User's Manual

3 Detailed Description
48 APCD-LM043-4.0
the call may be affected as other users become associated, increasing the polling interval
beyond 20 ms. Since the grade of service applies to an EUM and not to an individual service,
a VoIP user would have to be given a very high grade of service, to the possible detriment of
other end users.
3.6 CCU and EUM Feature Description
3.6.1 DHCP Relay
IP address information for CCUs and EUMs are manually entered. In the case of end-user
PCs, IP addresses can be entered manually or obtained automatically from a DHCP server, if
CCU DHCP relay is enabled.
Once DHCP Relay is enabled in the CCU, DHCP requests from the end-user’s computer pass
transparently through the CCU and EUM to the operator’s DHCP server. Since the IP address
assigned to the end-user’s computer must be on the same subnet as the CCU radio port, the
operator needs to preassign an appropriate block of IP addresses in the DHCP server.
TIP: It is helpful to assign meaningful names, such as the
customer name, to customer computers or home network
routers. Then, if a DHCP server is implemented, the address
leases pool includes this name with the client IP address,
facilitating easier identification.