1.0 Pin Description
CX28331/CX28332/CX28333
1.1 Pin Assignments
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
Table 1-2. CX2833i-3x Pin Definitions (3 of 8)
Pin #
Signal Name
Description
I/O/P
Notes
CX28331-3x CX28332-3x CX28333-3x
61
—
60
—
—
—
78
—
79
47
—
78
—
79
61
TPOS/
TNRZ
Ch1 transmit
Positive rail or
NRZ data
I
Synchronized transmit data intended to be
strobed in by the corresponding TCLK.
TPOS1/
TNRZ1
When ENDECDIS = 1, these inputs are
expected to be positive and negative AMI
data (TPOS and TNEG).
TNEG/
NC
Ch1 transmit
Negative rail or
no connect data
I
TNEG1/
NC1
When ENDECDIS = 0, these inputs are
expected to be uncoded NRZ data (TNRZ)
and no connects (NC).
TPOS2/
TNRZ2
Ch2 transmit
Positive or NRZ
data
I
I
I
I
I
See notes on the ENDECDIS pin in the
Control Signal section.
—
—
—
46
—
—
60
47
46
TNEG2/
NC2
Ch2 transmit
Negative data or
no connect data
TPOS3/
TNRZ3
Ch3 transmit
Positive or NRZ
data
TNEG3/NC3 Ch3 transmit
Negative data or
no connect data
62
—
—
—
77
48
—
77
62
TCLK
TCLK1
TCLK2
Transmit clock
Ch1
Transmit bit clock input for strobing with
transmit data into the CX2833i.
Transmit clock
Ch2
I
I
—
—
48
TCLK3
Transmit clock
Ch3
67
—
—
—
82
43
—
82
67
RLOS
RLOS1
RLOS2
Loss of signal
Ch1
O
Loss Of Signal (LOS) indication for each
channel, as determined by insufficient pulse
density. Signal loss detected when RLOS =
1. An LOS will be asserted when 175 ±75 0s
occur in a row and deasserted when the
pulse density is between 28% and 33%
(DS3/STS-1) (i.e., a 1s density).
Loss of signal
Ch2
O
O
—
—
43
RLOS3
Loss of signal
Ch3
1-16
Conexant
100985A
CONEXANT [ CONEXANT SYSTEMS, INC ]
