Method and arrangement for enhancing the handling of TTI identifier
AssigneeNokia Corporation
InventorTuomo Sihvola
Life of this patent
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Abstract
The invention relates to a method for finding frame alignment and accepting and monitoring TTI identifiers contained in frames in an SDH system. Advantageously the method according to the invention comprises steps in which frame alignment is first sought for by means of a frame alignment signal. When frame alignment has been found, it is monitored that it stays correct and at the same time at least one TTI identifier is read. According to the invention, at least one TTI identifier is saved from a frame after the finding of frame alignment. If a loss of frame alignment is detected, the TTI identifier saved is stored for a predetermined time. The invention further relates to an arrangement comprising means to implement the method described above in an SDH system.
Claims20
A method for determining frame alignment and accepting and monitoring address information bytes contained in frames in a synchronous digital hierarchy or synchronous optical network system, comprising the steps of:
- finding a frame alignment using a frame alignment signal;
- monitoring the frame alignment after the frame alignment is found;
- reading at least one address information byte from a frame after the frame alignment is found;
- saving the at least one address information byte;
- and
- maintaining the saved at least one address information byte for a predetermined time after loss of the frame alignment is detected.
An arrangement for determining a frame alignment and accepting and monitoring address information contained in frames in a synchronous digital hierarchy or synchronous optical network system, comprising:
- means for finding a frame alignment using a frame alignment signal;
- means for monitoring a correctness of the frame alignment after the frame alignment is found;
- means for reading at least one address information byte from a frame after the frame alignment is found;
- means for saving the at least one address information byte;
- and
- means for maintaining the saved at least one address information byte for a predetermined time after a loss of the frame alignment is detected.
Dependencies are inferred from the claim text.