XRT7302 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT7302' PDF : 62 Pages View PDF
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PIN DESCRIPTION
PIN #
58
59
SIGNAL NAME
DVDD
TAOS1
60
TxLEV1
61
TxOFF1
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
TYPE
****
I
I
I
DESCRIPTION
Transmit Digital VDD - Channel 1
Transmit All Ones Select - Channel 1:
A “High" on this pin causes the Transmit Section of Channel 1 to generate and
transmit a continuous AMI all “1’s" pattern onto the line. The frequency of this
"1’s" pattern is determined by TxClk1.
NOTES:
1. This input pin is ignored if the XRT7302 is operating in the HOST
Mode.
2. If the XRT7302 is going to be operating in the HOST Mode, this pin
should be tied to GND.
Transmit Line Build-Out Enable/Disable Select - Channel 1:
This input pin is used to enable or disable the Transmit Line Build-Out circuit of
Channel 1.
Setting this pin to "High" disables the Line Build-Out circuit of Channel 1. In
this mode, Channel 1 outputs partially-shaped pulses onto the line via the
TTIP1 and TRing1 output pins.
Setting this pin to "Low" enables the Line Build-Out circuit of Channel 1. In
this mode, Channel 1 outputs shaped pulses onto the line via the TTIP1 and
TRing1 output pins.
To comply with the Isolated DSX-3/STSX-1 Pulse Template Requirements per
Bellcore GR-499-CORE or Bellcore GR-253-CORE:
1. Set this input pin to "1" if the cable length between the Cross-Connect and
the transmit output of Channel 1 is greater than 225 feet.
2. Set this input pin to "0" if the cable length between the Cross-Connect and
the transmit output of Channel 1 is less than 225 feet.
This pin is active only if the following two conditions are true:
a. The XRT7302 is configured to operate in either the DS3 or SONET STS-1
Modes.
b. The XRT7302 is configured to operate in the Hardware Mode.
NOTE: If the XRT7302 is going to be operating in the HOST Mode, this pin
should be tied to GND.
Transmitter OFF Input - Channel 1:
Setting this input pin "High" configures the XRT7302 to turn off the Transmit
Section of Channel 1. In this mode, the TTIP1 and TRing1 outputs is tri-
stated.
NOTES:
1. This input pin controls the TTIP1 and TRing1 outputs even when the
XRT7302 is operating in the HOST Mode.
2. For HOST Mode Operation, tie this pin to GND if the Transmitter is
intended to be turned off via the Microprocessor Serial Interface.
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