
CN8331/CN8332/CN8333
1.0 Pin Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.1 Pin Assignments
100604B
Conexant
1-7
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.
—
61
61
TAIS1
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, ...)
Looping takes precedence over AIS. 
1 = AIS mode enabled
0 = AIS mode disabled
51
—
51
TAIS/ 
TAIS2
Transmit Ch2 AIS mode 
enable
I
40
40
40
TAIS2/
TAIS3
Transmit Ch3 AIS mode 
enable
I
43
43
43
E3MODE
E3MODE
I
When the pin is set to high, it enables the 
E3 mode on all channels, instead of the 
DS3/STS-1 mode. This also changes the 
pulse shaper to E3 mode and overrides all 
LBO pins. It also changes the 
encoder/decoder from B3ZS mode to HDB3 
mode.
1 = E3 mode
0 = DS3/STS-1 mode
44
72
72
LBO/
LBO1
Transmit line Ch1 
build-out mode
I
Line build-out mode per channel, based on 
the length of cable on the transmit side of 
the cross-connect block. This bit is 
overridden and the pulse shaper is disabled 
(no pulse shaping) if E3MODE =1.
1 = Inserts line build-out into the transmit 
channel. Usually used when the transmit 
cable is less than 350 feet in length.
0 = Line build-out bypassed (not inserted). 
Usually used when the transmit cable is 
greater than 350 feet in length.
—
29
44
LBO2
Transmit line Ch2 
build-out mode
I
—
—
29
LBO3
Transmit line Ch3 
build-out mode
I
Table 1-1.  CN8331/CN8332/CN8333 Pin Definitions 
(3 of 6)
Pin #
Signal Name
Description
I/O/P
Notes
CN8331
CN8332
CN8333
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