MH88634-2 Mitel, MH88634-2 Datasheet
MH88634-2
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MH88634-2 Summary of contents
Page 1
... XLD LRC Loop Relay LRD Driver VRLY RGND Central Office Interface Circuit MH88634-2 Description 2 ) The Mitel MH88634 Central Office Trunk Interface circuit provides a complete audio and signalling link between audio switching equipment and a central office. The functions provided by the MH88634 include 2-4 Wire conversion, 600 impedance and network balance ...
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... MH88634 Pin Description Pin # Name 1 TIP Tip Lead: Connects to the “Tip” lead of the central office 2 RING Ring Lead: Connects to the “Ring” lead of the central office 3 XLA Loop Relay Contact A:. Connects to XLB through the Loop relay (K1) contacts when the relay is activated. This operates the internal active termination circuitry. ...
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... SHK output is active if either forward loop or reverse loop current is detected. Line Impedance The input impedance of the MH88634-2 is 600 ohms. The network balance is also set at 600 ohms to maximize the Transhybrid Balance. Transmit and Receive Gain Transmit Gain (Tip-Ring) is set at 0dB and Receive Gain (Rx to Tip-Ring) is set at -2dB ...
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... MH88634 Absolute Maximum Ratings* Parameters 1 DC Supply Voltages 2 DC Ring Relay Voltage 3 Storage Temperature * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. Recommended Operating Conditions Parameters 1 DC Supply Voltages 2 DC Ring Relay Voltage 3 Operating Temperature * Exceeding these values may cause permanent damage ...
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... Min Typ Max Z 600 THL 4.0 0.95 THD 1.0 1 PSRR MH88634 Units Test Conditions V rms Hz Dummy ringer is 17K in series with 330nF. Type A ringing mA @ 20mA mA @ 1000Vac Vdc LRC = 0v mA LRC = 5V Vdc LRC = 0v mA LRC = 5V Units Test Conditions dB 200-3400 Hz dB 200Hz 1000Hz 3.4kHz ...
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... See Figure 5 for Protection Circuit Electro Mechanical 2 form A. 2-258 2.10 + 0.040 (53.3 + 1.0) 0.56 Max (14.2 Max) * 0.05 + 0.01 (1.3 + 0.5) * 0.05 + 0.02 0.020 + 0.005 (1.225 + 0.05) Figure 3 - Mechanical Data MH88634 Tip Ring LRD K1 VRLY RV LRC XLA RL K1 SHK XLB XLC K1 XLD AGND ...
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... F1, F2 are 1 AMP 250 VAC Slow-blow fuse e.g. Littlefuse 230 2AG 2) R1, 22.4W, 5% 1/2W, 100V Flame Rated resistor e.g., Allen Bradley EB24G5-L05 3) RV1 250 VAC 351 Metal Oxide Varistor e.g. OHIZUMI, 025ONC 12D RV1 RV3 RV2 Figure 5 - External Application Circuit MH88634 MH88634 TIP RING AGND 2-259 ...
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... MH88634 Notes: 2-260 Preliminary Information ...