
adds the Ethernet address to the Address Table.
8. The CCU checks the port number. If the port number appears in the CCU Port Filter
Table, the packet is discarded.
9. The CCU checks the destination MAC address. If the destination MAC address is in
the Address Table, the packet is sent to the associated EUM.
10. If the destination MAC address is the same as either the CCU radio or Ethernet MAC
address, the packet is forwarded to the CCU application.
11. The CCU checks whether the destination MAC address is in the bridging table. If it is,
the packet is transmitted out the Ethernet port; otherwise, the packet is broadcast out
the radio and sent out the Ethernet port.