Patent ID: 6600742
Filing Date: 2003-07-29
Classification: H04J,H04L

Abstract:
An SDH transmission unit, comprising:a high speed block for accommodating high speed line signals of a source network based on an SDH transmission system; and a tributary block for accommodating low speed line signals of a tributary network based on an SDH transmission system and having a transmission capacity lower than that of the high speed line signals and interfacing with said high speed block; said tributary block including a plurality of routing blocks each of which accommodates low speed line signals for a predetermined capacity and performing line selection processing for low speed line signals to be interfaced with said high speed block in accordance with a form of said tributary network; at least one of said routing blocks serving, when the low speed line signals accommodated therein do not fully occupy the predetermined capacity, as a master block which accommodates at least one of the other routing blocks as a slave block in order to accommodate the low speed line signals accommodated in the other routing block, wherein each of said master block and said slave block includes a masking processing section for performing masking processing for signal lines which are not used between said master block and said slave block by the line selection processing in accordance with the form of said tributary network.