This paper proposes BER evaluation system that evaluates BER of TLC and QLC NAND flash memories with reliability information such as write and erase (W/E) cycle and data-retention time by combining SSD model emulator and device characteristics of NAND flash memories. Proposed system decides which ECC type should be used in TLC and QLC NAND flash in SCM/TLC/QLC NAND flash tri-hybrid SSD, corresponding to various applications and memory capacity ratio. For hm_0 (write- cold application), BCH ECC is enough to correct bit errors in TLC NAND flash. On the other hand, for prxy_0 (write-hot application), LDPC ECC must be applied to TLC NAND flash in case of small SCM capacity, large W/E cycles and high BER in TLC NAND flash. In contrast, this paper concludes that QLC NAND flash needs LDPC ECC regardless of application and memory capacity.

This paper describes a new integrated service network using packetized voice/data technology which was developed in consideration of the sophisticated service demands for voice, data, and facsimile communication. A major problem in constructing this network is in the local distribution network, i.e., the subscriber interface unit, the local end office, and the subscriber loop which connects them. The concepts, choice of design parameters, and laboratory test results of the packetized service integration network are briefly discussed.