摘要:
A selector bank subsystem (SBS) of a code division multiple access (CDMA) system is disclosed, including two portions: a SBSC block and a S/V block. The one SBSC block is designed to manage twelve S/V boards so as to provide 96 traffic channels per SBS self, and thus, one S/V board provides eight communication channels. A selector bank subsystem (SBS) of a code division multiple access (CDMA) system, includes: an SBS block, the SBS block being composed of a pair of first processors for controlling the traffic frame communication with a CDMA interconnect subsystem (CIS) by selecting a channel between the CIS and a mobile service switch center (MSC); a dual port RAM (DRAM) for storing the traffic frame by the control of the first processor and being access-controlled by direct memory access controller (DMAC); a second processor for controlling the DMAC; an E1 interface portion for interfacing the frame data with the MSC by receiving synchronism from the TFU of the CPS receiver; and a S/V block being linked between the DRAM and the E1 interface as a plurality of extensible card forms, and for receiving the traffic frame to the E1 interface portion after DSP-processing. Therefore, the subsystem completes the SBS constitution of a mass-production module having competitiveness, avoids a complicated hardware constitution and reduces the possibility of a signal conflict between boards.
摘要:
Provided are a Raman amplifier and a Raman pumping method. A light source unit outputs a pumping light having a wavelength that periodically changes. A light intensity control unit varies a light intensity of the pumping light using the pumping light to improve the gain flatness of a Raman gain. A control unit directs the light intensity control unit to control the light intensity of the pumping light in synchronization with changes in the wavelength of the pumping light.
摘要:
A channel allocation method of channels having different transmission speeds in a wavelength division multiplexing (WDM) system is provided. The channel allocation method in a multirate optical transmission system includes selecting a channel having the lowest transmission speed from not allotted channels, allotting the selected channel to the longest wavelength band of empty wavelength bands, and determining whether not allotted channels exist in order to repeatedly perform selecting the channel having the lowest transmission speed from the not allotted channels and allotting the selected channel to the longest wavelength band of the empty wavelength bands, until all the channels are allotted.
摘要:
A method for connecting to a network from a mobile terminal capable of forming a high-performance radio channel in a Universal Mobile Telecommunication System (UMTS), and an apparatus implementing the same are provided. The method includes transmitting a Radio Resource Control (RRC) connection request message indicating a first release version to the network, receiving an RRC connection setup message indicating a second release version from the network, comparing the first and second release versions, determining whether there is a third release version lower than the first release version and higher than the second release version when the second release version differs from the first, and, if there is the third release version lower than the first release version and higher than the second release version, transmitting an RRC connection request message indicating the third release version to the network when the second release version differs from the first release version.
摘要:
The present invention relates to an apparatus and method for stabilizing a bias voltage for a pulse generating modulator, which can automatically detect an optimal bias voltage for an external modulator, which is used in RZ or CSRZ modulation of an optical transmission signal using NRZ data to generate a reference pulse optical signal, and maintain the optimal bias voltage. In the bias voltage stabilizing method of the present invention, an output signal of the external modulator, to which the bias voltage to be stabilized is applied, is detected, a drive clock signal applied to the external modulator is detected, a mean output value of the products obtained by the multiplication of the output signal and the clock signal is periodically examined, and the bias voltage is adjusted so that the mean output value becomes “0”.
摘要:
Provided are a Raman amplifier and a Raman pumping method. A light source unit outputs a pumping light having a wavelength that periodically changes. A light intensity control unit varies a light intensity of the pumping light using the pumping light to improve the gain flatness of a Raman gain. A control unit directs the light intensity control unit to control the light intensity of the pumping light in synchronization with changes in the wavelength of the pumping light.
摘要:
A method of bypassing vocoders in a digital mobile communication system, comprising the step of appending bypass mode data to data transmitted from a plurality of mobile stations, the bypass mode data instructing the vocoders not to perform encoding/decoding operations, and the step of transmitting the resultant data. According to the present invention, the unnecessary encoding/decoding operations are omitted for a mobile to mobile communication. Therefore, the present invention has the effect of removing the delay time and enhancing the voice quality.
摘要:
An apparatus for reducing power consumption in a digital broadcast receiver is provided. An AC-to-DC converter converts input AC power into DC power that can be used in the receiver. A power control switch selectively supplies the DC power from the converter to a tuner unit and a decoder according to a command of a controller. The tuner unit receives broadcast channel signals and demodulates the received broadcast channel signals according to the respective broadcast formats. The decoder receives the demodulated broadcast signals from the tuner unit and decodes analog/digital broadcast signals. A multimedia output port is connected between the decoder and the display unit to transfer the audio/video output signals from the decoder to the display unit. The controller detects the state of the display unit through the multimedia output port to control whether to supply the DC power through the power control switch.
摘要:
A digital mobile communication system wherein a master clock of a mobile communication system for offering audio or data service using a code division multiple access (CDMA) is set as a global positioning system (GPS) clock provided in a GPS and the interface and timing between various subsystems using the GPS clock and an exchanger are redesigned to achieve an exact timing schedule, and a timing design method between various subsystems. In order to maintain frequency and time synchronization between various subsystems in a CDMA system using an exchanger therefor, the respective subsystems are designed based on the clock supplied from a GPS, a hardware interconnection between the systems is designed based on the GPS clock to attain an exact timing, thereby achieving a fast and exact frame transmission.
摘要:
A method of bypassing vocoders in a digital mobile communication system, comprising the step of appending bypass mode data to data transmitted from a plurality of mobile stations, the bypass mode data instructing the vocoders not to perform encoding/decoding operations, and the step of transmitting the resultant data. According to the present invention, the unnecessary encoding/decoding operations are omitted for a mobile to mobile communication. Therefore, the present invention has the effect of removing the delay time and enhancing the voice quality.