History of Public switched telephone network

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	Revision 22 . . December 10, 2001 3:27 am by The Anome *[mentioned private networks with gateway links only]**
	Revision 21 . . December 10, 2001 2:41 am by The Anome [Mentioned private telephone networks]
	Revision 20 . . December 6, 2001 4:38 pm by The Anome [T1/E1 example, see also telecommunications ]
	Revision 19 . . December 6, 2001 4:27 pm by The Anome [linked to mobile phones, mentioned fixed line origins]
	Revision 18 . . December 6, 2001 3:19 pm by Alan Millar [DS0, T1, PCM]
	Revision 17 . . (edit) December 4, 2001 8:17 am by The Anome [...and packet switching]
	Revision 16 . . December 4, 2001 8:16 am by The Anome [link target, 'circuit switching']
	Revision 15 . . (edit) December 4, 2001 8:14 am by The Anome [fixup sentence]
	Revision 14 . . December 4, 2001 8:12 am by The Anome [name in caps (there's only one) and term in bold]
	Revision 13 . . December 1, 2001 7:11 am by The Anome [-> A.K. Erlang]
	Revision 12 . . December 1, 2001 6:37 am by The Anome [mentioned traffic engineering]
	Revision 11 . . November 1, 2001 6:10 am by (logged).253.40.xxx [Link hook for 'synchronization']

Difference (from prior major revision) (author diff)

Changed: 20c20

Note: there are also a number of large private telephone networks which are not part of the PSTN, usually for military purposes.

Note: there are also a number of large private telephone networks which are not linked to the PSTN, usually for military purposes. There are also private networks run by large companies which are linked to the PSTN only through limited gateways, like a large PABX system.