User's Manual Part 1

3: Detailed Description
APCD-LM043-8.0 (DRAFT C) 25
3. If the grade of service is not DENIED, the CCU adds the EUM to the Registration
Table, described in Registration Table (CCU only) on page 240 and sends a
Registration Response message to the EUM. Data communications are then enabled.
However, if the Registration Table on the CCU is already full, the CCU treats it as
DENIED.
4. If the grade of service is DENIED, the CCU sends a Deregistration Request to the
EUM and data communications are disabled. The EUM continues to send
Registration Requests to the CCU approximately every 10 minutes, starting again at
step 1.
5. If RADIUS authorization is enabled and there is no entry for the EUM in the
Authorization Table, the CCU queries the RADIUS server for the EUM's grade of
service. When the RADIUS server responds, an entry is made in the Authorization
Table. The Registration Table and the grade of service offered to the EUM are then
updated. An Access Accept message contains one of the non-DENIED grades of
service, while an Access Reject message is equivalent to a DENIED grade of service.
6. If the previous grade of service was not DENIED and an Access Reject is received,
the EUM is de-registered immediately, removed from the Registration Table, and data
communication is disabled.
7. If the previous grade of service was DENIED and an Access Accept is received, the
EUM is directed to attempt registration again immediately, which will be successful
due to the new entry in the Authorization Table.
8. On a periodic basis, for each Authorization Table entry created by a RADIUS
response, the CCU queries the RADIUS server for the EUM's grade of service. If the
response is different from the previous response, the Authorization Table,
Registration Table and grade of service offered to the EUM are updated. If the
RADIUS server does not respond over the course of three query periods, the EUM
reverts to the default grade of service.
9. If at some later time, the EUM does not respond to messages from the CCU, the CCU
sends a Deregistration Request to the EUM and removes the EUM from the
Registration Table. The EUM must then repeat the registration process to obtain
access.
10. If there has been no traffic to or from the EUM for more than 12 hours, the CCU
removes the EUM from the Registration Table without sending a Deregistration
Request. The EUM must then repeat the registration process to obtain access.
NOTE: If a RADIUS-authorized EUM power cycles, the EUM re-registers
using the existing entry in the Authorization Table, without
generating an immediate RADIUS query.
NOTE: An authorization entry made through the CLI is marked as “static”
and is not updated through RADIUS.