XRT83SL34IV datasheet(51/80 Pages) EXAR

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XRT83SL34

QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

PRELIMINARY

REV. P1.0.8

TABLE 21: MICROPROCESSOR REGISTER #2, BIT DESCRIPTION

0000010

0010010

0100010

0110010

CHANNEL_n

CHANNEL_0

CHANNEL_1

CHANNEL_2

CHANNEL_3

FUNCTION

TYPE

RESET

VALUE

BIT #NAME

INVQRSS_n Invert QRSS Pattern: When TQRSS is active, Writing a “1” to

this bit inverts the polarity of transmitted QRSS pattern. Writing

a “0” sends the QRSS pattern with no inversion.

R/W

TXTEST2_n

Transmit Test Pattern bit 2: This bit together with TXTEST1

and TXTEST0 are used to generate and transmit test patterns

according to the following table:

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

condition when activated enables Quasi-Random Signal

Source generation and detection for the selected channel

number n. In a T1 system QRSS pattern is a 220-1 pseudo-

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

tive zeros. In a E1 system, QRSS is a 215-1 PRBS pattern.

TAOS (Transmit All Ones): Activating this condition enables

the transmission of an All Ones Pattern from the selected

channel number n.

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

condition enables the Network Loop-Up Code of “00001” to be

transmitted to the line for the selected channel number n.

When Network Loop-Up code is being transmitted, the

XRT83SL34 will ignore the Automatic Loop-Code detection

and Remote Loop-Back activation (NLCDE1 =“1”, NLCDE0

=“1”, 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 for the selected channel number n.

R/W

TXTEST1_n

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

function of this bit.

R/W

TXTEST0_n

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

function of this bit.

R/W

No Pattern

TDQRSS

TAOS

TLUC

Test Pattern

TLDC

TXTEST1

TXTEST0

TXTEST2

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