CX28332 Conexant Systems, CX28332 Datasheet - Page 27

• Manufacturer Part Number: CX28332
• Description: (CX28331 - CX28333) Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
• Manufacturer: Conexant Systems

CX28331/CX28332/CX28333
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
Table 1-2. CX2833i-3x Pin Definitions (4 of 8)
100985A
CX28331-3x CX28332-3x CX28333-3x
74
63
—
—
—
53
55
—
—
—
Pin #
74
—
76
49
—
53
—
91
34
—
74
—
76
63
49
53
—
91
55
34
Signal Name
ENDECDIS
E3MODE
TAIS1
TAIS2
TAIS3
LBO1
LBO2
LBO3
TAIS
LBO
Control Signals
Conexant
Encoder/decoder
disable (for all
channels)
Transmit Ch1
AIS mode enable
Transmit Ch2
AIS mode enable
Transmit Ch3
AIS mode enable
E3MODE
Transmit line
Ch1 build-out
mode
Transmit line
Ch2 build-out
mode
Transmit line
Ch3 build-out
mode
Description
I/O/P
—
I
I
I
I
I
I
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.
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.
Looping takes precedence over AIS.
1 = AIS mode enabled
0 = AIS mode disabled
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
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.
(+1, -1, +1, -1, +1, ...)
Notes
1.0 Pin Description
1.1 Pin Assignments
1-17