. The Bell System technical journal . 2additional cable pairs are provided from each concentrator to the centraloffice for signaling and power supply purposes. The use of these two pairsof control conductors is described in detail in Section 6g. The concentrator acts as a slave unit under complete control of thecentral office. The line busy and service request signals originate at the LINE 60 LINES I »-o 0 5 9 7 ^ / ^ / ■v / p, ■^ i \. ^ V •y \ / s f \ ^ \ ,• \ ^ ^ 1 > f 1 2 3 5 6 8 9 10 11 Fig 4. — Concentrator trunkto line crosspoint pattern andpreference order CONCENTRATORTRUNKS 9 9 9
. The Bell System technical journal . 2additional cable pairs are provided from each concentrator to the centraloffice for signaling and power supply purposes. The use of these two pairsof control conductors is described in detail in Section 6g. The concentrator acts as a slave unit under complete control of thecentral office. The line busy and service request signals originate at the LINE 60 LINES I »-o 0 5 9 7 ^ / ^ / ■v / p, ■^ i \. ^ V •y \ / s f \ ^ \ ,• \ ^ ^ 1 > f 1 2 3 5 6 8 9 10 11 Fig 4. — Concentrator trunkto line crosspoint pattern andpreference order CONCENTRATORTRUNKS 9 9 9 9 9 9 9 9 9 9 9 9 8 8 8 8 8 8 8 8 8 8 8 8 6 0 5 4 7 5 3 1 4 7 2 1 7 3 1 5 2 0 6 4 6 5 0 3 1 7 2 3 6 2 4 0 0 6 3 5 0 4 6 2 3 7 1 6 2 4 1 7 1 5 6 8 VERTICAL GROUPS OF FIVE LINES EACH ORDER OF PREFERENCE GAS TUBE REED-RELAYCROSS POINTS 10 11 258 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 49LINES TEN GROUPSOF LINES 49 LINES I CENTRAL OFFICELINE LINK FRAME LINE SW 1 CON-NECTOR 11 1 — --1 1 CON-NECTOR I TO MARKER. TRUNKLINKFRAME Fig. 5(a) — No. 5 crossbar system subscriber lines connected to line link frame. 60 LINES 60LINES 600
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
