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CX28333-3X

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

Conexant Systems 

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

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