Provided are a system and method for transferring management channel information over a synchronous optical network. Each of the receiving circuits is coupled to the driving circuit consecutively via a transmission line. A rate of cooling the molten metal in the feeder head is lower than that in the cavity. The MAG construct enables multiple threads to be associated with the same node without any foreknowledge of which threads will be involved in the association, and without any control over the particular node with which they are associated. The particular policy set may include an instruction used to process a data flow provided to or provided from the client device. It permits to obtain a box that can be mounted by itself.