The ATM layer is common to all services including signalling and OAM.
ATM层对于所有的业务，包括信令和OAM都是共用的。
This recommendation defines the functions of the Asynchronous Transfer Mode(ATM)layer.
本建议规定了异步转移模式（ATM）层的功能。
This recommendation defines the functions of the Asynchronous Transfer Mode(ATM)layer.
本建议规定了异步转移模式（ATM）层的功能。
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