qpsxBNC²³⁶²¹³⁺¹ 例句 IEEE standard for MANs Metropolitan Area Networks. Formerly known as QPSX Queued Packet and Synchronous Exchange, now known as DQDB Distributed Queue Dual Bus. It was approved in 1990. IEEE关于城域网标准。原来的名称为 QPSX队列分组同步交换，现名为 DQDB分布式队列双总线，1990年获得批准。 iciba