Rules for the classification of sea-going steel ships(2012)
YD/T729-94 Methods for Automatic Exchanger Networks Acess
GF002-9002.4 Technique Specification for Automatic Exchanger Equipments in techinical Ministry of Posts and Tele Communication.
1. Emergency Conversion, Exchanger user AC220V and Standby Power DC 24V can be automatically switch.
2. PA Interface, the users can remote PA.
3. Trunk, two circuits repay interface(Shortline)
4. User Priority, three Priority Level.
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