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XRT75R12IB Datasheet(PDF) 8 Page - Exar Corporation |
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XRT75R12IB Datasheet(HTML) 8 Page - Exar Corporation |
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8 / 90 page  XRT75R12 5 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR REV. 1.0.3 C23 AD23 D19 AC19 D15 AC15 E11 AB11 E8 AB8 C4 AD4 MTip0 MTip1 MTip2 MTip3 MTip4 MTip5 MTip6 MTip7 MTip8 MTip9 MTip10 MTip11 I Monitor Tip Input - Positive Polarity Signal These input pins along with MRing_n function as the Transmit Drive Moni- tor Output (DMO) input monitoring pins. (1) To monitor the Transmit Out- put line signal and (2) to perform this monitoring externally, then this pin MUST be connected to the corresponding TTIP_n output pin via a 270 Ω series resistor. Similarly, the MRING_n input pin MUST also be connected to its corresponding TRING_n output pin via a 270 Ω series resistor. The MTIP_n and MRING_n input pins will continuously monitor the Trans- mit Output line signal via the TTIP_n and TRING_n output pins for bipolar activity. If these pins do not detect any bipolar activity for 128 bit periods, then the Transmit Drive Monitor circuit will drive the corresponding DMO_n output pin "High" in order to denote a possible fault condition in the Trans- mit Output Line signal path. NOTE: These input pins are inactive if the user chooses to internally monitor the Transmit Output line signal. D23 AC23 E19 AB19 E16 AB16 D10 AC10 D8 AC8 D4 AC4 MRing0 MRing1 MRing2 MRing3 MRing4 MRing5 MRing6 MRing7 MRing8 MRing9 MRing10 MRing11 I Monitor Ring Input These input pins along with MTIP_n function as the Transmit Drive Monitor Output (DMO) input monitoring pins. (1) To monitor the Transmit Output line signal and (2) to perform this monitoring externally, then this input pin MUST be connected to the corresponding TRING_n output pin via a 270 Ω series resistor. Similarly, the MTIP_n input pin MUST be connected to its corresponding TTIP_n output pin via a 270 Ω series resistor. The MTIP_n and MRING_n input pins will continuously monitor the Trans- mit Output line signal via the TTIP_n and TRING_n output pins for bipolar activity. If these pins do not detect any bipolar activity for 128 bit periods, then the Transmit Drive Monitor circuit will drive the corresponding DMO_n output pin "High" to indicate a possible fault condition in the Transmit Out- put Line signal path. NOTE: These input pins are inactive if the user chooses to internally monitor the Transmit Output line signal. N3 N4 N5 N1 M1 L2 M2 M3 M4 M5 K2 J1 DMO0 DMO1 DMO2 DMO3 DMO4 DMO5 DMO6 DMO7 DMO8 DMO9 DMO10 DMO11 O Drive Monitor Output These output signals are used to indicate a fault condition within the Trans- mit Output signal path. This output pin will toggle "High" anytime the Transmit Drive Monitor cir- cuitry either, via the corresponding MTIP and MRING input pins or inter- nally, detects no bipolar pulses via the Transmit Output line signal (e.g., via the TTIP_m and TRING_m output pins) for 128 bit-periods. This output pin will be driven "Low" anytime the Transmit Drive Monitor cir- cuitry has detected at least one bipolar pulse via the Transmit Output line signal within the last 128 bit periods. SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS PIN #SIGNAL NAME TYPE DESCRIPTION |
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Similar Description - XRT75R12IB |
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