CX28331 datasheet(27/68 Pages) CONEXANT

27 / 68 page

CX28331/CX28332/CX28333

1.0 Pin Description

Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit

1.1 Pin Assignments

100985A

Conexant

1-17

Control Signals

ENDECDIS

Encoder/decoder

disable (for all

channels)

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.

——

TAIS

Transmit Ch1

AIS mode enable

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

—

TAIS1

—

TAIS2

Transmit Ch2

AIS mode enable

——

TAIS3

Transmit Ch3

AIS mode enable

—

E3MODE

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

——

LBO

Transmit line

Ch1 build-out

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.

—

LBO1

—

LBO2

Transmit line

Ch2 build-out

mode

——

LBO3

Transmit line

Ch3 build-out

mode

Table 1-2. CX2833i-3x Pin Definitions (4 of 8)

Pin #

Signal Name

Description

I/O/P

Notes

CX28331-3x CX28332-3x CX28333-3x

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