There are many different kinds of PSTN signaling, including signaling between local exchanges.

有许多不同种类的PSTN信令，包括在本地交换之间信号。

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In this paper, the common transmission methods between local exchanges are compared on economics by means of breakeven analysis.

本文采用盈亏点分析法对常见市话局间中继传输方式进行了经济性比较。

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Exchanges and cooperation at local levels are an important part of the friendly relationship.

地方的交往与合作是我们两国友好关系的重要组成部分。

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They can ask for space in up to 1, 500 of the 6, 500 local exchanges that BT is opening up.

BBC: BT rolls the dice

Furthermore, its new market for growth shares, the Neuer Markt, is luring regional start-ups away from their local exchanges.

ECONOMIST: German stockmarkets

In the U.S. local exchanges began to disappear in the 1930s.

FORBES: Why the world would be better off with one big stock market.