XRT75R03D datasheet(82/134 Pages) EXAR

82 / 134 page

XRT75R03D

REV. 1.0.2

THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER

TxCLKINV

R/W

Transmit Clock Invert Select - Channel_n:

This READ/WRITE bit-field is used to select the edge of

the TxCLK_n input that the Transmit Section of Channel_n

will use to sample the TPDATA_n and TNDATA_n input

pins, as described below.

0 - Configures the Transmit Section (within the correspond-

ing channel) to sample the TPDATA_n and TNDATA_n

input pins upon the falling edge of TxCLK_n.

1 - Configures the Transmit Section (within the correspond-

ing channel) to sample the TPDATA_n and TNDATA_n

input pins upon the rising edge of TxCLK_n.

NOTE:

Whenever

this

configuration

setting

accomplished via the Host Mode, it is done on a

per-channel basis.

0TxLEV

R/W

Transmit Line Build-Out Select - Channel_n:

This READ/WRITE bit-field is used to either enable or dis-

able the Transmit Line Build-Out (e.g., pulse-shaping) cir-

cuit within the corresponding channel. The user should set

this bit-field to either "0" or to "1" based upon the following

guidelines.

0 - If the cable length between the Transmit Output (of the

corresponding Channel) and the DSX-3/STSX-1 location is

225 feet or less.

1 - If the cable length between the Transmit Output (of the

corresponding Channel) and the DSX-3/STSX-1 location is

225 feet or more.

The user must follow these guidelines in order to insure

that the Transmit Section (of Channel_n) will always gener-

ate a DS3 pulse that complies with the Isolated Pulse Tem-

plate requirements per Bellcore GR-499-CORE, or an

STS-1 pulse that complies with the Pulse Template

requirements per Telcordia GR-253-CORE.

NOTE:

This bit-field is ignored if the channel has been

configured to operate in the E3 Mode.

BIT NUMBER

NAME

TYPE

DEFAULT

VALUE

DESCRIPTION

XRT75R03D Datasheet(PDF) 82 Page - Exar Corporation

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