Ericsson RBS 2106 Reference Manual page 344

Functionality Administration
The BSC is informed of the successful disable of the AO or, if
unsuccessful, an indication of why the disable was unsuccessful is
returned.
43.3.3 A-bis OML Support
Layer 3 downlink Elementary Procedures
Downlink EPs are those EPs initiated by the BSC. The initiating
message is checked for the following criteria:
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An initial message that fails to meet any of these criteria is rejected. If
the message is so badly corrupted that it is not recognisable, the
message is simply ignored.
A message which meets all of these criteria is forwarded to the
appropriate handling function. The handling function is then responsible
for responding to the initial message.
Layer 3 downlink Precondition Test
This is a general function which is implicitly used by all functions
initiated on the Abis O&M interface. It is performed after the general
Format Check. The function must not be explicitly refered to.
Layer 3 uplink Elementary Procedures
Uplink EPs are those EPs initiated by the RBS. All functions within the
RBS which initiate uplink EPs use this function to provide supervision
as defined below.
An initiated EP is time supervised. The initial message of an EP is
repeated if timeout occurs before a response is received. The initial
message is sent once, and then repeated a maximum of two times.
The response from the BSC is checked for the following criteria:
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A response message that fails to meet any of these criteria is simply
ignored.
A response message that meets all of these criteria is forwarded to the
function that initiated the EP.
342 (485)
Valid header and message code
Correct length
All mandatory parameters are present
Only mandatory or optional parameters are present
Parameter values are in range
Valid header and message code
Correct length
All mandatory parameters are present
Only mandatory or optional parameters are present
Parameter values are in range
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2001-11-28