CX28331/CX28332/CX28333
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.0 Pin Description
1.1 Pin Assignments
Table 1-1. CX2833i-1x Pin Definitions (3 of 6)
Pin #
Signal Name
CX28331-1x CX28332-1x CX28333-1x
Description
I/O/P
Notes
50
—
—
TCLK Transmit clock Ch1
I Transmit bit clock input for strobing
—
62
62
TCLK1
with transmit data into the CX2833i.
—
39
50
TCLK2 Transmit clock Ch2
I
—
—
39
TCLK3 Transmit clock Ch3
I
52
—
—
RLOS Loss of signal Ch1
O Loss Of Signal (LOS) indication for
—
66
66
RLOS1
each channel, as determined by
insufficient pulse density. Signal
—
35
52
RLOS2 Loss of signal Ch2
O loss detected when RLOS = 1. An
LOS will be asserted when 175 ±75
—
—
35
RLOS3 Loss of signal Ch3
O 0s occur in a row and deasserted
when the pulse density is between
28% and 33% (DS3/STS-1) (i.e., a
1s density).
Control Signals
59
59
59
ENDECDIS Encoder/decoder
I 1 = Dual rail pulse coded data
disable (for all channels)
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
—
—
TAIS Transmit Ch1 AIS mode I Transmission of Alarm Indication
—
61
61
TAIS1 enable
Signal (AIS) for a given channel.
Replace transmit data with AIS
—
40
51
TAIS2 Transmit Ch2 AIS mode I signal. The AMI form of AIS
enable
supported is alternating 1s.
(+1, -1, +1, -1, +1, ...)
—
—
40
TAIS3 Transmit Ch3 AIS mode I Looping takes precedence over AIS.
enable
1 = AIS mode enabled
0 = AIS mode disabled
100985A
Conexant
1-7