Link Capacity Adjustment Scheme (LCAS) is a protocol to provide hitless bandwidth adjustment of virtual concatenated (VCAT) signal under the control of network management system (NMS). It has much larger flexibility to dynamically assign resources and becomes an important feature for multi-service transport platform (MSTP) systems. However, the scheme is a two-way handshake signalling with status messages exchanged continuously, which can hardly be implemented within a single chip. Aiming at an easier implementation in ASIC, we revise the LCAS protocol to have a shorter handshaking procedure by adding MST bits in the reserved K4 bits and remove the complex mappings between TU12s and theirs SQs. Simulation results show that the revised LCAS shortens the period of handshaking procedure and synthesis results show that the size of logic is greatly reduced. We believe the new scheme will be accepted and applied in future.
Resilient packet ring (RPR) is a good capacity solution to next generation metropolitan area network (MAN). This paper introduces the back end design of RPR application specific integrated circuit (ASIC) designed independently by Department of Electronic Engineering of Tsinghua University. It draws a back end design flow chart and relates about three key techniques: simultaneous switching output (SSO), design for testability (DFT) and static timing analysis (STA). It makes a brief introduction to each technique. It discusses the ways to avoid SSO problems, to calculate scan chains number, to achieve qualified test pattern fault coverage, and to solve STA violations. In the end, it shows design results and layout figure.
The present paper reports the effect of hyperthermia (HT) induced by Nd:YAG laser and photodynamic therapy (PDT) by AR+ laser radiation in combination on the transplanted sarcoma 180 in CM mice. Tumor-bearing mice were divided into four groups: A) control group, B) HT group, C) PDT group and D) PDT followed by HT group. HT was induced by Nd:YAG laser radiation and the temperature at tumor edge was control at 43 degrees C for 30 minutes. Tumor-bearing mice of group C and D were given an i.p. injection of HpD 24 hours prior to AR+ laser radiation. The experiments show significant increases in inhibition rates against the S-180 in CM mice by the HT and PDT combination, compared to those by either HT or PDT alone. With that of Group D being the lowest, the DNA contents of tumor cells in the four groups are of statistical significance too. These results suggest the combination of HT induced by Nd:YAG and PDT by Ar+ laser radiation may become a new method of tumor treatment.