共 50 条
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- [37] SYSTEM-X - DIGITAL SUBSCRIBER SWITCHING SUBSYSTEM BRITISH TELECOMMUNICATIONS ENGINEERING, 1985, 3 (JAN): : 241 - 244
- [38] IN-SERVICE SUPPORT FOR SYSTEM-X EXCHANGES BRITISH TELECOMMUNICATIONS ENGINEERING, 1985, 3 (JAN): : 270 - 273
- [40] SYSTEM-X - SUBSYSTEMS .6. SOFTWARE SUBSYSTEMS POST OFFICE ELECTRICAL ENGINEERS JOURNAL, 1981, 73 (JAN): : 223 - 228