SONET technology in terms of low complexity and overhead, but DTM includes signaling and switching to increase the flexibility and avoid the hierarchical structure of SONET.

就低的复杂度和开销而言，DTM与SONET技术相拟，但DTM还包括信令和交换，以增加灵活性和避免SONET的层次结构。

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DTM is similar to SONET technology in terms of low complexity and overhead, but DTM includes signaling and switching to increase the flexibility and avoid the hierarchical structure of SONET.

就低的复杂度和开销而言，dtm与sonet技术相拟，但dtm还包括信令和交换，以增加灵活性和避免sonet的层次结构。

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Sonet salesmen solemnly warn new customers that they may use their new handsets only from their offices.

ECONOMIST: Russian telephones

Cut through a Sonet ring and the highly reliable optical gear just sends traffic in the other direction.

FORBES: The God Box

Metro networks have phone gear like digital cross-connects, which manage high-and low-speed traffic, and synchronous optical network (Sonet) systems, which come from fiber-optic phone networks.

FORBES: The God Box