CX28331/CX28332/CX28333
1.0 Pin Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.1 Pin Assignments
Table 1-1. CX2833i-1x Pin Definitions (3 of 6)
Pin #
Signal Name
Description
I/O/P
Notes
CX28331-1x CX28332-1x CX28333-1x
50
—
—
—
52
—
—
—
—
62
39
—
—
66
35
—
—
62
50
39
—
66
52
35
TCLK
TCLK1
TCLK2
TCLK3
RLOS
Transmit clock Ch1
I
Transmit bit clock input for strobing
with transmit data into the CX2833i.
Transmit clock Ch2
Transmit clock Ch3
Loss of signal Ch1
I
I
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).
RLOS1
RLOS2
RLOS3
Loss of signal Ch2
Loss of signal Ch3
O
O
Control Signals
59
59
59
ENDECDIS Encoder/decoder
disable (for all channels)
I
1 = Dual rail pulse coded data
format. Input transmit data pins
TPOS, TNRZ, TNEG and NC are
interpreted as TPOS and TNEG
(encoded positive and negative rail
data). Output receive data pins
RPOS and RNRZ, and RNEG and
RLCV are interpreted as RPOS and
RNEG, with RPOS having a positive
pulse in place of every positive AMI
pulse and RNEG having a negative
pulse in place of every negative AMI
pulse.
0 = NRZ format. Transmit data pins
TPOS and TNEG are interpreted as
TNRZ and NC (not connected).
Receive data pins RPOS and RNEG
are interpreted as RNRZ and RLCV.
In this mode, all line code violations
are reported as active high on
RLCV.
51
—
—
—
61
40
—
61
51
TAIS
TAIS1
TAIS2
Transmit Ch1 AIS mode
enable
I
Transmission of Alarm Indication
Signal (AIS) for a given channel.
Replace transmit data with AIS
signal. The AMI form of AIS
supported is alternating 1s.
(+1, -1, +1, -1, +1, ...)
Transmit Ch2 AIS mode
enable
I
I
—
—
40
TAIS3
Transmit Ch3 AIS mode
enable
Looping takes precedence over AIS.
1 = AIS mode enabled
0 = AIS mode disabled
100985A
Conexant
1-7
CONEXANT [ CONEXANT SYSTEMS, INC ]
