XRT73LC04A
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
.
F
IGURE
20. T
HE
B
ELLCORE
GR-253-CORE T
RANSMIT
O
UTPUT
P
ULSE
T
EMPLATE FOR
SONET STS-1 A
PPLI
-
CATIONS
ST S-1 Pulse T emplate
1.2
1
0.8
Norm a lize d Am plitude
0.6
Lower Curve
Upper Curve
0.4
0.2
0
-0.2
0
-1
1
2
3
4
5
8
1
6
7
9
1
2
3
1.
9
8
7
5
6
4
3
2
1
0.
0.
0.
0.
0.
0.
0.
0.
0.
1.
1.
-0
.
-0
.
-0
.
-0
.
-0
.
-0
.
-0
.
-0
.
-0
.
Time, in UI
2.4.1 Enabling the Transmit Line Build-Out Cir-
cuit
If the Transmit Line Build-Out Circuit is enabled, then
the Transmit Section of the Channel outputs shaped
pulses onto the line via the TTIP_(n) and TRing_(n)
output pins.
Enable the Transmit Line Build-Out circuit for each
channel by doing the following:
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", as illustrated below.
COMMAND REGISTER, CR1-(n)
D4
TxOFF_(n)
0
D3
TAOS_(n)
X
D2
TxClkINV_(n)
X
D1
TxLEV_(n)
0
D0
Reserved
X
2.4.2 Disabling the Transmit Line Build-Out Cir-
cuit
If the Transmit Line Build-Out circuit is disabled, then
the XRT73LC04A outputs partially shaped pulses on-
to the line via the TTIP_(n) and TRing_(n) output
pins.
Disable the Transmit Line Build-Out circuit by doing
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.
32
1.
4
EXAR [ EXAR CORPORATION ]
