CX28331-1X CONEXANT [Conexant Systems, Inc], CX28331-1X Datasheet - Page 28

• Manufacturer Part Number: CX28331-1X
• Description: Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
• Manufacturer: CONEXANT [Conexant Systems, Inc]

1.0 Pin Description
1.1 Pin Assignments
Table 1-2. CX2833i-3x Pin Definitions (5 of 8)
1-18
CX28331-3x CX28332-3x CX28333-3x
71
—
—
—
72
—
—
—
56
—
—
—
57
—
—
—
15
—
—
Pin #
—
93
32
—
—
94
31
—
—
90
35
—
—
89
36
—
—
25
—
5
—
93
71
32
—
94
72
31
—
90
56
35
—
89
57
36
—
15
25
5
Signal Name
RLOOP1
RLOOP2
RLOOP3
LLOOP1
LLOOP2
LLOOP3
RLOOP
REQH1
REQH2
REQH3
LLOOP
TVDD1
TVDD2
TVDD3
REQH
TVDD
XOE1
XOE2
XOE3
XOE
Power/Ground
Conexant
Local loopback
enable Ch1
Local loopback
enable Ch2
Local loopback
enable Ch3
Remote
loopback enable
Ch1
Remote
loopback enable
Ch2
Remote
loopback enable
Ch3
Transmit output
enable Ch1
Transmit output
enable Ch2
Transmit output
enable Ch3
Ch1 Receive
High EQ Gain
Enable
Ch2 Receive
High EQ Gain
Enable
Ch3 Receive
High EQ Gain
Enable
TX power Ch1
TX power Ch2
TX power Ch3
Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
I/O/P
P
P
P
I
I
I
I
I
I
I
I
I
I
I
I
Local loopback enable per channel. The
transmit data is looped back immediately
from the encoder to the decoder in place of
the received data.
1 = local loopback enabled
0 = local loopback disabled
Remote loopback enable per channel. The
receive data, retimed after clock recovery, is
looped back into the AMI generator in place
of the transmit data.
1 = remote loopback enabled
0 = remote loopback disabled
Transmit output enable per channel.
1 = transmit line output driver enabled
0 = transmit output driver set to high
The equalizer in the CX2833i has two gain
settings. The higher gain setting is designed
to optimally equalize a nominally-shaped
(meets the pulse template), pulse-driven
DS3 or STS-1 waveform that is driven
through 0–900 feet of cable.
Square-shaped pulses such as E3 or
DS3-HIGH require less high-frequency gain
and should use the low EQ gain setting.
REQH = 1 high EQ gain (DS3/STS-1 modes)
REQH = 0 low EQ gain (E3/DS3
Square Modes)
Power pins for transmit circuitry per
channel (3.3 V).
impedance state
CX28331/CX28332/CX28333
Notes
100985A