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A process for reducing the amount of overhead data in ATM cell headers prior to transmission both upstream and downstream on an HFC cable plant or other transmission media using SCDMA on at least the upstream path, without loss of either IP or Ethernet addressing information. A process for reducing the amount of overhead data in ATM cell headers prior to transmission both upstream and downstream on an HFC cable plant or other transmission media using SCDMA on at least the upstream path, without loss of either IP or Ethernet addressing information.
The apparatus of claim 10 wherein said transmitter is a QAM transmitter using no multiplexing and wherein said interface circuit or said segmentation and reassembly circuit or said formatter circuit encodes each packet or ATM cell with logical channel data and each said RU modem includes means to receive said ATM cells and reassemble them into packets and reject any ATM cells or packets that are not directed to said RU modem as indicated by said logical channel.23.
The apparatus of claim 10 wherein each ATM cell is encoded by said formatter with logical channel data defining a single logical channel to which the RU modem to which the ATM cell is destined is assigned, and wherein said transmitter is an inverse Fourier transform transmitter and wherein the data from ATM cells encoded with a particular logical channel are modulated onto a single input frequency component assigned to that logical channel for input to said transmitter and wherein said transmitter receives many such input frequency components, each modulated with data assigned to a different logical channel and does an inverse Fourier transform thereon to generate a complex output signals which is transmitted directly to said RU modems.24.
The last cell in the packet is indicated by encoding 9th bits.
The CU cable data modem formatter then generates optimized downstream 2-byte headers for each downstream ATM cell by stripping off all but 2 bytes of VPI/VCI data.
The apparatus of claim 10 wherein said segmentation and reassembly circuit functions to add pad bits to and calculate error check bits on each packet received from said interface circuit and append said error check bits thereto such that the total number of bits in each packet is an integer multiple of 48 bytes, and then parses each packet, as modified by said interface circuit, into an integer number of standard ATM cell payload sections each comprising 48 bytes and generates a standard 5-byte ATM cell header for each said payload section and appends the header thereto, each said header containing data identifying the destination address to which the payload data is directed, and identifying which ATM cells are idle cells and identifying which ATM cell is the last cell in said packet as modified by said interface circuit in a PTI field.19.
The apparatus of claim 10 wherein said segmentation and reassembly circuit generates ATM cells with 48 bytes of payload data and a standard 5-byte headers including a PTI field which is encoded to indicate which ATM cell is the last ATM cell of the original inbound packet and includes 24 bits of VPI/VCI data which define in the 16 least significant bits said destination address to which the original inbound packet was directed, and wherein each RU modem is assigned to a single logical channel and wherein said formatter circuit strips all bytes of said 5-byte header of each ATM cell except the two bytes comprising the 16 least significant bits of said VPI/VCI data identifying the destination address and looks up in a mapping table the virtual link number assigned to an RU modem which is coupled to the device or process which has the destination address in said inbound packet received from the wide area network by the interface circuit and replaces said destination address with said virtual link number or adds said virtual link number to said header of each ATM cell, and adds a 9th bit to each byte of the modified ATM cell with a 2-byte header and encodes the data from said PTI field of each 5-byte header indicating which ATM cell is the last cell in said inbound packet into the 9th bits of said 2-byte header of each modified ATM cell, and wherein the formatter also encodes the 9th bits of the first 8 bytes of payload data with a unique start code to indicate where in each ATM cell the payload data starts.22.
The apparatus of claim 11 wherein said segmentation and reassembly circuit and formatter circuit include circuitry to communicate said ATM cells between them using an OC3 ATM TDMA protocol so that said formatter circuit and said segmentation and reassembly circuit can be spatially separated.14.
Anoxia villosa é uma espécie de insetos coleópteros polífagos pertencente à família Melolonthidae.
A autoridade científica da espécie é Fabricius, tendo sido descrita no ano de 1781.
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Trata-se de uma espécie presente no território português. This page is based on a Wikipedia article written by contributors (read/edit).