CX28331/CX28332/CX28333
1.0 Pin Description
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
1.1 Pin Assignments
Table 1-2. CX2833i-3x Pin Definitions (4 of 8)
Pin #
Signal Name
Description
I/O/P
Notes
CX28331-3x CX28332-3x CX28333-3x
Control Signals
74
74
74
ENDECDIS Encoder/decoder
disable (for all
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.
channels)
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.
63
—
—
—
76
49
—
76
63
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.
Transmit Ch2
I
(+1, -1, +1, -1, +1, ...)
AIS mode enable
Looping takes precedence over AIS.
1 = AIS mode enabled
0 = AIS mode disabled
—
—
49
53
TAIS3
Transmit Ch3
AIS mode enable
—
53
53
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
55
—
—
LBO
Transmit line
Ch1 build-out
mode
I
I
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.
—
91
91
LBO1
—
34
55
LBO2
Transmit line
Ch2 build-out
mode
1 = Inserts line build-out into the transmit
channel. Usually used when the transmit
cable is less than 350 feet in length.
—
—
34
LBO3
Transmit line
Ch3 build-out
mode
0 = Line build-out bypassed (not inserted).
Usually used when the transmit cable is
greater than 350 feet in length.
100985A
Conexant
1-17
CONEXANT [ CONEXANT SYSTEMS, INC ]
