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XRT75L04D Datasheet(PDF) 9 Page - Exar Corporation

Part # XRT75L04D
Description  FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT75L04D Datasheet(HTML) 9 Page - Exar Corporation

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XRT75L04D
REV. 1.0.1
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
5
45
33
176
12
TPOS_0
TPOS_1
TPOS_2
TPOS_3
I
Transmit Positive Data Input - Channel 0:
Transmit Positive Data Input - Channel 1:
Transmit Positive Data Input - Channel 2:
Transmit Positive Data Input - Channel 3:
By default sampled on the falling edge of TxCLK
41
29
4
16
TTIP_0
TTIP_1
TTIP_2
TTIP_3
O
Transmit TTIP Output - Channel 0:
Transmit TTIP Output - Channel 1:
Transmit TTIP Output - Channel 2:
Transmit TTIP Output - Channel 3:
These pins along with TRING transmit bipolar signals to the line using a 1:1
transformer.
39
27
6
18
TRING_0
TRING_1
TRING_2
TRING_3
O
Transmit Ring Output - Channel 0:
Transmit Ring Output - Channel 1:
Transmit Ring Output - Channel 2:
Transmit Ring Output - Channel 3:
These pins along with TTIP transmit bipolar signals to the line using a 1:1 trans-
former.
50
47
171
174
TxLEV_0
TxLEV_1
TxLEV_2
TxLEV_3
I
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:
Transmit Line Build-Out Enable/Disable Select - Channel 3:
These input pins are used to select the Transmit Line Build-Out circuit of Chan-
nel n.
Setting these pins to "High" disables the Line Build-Out circuit of Channel n. In
this mode, Channel n outputs partially-shaped pulses onto the line via the
TTIP_n and TRing_n output pins.
Setting these pins to "Low" enables the Line Build-Out circuit of Channel n. In
this mode, Channel n outputs shaped pulses onto the line via the TTIP_n and
TRing_n 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 these pins to "1" if the cable length between the Cross-Connect and the
transmit output of Channel is greater than 225 feet.
2. Set these pins to "0" if the cable length between the Cross-Connect and the
transmit output of Channel is less than 225 feet.
These pins are active only if the following two conditions are true:
a. The XRT75L04D is configured to operate in either the DS3 or SONET STS-1
Modes.
b. The XRT75L04D is configured to operate in the Hardware Mode.
NOTES:
1.
These pins are internally pulled down.
2.
If the XRT75L04D is configured in HOST mode, these pins should be
tied to GND.
TRANSMIT INTERFACE
PIN #SIGNAL NAME
TYPE
DESCRIPTION


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