XRT73L03 Datasheet, PDF (34/62 Pages) Exar Corporation – 3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT

XRT73L03 3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.13
áç
PRELIMINARY
.
FIGURE 15. THE BELLCORE GR-253-CORE TRANSMIT OUTPUT PULSE TEMPLATE FOR SONET STS-1 APPLI-
CATIONS
ST S-1 Pulse T em p late
1.2
1
0.8
0.6
Lower Curve
Upper Curve
0.4
0.2
0
-0.2
-1 _{-0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1}
0 _{0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9}
Time, in UI
1 _{1.1 1.2 1.3 1.4}
2.4.1 Enabling the Transmit Line Build-Out Cir- Enable the Transmit Line Build-Out circuit for each
cuit
channel in the XRT73L03 by doing the following:
If the Transmit Line Build-Out Circuit is enabled, the
Transmit Section of Channel(n) of the XRT73L03 out-
puts shaped pulses onto the line via the TTIP(n) and
TRing(n) output pins.
a. Operating in the Hardware Mode
Set the TxLEV(n) input pin to "Low"
b. Operating in the HOST Mode
Set the TxLEV(n) bit-field to "0".
COMMAND REGISTER CR1-(N)
D4
D3
D2
D1
D0
TxOFF(n)
TAOS(n)
TxClkINV(n)
TxLEV(n)
TxBIN(n)
0
X
X
0
X
2.4.2 Disabling the Transmit Line Build-Out Cir-
cuit
If the Transmit Line Build-Out circuit is disabled, the
XRT73L03 outputs partially-shaped pulses onto the
line via the TTIP(n) and TRing(n) output pins.
To disable the Transmit Line Build-Out circuit, do the
following:
a. Operating in the Hardware Mode
Set the TxLEV(n) input pin to "High".
b. Operating in the HOST Mode
Set the TxLEV(n) bit-field to "1" as illustrated below.
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