Abstract: A packet receiving unit (4) receives an IP packet having a network parameter and a transmission source identifier. A transmission source identifier table (5) records the transmission source identifier of the received IP packet. A packet storage processing unit (6) stores the received IP packet in a first buffer (7) regardless of the network parameter if the transmission source identifier of the received IP packet coincides with a transmission source identifier recorded in the transmission source identifier table. A packet extraction/transmission unit (8) extracts the IP packet stored in the first buffer (7) from the first buffer (7) and transmits the packet.

Abstract: A reception buffer of a packet reception apparatus includes a plurality of storage addresses. A packet determination unit receives a packet from a plurality of lines including a main system and an auxiliary system. The packet determination unit obtains a storage address corresponding to a unique number assigned to the packet, and overwrites and stores data of the packet onto the storage address. A packet extraction/transmission unit extracts and transmits the data stored in the reception buffer.

Abstract: A reception buffer of a packet reception apparatus includes a plurality of storage addresses. A packet determination unit receives a packet from a plurality of lines including a main system and an auxiliary system. The packet determination unit obtains a storage address corresponding to a unique number assigned to the packet, and overwrites and stores data of the packet onto the storage address. A packet extraction/transmission unit extracts and transmits the data stored in the reception buffer.

Abstract: A packet receiving unit (4) receives an IP packet having a network parameter and a transmission source identifier. A transmission source identifier table (5) records the transmission source identifier of the received IP packet. A packet storage processing unit (6) stores the received IP packet in a first buffer (7) regardless of the network parameter if the transmission source identifier of the received IF packet coincides with a transmission source identifier recorded in the transmission source identifier table. A packet extraction/transmission unit (8) extracts the IP packet stored in the first buffer (7) from the first buffer (7) and transmits the packet.

Abstract: A packet reception apparatus receives a plurality of types of packets classified in categories including at least one of a content of a request information from a transmission side, a type of packet communication format, and a video data compression method. A plurality of buffers (B-1, B-2) assort the plurality of types of received packets according to the types thereof and store the plurality of types of received packets as assorted. A packet extraction processing unit extracts the packets stored in the plurality of buffers (B-1, B-2) according to a packet processing condition table. A packet calculation processing unit performs a calculation process of the packets extracted by the packet extraction processing unit.

Abstract: A TTS preparation processing section attaches a time stamp to each of packets in an MPEG-2 TS (Transport Stream) to convert the MPEG-2 TS into an MPEG-2 TTS (Time-stamped Transport Stream). A grouping section collects a predetermined number of packets in the MPEG-2 TTS to form a group. A null packet removal section removes null packets from the group. A transmitting section shifts the MPEG-2 TTS packets in the group, from which the null packet has been removed, frontward to convert the MPEG-2 TTS packets into an RTP (Real-time Transport Protocol) packet and transmits the RTP packet to a communication line.

Abstract: A TTS preparation processing section (5) attaches a time stamp to each of packets in an MPEG-2 TS (Transport Stream) to convert the MPEG-2 TS into an MPEG-2 TTS (Time-stamped Transport Stream). A grouping section (6) collects a predetermined number of packets in the MPEG-2 TTS to form a group. A null packet removal section (7) removes null packets from the group. A transmitting section (8) shifts the MPEG-2 TTS packets in the group, from which the null packet has been removed, frontward to convert the MPEG-2 TTS packets into an RTP (Real-time Transport Protocol) packet and transmits the RTP packet to a communication line (3).