Switched digital services

The alternative to analog switched services are the digital switched services. The digital switched services are gradually replacing analog services as networks move to all-digital provision. The digital transmission systems as detailed in Section 6.4 are now being connected to digital 4-wire switches to create a switched digital network. In the next sections the following types of digital switched services will be discussed:

• Integrated services digital network (ISDN-BRI)

• Switched multi-megabit data services (SMDS)

• Asynchronous transfer mode (ATM).

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