Nortel Networks DCT1900 - Manual (Page 33)

Technical Product Manual - DCT1900
System Description, System Overview
System-DCT1900/R8/mw 2-11
© 2000-2005
Voluntary Intra System Handover
If the best bearer of another Base Station is at least 6dB or better during a number of consecutive
frames, the Portable Telephone will start a handover to that Base Station.
Voluntary Inter System Handover
For handovers, only REs with the RE status ALLOWED and TEMP_NOT_ALLOWED are
considered as alternatives:
z The RE status of the other RE is equal to the RE status of the current RE. If the best bearer of
a Base Station of another RE is at least 12dB or better during a number of consecutive frames
and there is a bearer free on this Base Station, an inter RE handover will be started.
z The system status of the other system is lower than the system status of the current system. If,
during a number of consecutive frames, the RE status of the other RE is lower than the RE
status of the current RE, and the best bearer of a Base Station of the other RE is at least 12dB
better and of the current RE no other Base Station is detected and the current Base Station
has no other bearers available, then a location update will be started.
Forced Intra System Handover
If the quality of the traffic bearer becomes unacceptably bad, an immediate attempt to find a
different bearer is started. This may result in a handover.
Forced Inter System Handover
If a good bearer cannot be found within the current RE, alternative systems will be investigated in
the history list. If no RE is found, the Portable Telephone quickly scans its environment to find a
valid bearer. If a bearer is found and the network has not yet cleared the call, the Portable
Telephone continues to scan its environment. If the network has cleared the call, e.g. because the
search took too long, the Portable Telephone will release the call.
2.3 User Functions
The user functions are depending on type of interface between the RE and the connected
Telephone Network, and the features supported by the connected Telephone Network.
2.3.1 DCT1900 Mobility Configuration and E1-CAS Standalone when
connected to a MD110
Calling Party Number (ID)
Calling party number is the extension number shown to the user on a Portable Telephone display
upon receipt of an incoming call and used to identify who is calling. The maximum length equals
24 digits.
Connected Party Number
This feature will enable the PBX to inform the user of the party to which it is connected. The
maximum length is 24 digits. The message can be expected at outgoing call set–up or whenever
the other party changes.
Redirecting Party Number
The same as connected party number, except that it will only be sent when the call is diverted
towards another extension. The maximum length is 24 digits.