(The connection between the private network of the Ministry of Railways and the public network adopts the dial-by-number (DID) method to replace the c&cO8 switches of the Guangzhou communication section and the Changsha electric service section, which are imitated by the loop relay method, and use No1 signaling to terminate the DID networking; Huaihua electric service section The c & c08 switch (version R03B), select No. 7 Signaling is interconnected with the public by quasi-synchronization, forming 8 2Mb/s channels, the length of the private network number is 5, and the length of the public number is 7
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