CX28331-3X View Datasheet(PDF) - Conexant Systems

Part Name

Description

Manufacturer

CX28331-3X

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

Conexant Systems 

1.0 Pin Description

1.1 Pin Assignments

CX28331/CX28332/CX28333

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

Table 1-1. CX2833i-1x Pin Definitions (4 of 6)

Pin #

Signal Name

CX28331-1x CX28332-1x CX28333-1x

Description

I/O/P

Notes

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

—

—

LBO Transmit line Ch1

I Line build-out mode per channel,

—

72

72

LBO1

build-out mode

based on the length of cable on the

transmit side of the cross-connect

—

29

44

LBO2 Transmit line Ch2

I block. This bit is overridden and the

build-out mode

pulse shaper is disabled (no pulse

shaping) if E3MODE = 1.

—

—

29

LBO3 Transmit line Ch3

I 1 = Inserts line build-out into the

build-out mode

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.

56

—

—

LLOOP Local loopback enable

I Local loopback enable per channel.

—

74

74

LLOOP1 Ch1

The transmit data is looped back

immediately from the encoder to

—

27

56

LLOOP2 Local loopback enable

I the decoder in place of the received

Ch2

data.

1 = local loopback enabled

—

—

27

LLOOP3 Local loopback enable

I 0 = local loopback disabled

Ch3

57

—

—

RLOOP Remote loopback enable I Remote loopback enable per

—

75

75

RLOOP1 Ch1

channel. The receive data, retimed

after clock recovery, is looped back

—

26

57

RLOOP2 Remote loopback enable I into the AMI generator in place of

Ch2

the transmit data.

1 = remote loopback enabled

—

—

26

RLOOP3 Remote loopback enable I 0 = remote loopback disabled

Ch3

45

—

—

XOE Transmit output enable I Transmit output enable per channel.

—

71

71

XOE1

Ch1

1 = transmit line output driver

enabled

—

30

45

XOE2 Transmit output enable I 0 = transmit output driver set to

Ch2

high impedance state

—

—

30

XOE3 Transmit output enable I

Ch3

1-8

Conexant

100985A

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