XRT75R12 Datasheet, PDF(8/89 Page) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

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XRT75R12 Datasheet, PDF (8/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

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XRT75R12

REV. P1.0.2

PRELIMINARY

TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR

SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS

PIN #

SIGNAL NAME

TYPE

DESCRIPTION

C23

AD23

D19

AC19

D15

AC15

E11

AB11

AB8

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 Monitor Out-

put (DMO) input monitoring pins. (1) To monitor the Transmit Output line signal

and (2) to perform this monitoring externally, then this pin MUST be connected to

the corresponding TTIP_n output pin via a 270â¦ series resistor. Similarly, the

MRING_n input pin MUST also be connected to its corresponding TRING_n out-

put pin via a 270â¦ series resistor.

The MTIP_n and MRING_n input pins will continuously monitor the Transmit

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 Transmit 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

AC8

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 Out-

put (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 con-

nected to the corresponding TRING_n output pin via a 270â¦ series resistor. Simi-

larly, the MTIP_n input pin MUST be connected to its corresponding TTIP_n

output pin via a 270â¦ series resistor.

The MTIP_n and MRING_n input pins will continuously monitor the Transmit

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 Output Line signal path.

NOTE: These input pins are inactive if the user chooses to internally

monitor the Transmit Output line signal.

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

Transmit 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.

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