ITU-T F 71-1993 INTERCONNECTION OF PRIVATE TELEPRINTER NETWORKS WITH THE TELEX NETWORK《专用电传机网与用户电报网的互连》.pdf
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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 (b) that in various countries possessing public telex networks there also exist numerous private teleprinternetworks using their own exchanges and conforming with the national regulations of the country concerned;(c) that the owners of these private netwo
2、rks are frequently substantial users of the telex service employingmultiple subscriber lines;(d) that, consequently, it is very desirable to allow the through-connection of calls between teleprintersconnected to private exchanges and those connected to the public telex network;(e) that in the teleph
3、one service the ability to establish calls between stations connected to private and publicexchanges has long been available;(f) that the operation of the international public telex service must be neither hampered nor limited by privateexchanges and hence the conditions for interconnection of the t
4、wo types of network should be standardized,declares the following1 Any terminal in a private network that may be directly connected (circuit switched) to a terminal in theinternational telex network must conform to the relevant requirements for terminals in the telex network as laid downin the Serie
5、s F and S Recommendations.2 A private network must not be allowed to provide communication between two external telex stations. For theprovisions concerning interconnection between international leased circuits and the telex network, seeRecommendation D.1 1.3 Where a private network uses a message s
6、tore-and-forward system, it may be authorized to accept and delivermessages from and to the public network. The signals from the private network must always conform with the telexnetworks signalling standards.4 When a private network connected to the telex network offers an external caller the facil
7、ity of selecting a givenextension directly, this should be clearly indicated in the public telex directory.5 Either two-stage or single stage selection may be used as a means of automatic selection of a subsidiary stationin the private network by an external caller.6 For two-stage selection the foll
8、owing provisions should be applied:1) The first stage of the selection should designate the called private network, using a conventional nationalsubscriber number. Following the normal telex procedure, this sequence should start the selection process,resulting in the callers being connected to a tel
9、eprinter (or any other appropriate device in the privatenetwork) that is ready to record a message. For networks where the called telex subscribers answer-back istripped automatically, this answer-back code must designate and be common to the whole of the privatenetwork concerned.2) Application of t
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