XRT83L30_06 Datasheet, PDF(51/78 Page) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L30_06 Datasheet, PDF (51/78 Pages) Exar Corporation – SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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REV. 1.0.1

XRT83L30

SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

TABLE 20: MICROPROCESSOR REGISTER #2 BIT DESCRIPTION

00010

BIT #

NAME

FUNCTION

TYPE VALUE

RXON Receiver ON: Writing a â1â into this bit location turns on the

R/W

Receive Section. Writing a â0â shuts off the Receiver Section. In

this mode, RTIP and RRING driver outputs will be tri-stated for

power reduction or redundancy applications. Default is "0", off.

TXTEST2 Transmit Test Pattern bit 2: This bit together with TXTEST1

R/W

and TXTEST0 are used to generate and transmit test patterns

according to the following table:

TXTEST2 TXTEST1 TXTEST0

Test Pattern

Transmit Data

TAOS

TLUC

TLDC

TDQRSS

TDQRSS & INVQRSS

TDQRSS & INSBER

TDQRSS & INVQRSS & INS

TDQRSS (Transmit/Detect Quasi-Random Signal): This con-

dition, when activated, enables Quasi-Random Signal Source

generation and detection. In a T1 system QRSS pattern is a 220-

1 pseudo-random bit sequence (PRBS) with no more than 14

consecutive zeros. In a E1 system, QRSS is a 215-1 PRBS pat-

tern.

TAOS (Transmit All Ones): Activating this condition enables the

transmission of an All Ones Pattern. TCLK must not be tied

"Low".

TLUC (Transmit Network Loop-Up Code): Activating this con-

dition enables the Network Loop-Up Code of "00001" to be trans-

mitted to the line. When Network Loop-Up code is being

transmitted, the XRT83L30 will ignore the Automatic Loop-Code

detection and Remote Loop-Back activation (NLCDE1 =â1â,

NLCDE0 =â1â, if activated) in order to avoid activating Remote

Digital Loop-Back automatically when the remote terminal

responds to the Loop-Back request.

TLDC (Transmit Network LOOP-Down Code): Activating this

condition enables the network Loop-Down Code of "001" to be

transmitted to the line.

TXTEST1 Transmit Test pattern bit 1: See description of bit D6 for the

R/W

function of this bit.

TXTEST0 Transmit Test Pattern bit 0: See description of bit D6 for the

R/W

function of this bit.

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