Patent GB-314041-A (GB)
Title: Improvements in or relating to telephone installations
IPC: H04Q3/00
Filed: 1928-12-04
Abstract: 314,041. Siemens & Halske Akt.-Ges. June 23, 1928, [Convention date]. Automatic exchange systems-The method of operation of a register-controller taken into use for setting up a connection over an inter-exchange junction is determined by the route over which access to the junction is obtained. In the system described, the route of access determines whether or not a 200 point revertively controlled connector shall move over an additional ten terminals after it has been set in accordance with the units digit. The Specification also states that the route of access may determine whether a register-controller shall effect metering, but this is not fully described. The system described comprises a register-controller, Fig. 2, preselected by a switch such as DW which is seized over certain levels of a first group selector IGW of an exchange in which connections are set up by forwardly directed impulses. Corresponding lineterminals in two levels of IGW are multipled together as indicated at La2, La<3>, Lb2, Lb3, and corresponding test-terminals are connected over Lc2, Lc3 to a winding, of T1 the energization of which is determined by the thousands digit and brings about circuit changes in the register-controller whereby it controls the above mentioned additional movement of the connector. The additional reverting impulses are counted off on the hundreds register after restoration to normal. The Specification as open to inspection under Sect. 91 (3) (a) states also that the route of access determines whether the register-controller sends forwardly directed impulses or counts off revertive impulses. This subject-matter does not appear in the Specification as accepted. Preselection of an idle register-controller. The circuit of magnet Ddw of the switch DW is closed at 13 c1 by the relapse of relay C1 on release of the connection in which DW is engaged. The magnet closes contacts 16 ddw to operate T1(iii) so that Ddw and T1 interact to step the switch. Relays T1(ii) and K(ii) energize in series over ddw to battery over 120t2, Fig. 2,' at the next idle register-controller, these relays being shown in the operated condition. Registration of wanted subscriber's number. It is assumed for the. present that the first (thousands) digit indicates that the connector will he required to make the above-mentioned additional movement. The first group selector IGW steps up to a level giving access to the trunk La, Lb, Lc, over a line such as La3, Lb3, Lc3. Relay C1 pulls up over the c-wire in series with relay GL at the incoming group selector 2GW, Fig. 3, and opens the circuit of T1(ii) and K(ii), closes a fresh circuit for K over winding (i) in series with U (i) and R, Fig. 2, and completes a holding circuit for itself. Relay U does not now operate, but R removes the battery connection to ddw to busy the register-controller. It will be noticed that relay T1 holds over its winding (i) in the c-wire but, if the trunk had been seized over a level containing La2 - - Lc2 as the result of a first digit indicating no additional movement for the connector, T1 would fall back. The register comprises three relay chains H1 - - H5, Z1 - - Z5, E1 - - E5. and a pilot relay-group A, B, C2, D together with relays KH, KZ, KE to record whether the corresponding digit is even, and relays UH, UZ, UE which prepare the counting-out circuits in the case of certain digits. Dialled impulses incoming over the a-wire are repeated by relay I, the first impulse being repeated over 20i, 41b. 44d, 53z, 61uh to relay HI which locks up to ground at 18r. Relays F, W pull up and hold during the train. W being short-circuited at 22i between the impulses. At the first impulse, relay A energizes and is followed by C2 and when I falls back B(1) pulls up in series with A. The second impulse is not repeated to the counting chain since the circuit thereto is open at 41b, but when I falls back at the end of this impulse B is released so that the third impulse operates H2, relay 8 being operated during the even impulses to prevent their repetition. Relay D becomes operated during the 2nd, 3rd, 6th and 7th impulses so that the 3rd and 7th impulses are repeated to the chain over 44d, 54z, 62uh. Relay C2 falls back at the commencement of the 3rd and 7th impulses and is operated at the commencement of the 5th and 9th. At the end of the impulse train W falls back followed by F. In the meantime, if the digit is even, relay KH (i) operates in a circuit 23i, 58zh, 42b, 31f, 27w, 102an1, and if the digit is 3, 4, 7 or 8 UH(i) pulls up in a similar circuit over 39c2 and 56zh. Relays KH, UH lock up over windings (ii). Also, relays Z(i), ZH(i) operate over 37h1, 30f, 25w, 98an1, 18r, and lock over 51z to prepare the circuits for the reception of the next digit, and relav N(1) follows over 59zh, 107an2, b-wire, 9u, 3t1, and locks over N(ii). If the additional movement of the connector is not required, N would remain unoperated since its circuit would be open at 3t1. The control relays A, B, C2, D restore before the arrival of the next digit. The tens and units digit are registered on the trains Z1 - - Z5, E1 - - E5 in conjunction with relays UZ, UE, KZ, KE in a similar manner. Relays E, EH corresponding to Z, ZH pull up at the end of the tens digit. When the units digit has been registered, relays An1, An2 pull up and Z, ZH, E, EH fall back. At 99an1, resistance W1 is connected up in parallel to relay R so that relay U, Fig. 1, now operates, short circuits T1(i), and connects the a and b leads from the register-controller to the trunk La, Lb. Operation of group selector 2GW and connector (not shown). The fundamental circuit extends over relay GL, Fig. 3, 3K, Lb, 108an2, relay I, La, 3J, gt1. Relay GL completes a circuit 'for 3R which drives the sequence switch to position 2 in which the brush-choosing spindle is rotated by magnet NSp. The energization of relay I in the fundamental has operated relays F, W, A, C2 as previously described for the registration of the wanted number. Relays F, W lock up to ground at 18r since W is not now short-circuited over 100an1 between impulses. The register H1 - - H5 is counted out under the control of relays A, B, C2 D in a manner similar to that in which it was built up, relay I being intermittently short-circuited at the commutator Kom. An impulse is sent to the register on receipt of the 3rd and subsequent odd impulses from the group selector. If the digit is odd, the fundamental circuit is not opened until the receipt of the impulse following that which effected the counting out of the register. An even number of impulses is thus required and as A is de-energized during the even impulses, relay S1(i) operates over 80eh, 101an1, 28w, 34a, 117kh, 110h5, 58zh, 23i, and looks over S1(iii) a-wire, 3J, gt1. If the digit is even, relay S1 operates on receipt of the impulse which effects the counting out of the register since relay A is operated on the odd impulses and KH was operated during the setting of the register. If the digit is 9 or 0 relay H5 is already operated and S1 operates on receipt of two impulses or one impulse respectively. Relay S1 opens the fundamental circuit at 114s1, unlocks relays H1 - - H5 and opens the circuit of relays W, F during the release of which relay S1 completes a circuit for relays Z(ii), ZH(ii) which lock up in series with P over 55zh, 106an2, 98an1, 18r, and prepare the circuits for controlling the setting of the connector. The relapse of GL, Fig. 3, when the fundamental is opened, stops the brush choosing movement and drives the sequence switch out of position 2 into a position in which GL operates over 3K and the b-wire to ground at 69f. Brush-carriage magnet WGW is energized and when an idle connector is found GT(1) operates over the test wire and unlocks S1(iii), Fig. 2, which releases GL to drive the sequence switch forward to switch through to the connector. The fundamental circuit for the connector is now complete and the connector is set under the control of the tens and units registers. At the end of the tens selection and during the release of relays W and F, S1 complete a circuit over winding (ii) of E which locks over winding (i) in series with EH. After the units register E1 - - E5 has been counted out, relay S1 does not operate to open the fundamental circuit since, in the case under consideration, the connector has to be moved over an additional ten terminals. The circuit for S1 over contacts of E5 has been opened at 64n by relay N, but a circuit for S2(ii) is completed over 64n, 111s1, 80eh, 101an1, 28w, 34a, 103ke, 97e5, 79eh, 124s2, 78eh, 58zh, 23i. Relay S2 locks up over winding (i). The additional reverting impulses from the connector are now repeated to the hundreds register HI - - H5 over 20i, 41b, 44d (operated), 54z, 88e, 130ue, 126s2, 61uh, 46h2 or over 44d (normal), 53z, 87e, 131ue, 125s2, 62uh. After ten impulses have been counted off, relay S1 operates in a circuit 23i, 58zh, 78eh, 124s2, S1(ii), 110h5, 117kh, 34a, 28w and thence. over the previously traced circuit over S2(ii). The fundamental circuit is opened at 114s1 and the connector proceeds in known manner. Release of register-controller and switching through of connection in Fig. 1. Relay S1 at contact 111s1 removes a short-circuit around T2(ii) and throws this winding into the abovetraced circuit of S2(ii). Relay T2 operates and releases R which at 18r unlocks the relays in the registers. Relays F and W have already been released by S1 and the remaining operated relays fall back. When relay T2 energized it opened the holding circuit of relays K, U, Fig. 1.. Relay K (shown operated) falls back and completes the connection over the trunk La, Lb.