Patent ID: 7724751

Claim:
A data transmission support device for sending data from a first ATM device to a second ATM device by an ATM cell, the data transmission support device comprising: a data frame reception portion that receives a data frame that is an Ethernet frame including an ATM cell encapsulated therein from another device via Ethernet, the other device being connected to the first ATM device; a control frame reception portion that receives a control frame via the Ethernet, the control frame being sent by the other device at a predetermined time interval in accordance with a clock frequency of the first ATM device that is a clock frequency for communication of the first ATM device; a clock reproducing portion that reproduces a clock having the same frequency as the clock frequency of the first ATM device in accordance with the time interval of receiving the control frames; a clock transfer portion that transfers the reproduced clock to the second ATM device via an ATM interface; a conversion portion that converts the received data frame into an ATM cell; and an ATM cell transmission portion that sends the ATM cell converted by the conversion portion to the second ATM device via the ATM interface.