A packet used by a data terminal equipment ( DTE ) or by a data circuit terminating equipment ( DCE ) to indicate a temporary inability to accept additional packets for a virtual call or permanent virtual circuit.

• 数据终端设备(DTE)或数据电路端接设备(DCE)使用的信息包，用来表示暂时无法接收虚拟呼叫或永久虚拟电路的附加信息包。