XRT79L71IB datasheet(55/109 Pages) EXAR

55 / 109 page

XRT79L71

REV. 1.0.0

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

P10

MTIP

Transmit Drive Monitor Input pin - Positive Polarity Input:

This input pin along with MRING functions as the Transmit Drive Monitor Output

(DMO) input monitoring pins.

If the user wishes to (1) monitor the Transmit Output line signal and (2) to perform

this monitoring externally, then the user MUST connect this particular pin to the

TTIP output pin via a 274 ohm series resistor. Similarly, the user MUST also con-

nect the MRING input pin to the TRING output pin via a 274 ohm series resistor.

The MTIP and MRING input pins will continuously monitor the Transmit Output

line signal via the TTIP and TRING 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 DMO output pin "High" in order to denote a possible fault con-

dition in the Transmit Output Line signal path.

NOTES:

This input pin is inactive if the user choose to internally monitor the

Transmit Output line signal.

Internal Monitoring is only available as an option if the user is operating

the XRT79L71 in the Host Mode.

P11

MRING

Transmit Drive Monitor Input pin - Negative Polarity Input:

This input pin along with MTIP functions as the Transmit Drive Monitor Output

(DMO) input monitoring pins.

If the user wishes to (1) monitor the Transmit Output line signal and (2) to perform

this monitoring externally, then the user MUST connect this particular input pin to

the TRING output pin via a 274 ohm series resistor. Similarly, the user MUST also

connect the MTIP input pin to the TTIP output pin via a 274 ohm series resistor.

The MTIP and MRING input pins will continuously monitor the Transmit Output

line signal via the TTIP and TRING 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 DMO output pin "High" in order to denote a possible fault con-

dition in the Transmit Output Line signal path.

NOTES:

This input pin is inactive if the user chooses to internally monitor the

Transmit Output line signal.

Internal Monitoring is only available as an option if the user is operating

the XRT79L71 in the Host Mode.

PIN #

NAME

TYPE

DESCRIPTION

RECEIVE LINE SIDE SIGNALS

R14

RTIP

Receive Input - Positive Polarity Signal:

This input pin, along with the RRING input pin, functions as the Receive DS3/E3

Line Signal input for the XRT79L71.

The user is expected to connect this signal and the RRING input signal to a 1:1

transformer.

Whenever the RTIP/RRING input pins are receiving a positive-polarity pulse

within the incoming DS3 or E3 line signal, this input pin will be pulsed to a higher-

voltage than that of the RRING input pin.

Conversely, whenever the RTIP/RRING input pins are receiving a negative-

polarity pulse within the incoming DS3 or E3 line signal, this input pin will be

pulsed to a lower-voltage than that of the RRING input pin.

PIN #NAME

TYPE

DESCRIPTION

XRT79L71IB Datasheet(PDF) 55 Page - Exar Corporation

XRT79L71IB Datasheet(HTML) 55 Page - Exar Corporation

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