上海申通地铁有限公司董事长俞光耀在昨晚的一长新闻发布会上称，发生故障的系统是由卡斯柯信号有限公司制造的。
The system that had the fault was made by Casco Signal Ltd., Shanghai Shentong Metro Co. Chairman Yu Guangyao said at a press conference yesterday evening.
碰撞发生于因信号设备故障采用人工调度的时段，上海申通地铁有限公司在一份声明中称。
The crash happened while controllers were running operations using a manual system following an equipment failure, Shanghai Shentong Metro Group Co. said in a statement.
PDI 通讯实业有限公司自 1985 年成立以来就一直是电视视频信号接受，控制，传输领域的领头羊。
Since its inception in 1985, PDI Communications, Inc. has been a leader in the business of reception, control and transportation of television RF signals over cable.
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