1、CEPT T/CS*20-07*E 83 2326434 O004533 4 W Page E 1 Recommendation T/CS 20-07 E (Cannes 1983) SUBSCRIBER DEDICATED STORAGE Recommendation proposed by Working Group T/WG 11 “Switching and Signalling” (CS) Text of the Recommendation adopted by the “Telecommunications” Commission: “The European Conferenc
2、e of Posts and Telecommunication Administration, considering - that SPC type of exchanges allow a flexible introduction of services for the subscribers; - that new SPC technique offers the possibility to assign services and terminal equipment to the subscribers without - that the variety of services
3、, tesminal equipment and subscribers line types is likely to increase when the network - that owing to SPC technique the functions actually applying to a subscribers line are dependent on data stored recommends to the members of the CEPT to design the named “subscribes dedicated storage” feature as
4、specified below.” 1. DEFINITION manual intervention by the operating personnel; evolves toward wide use of digital techniques; in. the network, a Feature of an ISDN component to store data in addition to the LSM (line service marking) for each customer and which contains the registration data for su
5、pplementary services that have been subscribed to (i.e. listed in the LSM as binary 1). For example i would contain a list of abbreviated numbers, 2. DESCRIPTION Subscriber dedicated storage (SDS) can be assigned to any subscriber line depending on the service requested. The memory may be subdivided
6、 into individual areas which are specific to individual services. The SDS can contain long-term information, such as conversion tables for - abbreviated dialling; - xed destination calls; - diverting of calls, etc. or information used during the call phase, such as reference information for - three-
7、party service; - call waiting connections, etc. In general, the SDS data can be stored and assigned to the subscriber line: - by the administration; - by the subscriber; - by call processing control. The subscriber has access to the SDS either from the subscribers premises or, in the case of certain
8、 services, from remote premises. The latter type of access may be restricted by the Administration, depending on the line category, the class of service or the date type. 3. TECHNICAL CHARACTERISTICS The different SDS areas may be organized either: - as pool-administered areas or - as areas assigned
9、 on a fixed basis. SDS administered in pool areas is generally used for services which are assigned to a small number of subscribers. Assignment of SDS to subscriber line is flexible and can be changed or removed. For services in great demand the SDS areas should be assigned on a fixed basis to the
10、individual subscribers line (equipment number) or service data. Safeguarding of subscriber data: Permanent and semipermanent subscriber data are protected by multiple means, i.e. they are stored in two mutually independent stores. Note: The studies on this series (T/CS 20) of Recommendations for the
11、 features in an analogue environment has now been terminated. A continuation of the studies has started with the aim to amend these existing features, where necessary, and to specify new features for the ISDN. These Recommendations will be gathered in a new series of Recommendations. O Edition of Ma
12、y 15, 1986 I CEPT T/CS*20-07*E 83 E 2326431-1 0030694 9 TICS 20-07 E Page 2 4, UTILISATION The subscriber dedicated storage ensures e.g. PBX line hunting. DDI. Malicious caller identification. Call diversion. Completion of calls. Multi-party conference calls. Abbreviated dialling. Call interception. Fixed destination calls. Service restriction in the outgoing direction. Call charge information. Edition of May 15, 1986 -
