| PSTN today
summarized |
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| n | Gets still more
subscribers! |
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| n | ISDN very
popular in switches (in Finland all-digital |
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| exchanges) |
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| n | ISDN getting
popular also for local loop access |
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| n | Versatile access
part |
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| n | Conventional
local loop technology develops fast |
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| n | Remote
controlled O&M |
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| n | IN services
fully-developed - Intelligence moves to |
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| terminals |
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| n | Fiber-optical
DWDM links connect exchanges |
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| n | Common channel
signaling (SS7) |
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| n | SDH-based
(Synchronous Digital Hierarchy) trunk- |
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| networking |
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