. The Bell System technical journal . Fig. 17 — Prototype model of connectorbox unequipped showing grid wires. Fig. 18 — Typical terminal netw(mounted in a prototype connector b( THE TYPE PI CARRIER SYSTEM 373 obtained by cutting the wires at various points by simply drilling holesin the phenol structure supporting the wire. Terminal and Repeater Mounting A complete terminal ready for installation at a remote location is shownin Fig. 18. The top position in the connector is shown vacant. This iswhere the connections to line and power supply are made by means ofanother plug-in printed wirin
. The Bell System technical journal . Fig. 17 — Prototype model of connectorbox unequipped showing grid wires. Fig. 18 — Typical terminal netw(mounted in a prototype connector b( THE TYPE PI CARRIER SYSTEM 373 obtained by cutting the wires at various points by simply drilling holesin the phenol structure supporting the wire. Terminal and Repeater Mounting A complete terminal ready for installation at a remote location is shownin Fig. 18. The top position in the connector is shown vacant. This iswhere the connections to line and power supply are made by means ofanother plug-in printed wiring board with attached flexible wiring forthe external Fig. 19 — PI carrier remote terminal in pole mounted cabinet. 374 THE BELL SYSTEM TECHNTCAL JOURNAL, MARCH 1057 The equipment described here is equally adaptable to central officemounting and pole mounting at remote locations. At the remote loca-tions, however, it is necessary to provide the equipment with an outerhousing which gives protection from all kinds of weather and even frommoisture condensation. The opened housing is shown in Fig. 19. Fig. 20shows a typical remote mounting of the housing on the left. In previouselectron tube carrier systems the amount of heat generated by the equip-ment itself was sufficient to pre\ent moisture condensation. In the case
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
