The terminal devices of DA ( RTU ) embodies FTU , DTU and TTU .

配电自动化系统远方终端（RTU）包括FTU、DTU和TTU。

The DTR concentrator consists of C-Ports and a data transfer unit ( DTU ) .

DTR集中器由C-Ports（集中器端口，简称C口）和数据传输器（DTU）组成。

The results indicate that SINS autonomous alignment can be completed by SINS / DTU integration .

结果表明，这种基于SINS/DTU组合的方法能够实现SINS系统的自主式初始对准；

SINS / DTU integration system and SINS / GPS integration system are compared .

比较了SINS/DTU组合系统和SINS/GPS组合系统的对准机理；

The DTU ( Data Terminal Unit ) based on GPRS net-work is introduced .

介绍了基于GPRS网络的数据终端单元（DTU）。