XRT73LC04A_08 Datasheet, PDF(58/64 Page) Exar Corporation – 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

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XRT73LC04A_08 Datasheet, PDF (58/64 Pages) Exar Corporation – 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

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XRT73LC04A

4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

REV. 1.0.2

tion. This bit-field is set to "1" if the Channel(n) Digital

LOS Detector is currently declaring an LOS condition.

NOTE: The purpose is to isolate the Detector (e.g., either

the Analog LOS or the Digital LOS detector) that is declar-

ing the LOS condition. This feature may be useful for trou-

bleshooting/debugging purposes.

Bit D0 - DMO_(n) (Drive Monitor Output Status -

Channel(n))

This Read-Only bit-field reflects the status of the

DMO output pin.

5.2.2 Command Register CR1

The bit-format and default values for Command Reg-

ister CR1-(n) are listed below followed by the function

of each of these bit-fields..

COMMAND REGISTER CR1-(n)

Writing a "1" to this bit-field configures the Transmitter

to sample the TPData and TNData input pins on the

rising edge of TxClk. Writing a â0" to this bit-field con-

figures the Transmitter to sample the TPData and

TNData input pins on the falling edge of TxClk.

Bit D1 - TxLEV_(n) (Transmit Line Build-Out En-

able/Disable Select - Channel(n))

This Read/Write bit-field is used to enable or disable

the Channel(n) Transmit Line Build-Out circuit.

Setting this bit-field "High" disables the Channel(n)

Line Build-Out circuit. In this mode, Channel(n) out-

puts partially-shaped pulses onto the line via the

TTIP_(n) and TRing_(n) output pins.

Setting this bit-field "Low" enables the Channel(n)

Line Build-Out circuit. In this mode, Channel(n) out-

puts shaped pulses onto the line via the TTIP_(n) and

TRing_(n) output pins.

TxOFF_(n) TAOS_(n) TxClkINV_(n) TxLEV_(n) Reserved

In order to comply with the Isolated DSX-3/STSX-1

Pulse Template Requiremnts per Bellcore GR-499-

CORE or GR-253-CORE:

Bit D4 - TxOFF_(n) (Transmitter OFF - Channel(n))

This Read/Write bit-field is used to turn off the Chan-

nel(n) Transmitter.

Writing a "1" to this bit field turns off the Transmitter

and tri-state the Transmit Output. Writing a "0" to this

bit-field turns on the Transmitter.

Bit D3 - TAOS_(n) (Transmit All OneS - Chan-

nel(n))

This Read/Write bit-field is used to command the

Channel(n) Transmitter to generate and transmit an

all â1âsâ pattern onto the line.

Writing a "1" to this bit-field commands the Transmit-

ter to transmit an all â1âsâ pattern onto the line. Writ-

ing a "0" to this bit-field commands normal operation.

Bit D2 - TxClkINV_(n) (Transmit Clock Invert -

Channel(n))

This Read/Write bit-field is used to configure the

Transmitter to sample the signal at the TPData and

TNData pins on the rising edge or falling edge of Tx-

Clk (the Transmit Line Clock signal).

a. Set this bit-field to "1" if the cable length between

the Cross-Connect and the transmit output of Chan-

nel(n) is greater than 225 feet.

b. Set this bit-field to "0" if the cable length between

the Cross-Connect and the transmit output of Chan-

nel(n) is less than 225 feet.

This bit-field is active only if the XRT73LC04A is con-

figured to operate in the DS3 or SONET STS-1

Modes.

If the cable length is greater than 225 feet, set this bit-

field to "1" in order to increase the amplitude of the

Transmit Output Signal. If the cable length is less

than 225 feet, set this bit-field to "0".

NOTE: This option is only available when the XRT73LC04A

is operating in the DS3 or STS-1 Mode.

5.2.3 Command Register CR2-(n)

The bit-format and default values for Command Reg-

ister CR2-(n) are listed below followed by the function

of each of these bit fields.

COMMAND REGISTER CR2-(n)

Reserved

ALOSDIS_(n)

DLOSDIS_(n)

REQEN_(n)

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