XRT75R03 datasheet(9/92 Pages) EXAR

9 / 92 page

XRT75R03

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

REV. 1.0.7

TAOS_0

TAOS_1

TAOS_2

Transmit "All Ones" Input - Channel 0:

Transmit "All Ones" Input - Channel 1:

Transmit "All Ones" Input - Channel 2:

These input pin are used to configure the Transmit Section of the corre-

sponding channel to generate and transmit an unframed "All Ones" pattern

via the DS3, E3 or STS-1 line signal to the remote terminal equipment.

When this configuration is implemented the Transmit Section will ignore the

data that it is accepting from the System-side equipment and will overwrite

this data will the "All Ones" Pattern.

"Low" - Does not configure the channel to transmit an unframed "All Ones"

Pattern to the remote terminal equipment. In this mode, the Transmit Sec-

tion of the Channel will output data based upon the signals that are applied

to the TxPOS_n and TxNEG_n input pins.

"High" - Configures the Channel to transmit an unframed "All Ones" Pattern

to the remote terminal equipment. In this mode, the Transmit Section will

override the data that is applied to the TxPOS_n and TxNEG_n input pins,

and will proceed to generate and transmit an unframed "All Ones" pattern.

NOTES:

This input pin is ignored if the XRT75R03 is operating in the HOST

Mode and should be tied to GND.

These input pins are internally pulled down.

TxLEV_0

TxLEV_1

TxLEV_2

Transmit Line Build-Out Enable/Disable Select - Channel 0:

Transmit Line Build-Out Enable/Disable Select - Channel 1:

Transmit Line Build-Out Enable/Disable Select - Channel 2:

These input pins are used to enable or disable the Transmit Line Build-Out

(e.g., pulse-shaping) circuit within the corresponding channel. The user

should set these input pins either "High" or "Low" based upon the following

guidelines.

"Low" - If the cable length between the Transmit Output of the correspond-

ing Channel and the DSX-3/STSX-1 location is 225 feet or less.

"High" - If the cable length between the Transmit Output of the correspond-

ing Channel and the DSX-3/STSX-1 location is 225 feet or more.

NOTES:

These guidelines must be followed in order to insure that the

Transmit Section of Channel_n will always generate a DS3 pulse

that complies with the Isolated Pulse Template requirements per

Bellcore GR-499-CORE, or an STS-1 pulse that complies with the

Pulse Template requirements per Telcordia GR-253-CORE.

This input pin is inactive if the XRT75R03 has been configured to

operate in the Host Mode, or if the corresponding channel has

been configured to operate in the E3 Mode. If either of these

cases are true, then tie this input pin to GND.

These input pins are internally pulled "Low".

SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS

PIN #SIGNAL NAME

TYPE

DESCRIPTION

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