E.F. Johnson Company MULTI-NET II Especificaciones descargar pdf (Pagina 119)

TELEPHONE INTERFACE MODULE (TIM)

14-9

oscillator of U211 running at ≈ 3.7 kHz. With U244,

pin 12 low the output of U210, pin 9 is a “1” (U210,

pin 12 is constantly being retriggered). If a transient

“0” during a logic “1” is encountered at the E-Lead,

U210, pin 7 is retriggered causing U211, pin 3 to go

high for 5 ms. This will not change the output of

U211, pin 9 because it is being retriggered. If U211,

pin 3 stays high longer than 10 ms, U211, pin 9 goes

low. For this to occur, the transient would need to

exceed 10 ms.

Figure 14-13 4-WIRE E&M BLOCK DIAGRAM (-680)

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 213 214

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E.F. Johnson Company MULTI-NET II Especificaciones Pagina 119