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公开(公告)号：AT341877T
公开(公告)日：2006-10-15
申请号：AT01000643
申请日：2001-11-19
Applicant: TELOGY NETWORKS INC
Inventor： GEORGE EDWARD , GUVEN ERHAN , FRUTH FRANK EDWARD
Abstract: The modem relay provides a local interface to the modem on both ends of a call, demodulates the full duplex data stream, packetizes the bits for transport over an IP network, and remodulates the data stream at the remote end. The modem relay provides bandwidth savings, and resistance to network packet loss. The modem relay mitigates the problems associated with using G.711 to send modem traffic, the physical layer of the modem signal is terminated locally for both ends of the call, only the data stream is sent over the network, and saving bandwidth. The modem data stream can also be transported in a redundant fashion, which allows for seamless error recovery in the event of single or double packet loss events. Since the data stream can be completely recovered after packet loss, the remote modem is able to recreate the local modem's transmission exactly. Bandwidth savings are also realized because the IP network only carries modem traffic when data is transmitted by the modem. When the modem is not transmitting data, no packets are sent on the IP network. In contrast, continuous 64 kbps packetization takes place when using G.711 to carry modem traffic. Lost packet recovery minimizes computational requirements and provides for recovery of lost packets during burst loss of a series of sequential packets. A redundant series of packets is sent with a staggered delay from the original series of packets. Staggering the transmission of redundant packets allows for the recovery of packets in the event that more than a single packet is lost. The length of the stagger must be greater than the length of the lost packets for all packets to be recovered. Staggering the transmission of redundant packets creates a delay in the recovery of lost packets equal to the length of the stagger. The length of the stagger is selected to accommodate expected burst packet loss and to provide acceptable delay.
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公开(公告)号：DE60123553T2
公开(公告)日：2007-08-16
申请号：DE60123553
申请日：2001-11-19
Applicant: TELOGY NETWORKS INC
Inventor： GEORGE EDWARD , GUVEN ERHAN , FRUTH FRANK EDWARD
Abstract: The modem relay provides a local interface to the modem on both ends of a call, demodulates the full duplex data stream, packetizes the bits for transport over an IP network, and remodulates the data stream at the remote end. The modem relay provides bandwidth savings, and resistance to network packet loss. The modem relay mitigates the problems associated with using G.711 to send modem traffic, the physical layer of the modem signal is terminated locally for both ends of the call, only the data stream is sent over the network, and saving bandwidth. The modem data stream can also be transported in a redundant fashion, which allows for seamless error recovery in the event of single or double packet loss events. Since the data stream can be completely recovered after packet loss, the remote modem is able to recreate the local modem's transmission exactly. Bandwidth savings are also realized because the IP network only carries modem traffic when data is transmitted by the modem. When the modem is not transmitting data, no packets are sent on the IP network. In contrast, continuous 64 kbps packetization takes place when using G.711 to carry modem traffic. Lost packet recovery minimizes computational requirements and provides for recovery of lost packets during burst loss of a series of sequential packets. A redundant series of packets is sent with a staggered delay from the original series of packets. Staggering the transmission of redundant packets allows for the recovery of packets in the event that more than a single packet is lost. The length of the stagger must be greater than the length of the lost packets for all packets to be recovered. Staggering the transmission of redundant packets creates a delay in the recovery of lost packets equal to the length of the stagger. The length of the stagger is selected to accommodate expected burst packet loss and to provide acceptable delay.
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公开(公告)号：DE60123553D1
公开(公告)日：2006-11-16
申请号：DE60123553
申请日：2001-11-19
Applicant: TELOGY NETWORKS INC
Inventor： GEORGE EDWARD , GUVEN ERHAN , FRUTH FRANK EDWARD
Abstract: The modem relay provides a local interface to the modem on both ends of a call, demodulates the full duplex data stream, packetizes the bits for transport over an IP network, and remodulates the data stream at the remote end. The modem relay provides bandwidth savings, and resistance to network packet loss. The modem relay mitigates the problems associated with using G.711 to send modem traffic, the physical layer of the modem signal is terminated locally for both ends of the call, only the data stream is sent over the network, and saving bandwidth. The modem data stream can also be transported in a redundant fashion, which allows for seamless error recovery in the event of single or double packet loss events. Since the data stream can be completely recovered after packet loss, the remote modem is able to recreate the local modem's transmission exactly. Bandwidth savings are also realized because the IP network only carries modem traffic when data is transmitted by the modem. When the modem is not transmitting data, no packets are sent on the IP network. In contrast, continuous 64 kbps packetization takes place when using G.711 to carry modem traffic. Lost packet recovery minimizes computational requirements and provides for recovery of lost packets during burst loss of a series of sequential packets. A redundant series of packets is sent with a staggered delay from the original series of packets. Staggering the transmission of redundant packets allows for the recovery of packets in the event that more than a single packet is lost. The length of the stagger must be greater than the length of the lost packets for all packets to be recovered. Staggering the transmission of redundant packets creates a delay in the recovery of lost packets equal to the length of the stagger. The length of the stagger is selected to accommodate expected burst packet loss and to provide acceptable delay.
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