ANALYZER FOR AUTOMATIC TELEPHONE EXCHANGES

1,167,177. Automatic exchange systems. TELEFONAKTIEBOLAGET L.M. ERICSSON. 9 Nov., 1966 [9 Nov., 1965], No. 50335/66. Heading H4K. In a directory number/equipment number translator utilizing an arrangement of ring cores through a selection of which each line's test wire is threaded in a unique manner, some of the test wires thread additional cores which denote special services in respect of the associated lines. The service described is a call diversion facility which may involve either diversion of calls to an operator's position where the wanted number is displayed on a lamp panel or automatic diversion of calls to a particular party. The "translating" cores may be of the non-remanent type (Fig. 1) or of the squareloop type (Fig. 2, not shown), the method of reading and writing of the latter being marginally different from the former, but the "service-indication" cores are always of the square-loop type. The translator is similar to that described in Specification 1,178,890. Translator ANL (Fig. 1).-This comprises a distribution frame MK whose inlets L1 to LM represent directory numbers and whose outlets T1 to TN represent equipment numbers. Each inlet and outlet has two appearances on the frame, those on the inlet side being connected to "wipers" X1 and Y1, respectively, of selector V and those on the outlet side to "special service" cores, e.g. e11 and e1, respectively. Each core associated with the outlet appearances, e.g. T1, represents a different service. The test wire from T1 through core e1 is threaded through a selection of the cores gl-v and is connected to a common wire extending to positive battery in a pulse generator PG. Whenever an interrogate pulse passes through one of the test wires, output signals indicative of the required equipment number, are produced on a selection of the wires ta-tv with consequent setting of bi-stable circuits VK1-VKp in a recorder AK. Output signals on wires te, te1 denote what, if any, special services are associated with the test wire being interrogated. The test wire from T1 through core e11 may also be threaded through an array of translation cores (not shown) in order to provide an automatic diversion facility to a party other than the operator. Outgoing call.-If PBX subscriber A1 initiates such a call by dialling 0, his initial connection via selectors SLA &c. and local junctor SNR to register REG6 is broken down and a new connection to an outgoing line FLU is set up. Incoming calls on lines FL1 are directe