Forwards all HDLC traffic on a direct STUN link. Use the no form of this command to disable this method of TCP encapsulation. Use the address that identifies the remote STUN peer that is connected to the far serial link. Use the no form of this command to disable the new protocol. It can be up to 20 characters long.
Primary nodes poll secondary nodes in a predetermined order.
Secondary nodes respond to polls sent by the SDLC primary by transmitting any outgoing data they might have.