. The Bell System technical journal . ed in amanner similar to that used in telephone practice, the No. 1switchboard using manual start machine ringing and the smallerNo. switchboard using manual ringing. While the cord isconnected to one line and the operator is attempting to completethe connection to another line, the first line is held closed in order notto mar transmission. 526 BELL SYSTEM TECHNICAL JOURNAL Conference Connections The teletypewriter exchange system provides a means wherebypractically unlimited numbers of stations can be connected in con-ference connections. Figure 14 sh
. The Bell System technical journal . ed in amanner similar to that used in telephone practice, the No. 1switchboard using manual start machine ringing and the smallerNo. switchboard using manual ringing. While the cord isconnected to one line and the operator is attempting to completethe connection to another line, the first line is held closed in order notto mar transmission. 526 BELL SYSTEM TECHNICAL JOURNAL Conference Connections The teletypewriter exchange system provides a means wherebypractically unlimited numbers of stations can be connected in con-ference connections. Figure 14 shows a typical conference link in the conference circuit is provided with a simple repeater,each of which is equipped for breaking. In this manner to and frocommunication by the half-duplex method operation can be conference repeater circuits are made up in groups of five or ten,each of which is equipped with a multiple appearance so that alloperators have access to the repeaters. O SWITCHBOARDO SUBSCRIBER. Fig. 14—Typical conference connection. Regenerative Repeaters It is necessary in some long circuits to improve transmission byinserting a regenerative repeater in the circuit. To make this possibleand easily performed by any operator, regenerative repeaters areprovided with a complete jack multiple appearing before all ends of the repeater are available in this multiple and the repeatermay be inserted where the transmission equivalent of the circuitinvolved makes it necessary. Typical Built-Up Connection In order to provide TWX service on a nationwide basis, certain ofthe connections require one or more intermediate switchboards sothat one or more through operators may be involved. As an illustra-tion of this Fig. 15 shows a connection established between a callingstation in New York and a called station in San Francisco with athrough switch at Chicago, a method used when all direct trunks arebusy. This figure shows the manner in
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