USRP2, dial tone example

Dear all,

Recently i changed SD card image for my USRP2 + RFX2400. I flash SD card
with, txrx_raw_eth_20100608.bin and u2_rev3-20100603.bin.

Now i’m trying dial tone example between two USRP2 boards. At the
receiver, i can only hear dial tone after sometime (about 15sec) the
transmitter has started. When i stop the transmitter, i still can hear
dial tone. I also see SSSSSSSSS at the receiver.

Am I using the correct images for SD card? Or other problem?

Best Regards,
Phone Naing