Protocol may require end to end connect indication over the network. End to end link connection establishment over the FR network will be indicated to the user by using DCD or RTS control signals, depending on the clock mode: DCE or DTE respectively. The options are : - On : DCD(DCE)/RTS(DTE) will be constantly ON no matter if the End to End connection is established or not. - End to End: The DCD(DCE)/RTS(DTE) will be according to the status of the End to End connection.