XRT75R03D datasheet(13/134 Pages) EXAR

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XRT75R03D

THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER

REV. 1.0.2

TRANSMIT LINE SIDE PINS

PIN #SIGNAL NAME

TYPE

DESCRIPTION

TTIP_0

TTIP_1

TTIP_2

Transmit TTIP Output - Positive Polarity Signal - Channel 0:

Transmit TTIP Output - Positive Polarity Signal - Channel 1:

Transmit TTIP Output - Positive Polarity Signal - Channel 2:

These output pins along with the corresponding TRING_n output pins, function

as the Transmit DS3/E3/STS-1 Line output signal drivers for a given channel, of

the XRT75R03D.

Connect this signal and the corresponding TRING_n output signal to a 1:1

transformer.

Whenever the Transmit Section of the Channel generates and transmits a posi-

tive-polarity pulse onto the line, this output pin will be pulsed to a "higher-volt-

age" than its corresponding TRING_n output pins.

Conversely, whenever the Transmit Section of the Channel generates and trans-

mit a negative-polarity pulse onto the line, this output pin will be pulsed to a

"lower-voltage" than its corresponding TRING_n output pin.

NOTE: This output pin will be tri-stated whenever the corresponding TxON_n

input pin or bit-field is set to "0".

TRing_0

TRing_1

TRing_2

Transmit Ring Output - Negative Polarity Signal - Channel 0:

Transmit Ring Output - Negative Polarity Signal - Channel 1:

Transmit Ring Output - Negative Polarity Signal - Channel 2:

These output pins along with the corresponding TTIP_n output pins, function as

the Transmit DS3/E3/STS-1 Line output signal drivers for a given channel,

within the XRT75R03D.

Connect this signal and the corresponding TTIP_n output signal to a 1:1 trans-

former.

Whenever the Transmit Section of the Channel generates and transmits a posi-

tive-polarity pulse onto the line. This output pin will be pulsed to a "lower-volt-

age" than its corresponding TTIP_n output pins.

Conversely, whenever the Transmit Section of the Channel generates and trans-

mit a negative-polarity pulse onto the line. This output pin will be pulsed to a

"higher-voltage" than its corresponding TTIP_n output pin.

NOTE: This output pin will be tri-stated whenever the corresponding TxON_n

input pin or bit-field is set to "0".

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