NT8D15 E and M Trunk card............................................................................................................ 58
Installation........................................................................................................................................ 59
Operation.......................................................................................................................................... 60
Host interface bus............................................................................................................................ 60
Trunk interface unit........................................................................................................................... 65
Uses................................................................................................................................................. 67
Features........................................................................................................................................... 67
Specifications................................................................................................................................... 68
Installation........................................................................................................................................ 69
Maintenance..................................................................................................................................... 69
Contents.................................................................................................................................................... 71
Card slots - Large System......................................................................................................................... 71
Circuit and installation............................................................................................................................... 71
Precautions............................................................................................................................................... 74
Installing a circuit card............................................................................................................................... 76
Contents.................................................................................................................................................... 79
Introduction............................................................................................................................................... 79
Conference cards...................................................................................................................................... 79
Digitone receiver cards............................................................................................................................. 81
Line cards.................................................................................................................................................. 82
Multifrequency sender cards..................................................................................................................... 82
Network cards........................................................................................................................................... 83
Trunk cards............................................................................................................................................... 84
Tone and digit switch cards....................................................................................................................... 85
Contents.................................................................................................................................................... 87
Circuit card grid......................................................................................................................................... 87
General purpose switches................................................................................................................ 91
Trunk interface switches................................................................................................................... 91
Ring ground switches....................................................................................................................... 92
NT6D42 Ringing Generator DC................................................................................................................ 95
NT8D14 Universal Trunk card................................................................................................................... 98
NT8D15 E and M Trunk card.................................................................................................................... 101
NT8D17 Conference/TDS card................................................................................................................. 102
NT8D21 Ringing Generator AC................................................................................................................ 103
NT8D22 System Monitor........................................................................................................................... 103
NT8D22 jumper settings................................................................................................................... 107
4
Circuit Card Reference
71
79
87
July 2011