XRT83L34_05 Datasheet, PDF(13/99 Page) Exar Corporation – QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L34_05 Datasheet, PDF (13/99 Pages) Exar Corporation – QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83L34

QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR REV. 1.0.1

SIGNAL NAME

TPOS_0/

TDATA_0

TPOS_1/

TDATA_1

TPOS_2/

TDATA_2

TPOS_3/

TDATA_3

PIN #

127

104

101

TYPE

DESCRIPTION

Transmit Positive-Polarity Data Input pin/Transmit Data Input pin:

The exact function of this input pin depends upon whether the XRT83L34

device has been configured to operate in the Single-Rail or Dual-Mode, as

described below.

Dual-Rail Mode Operation - Transmit Positive-Polarity Data Output -

TPOS_n:

For Dual-Rail Applications, the System-Side Terminal Equipment should apply

the "positive-polarity" portion of the outbound DS1/E1 data-stream to this input

pin. Likewise, the System-Side Terminal Equipment should also apply the

"negative-polarity" portion of the outbound DS1/E1 data-stream to the

TNEG_n input pin.

The Transmit Section of Channel n will sample this input pin (along with

TNEG_n) upon the "user-selected" edge of TCLK_n. The Transmit Section of

Channel n will generate a "positive-polarity" pulse (via the outbound DS1/E1

line signal) anytime it samples this input pin at a logic "HIGH" level. The

Transmit Section of Channel n will NOT generate a "positive-polarity" pulse

(via the outbound DS1/E1 line signal) anytime it samples this input pin at a

logic "LOW" level.

Single-Rail Mode Operation - Transmit Data Output - TDATA_n:

For Single-Rail Applications, the System-Side Terminal Equipment should

apply the entire "outbound" DS1/E1 data-stream to this input pin. The Trans-

mit Section of Channel n will sample this input pin upon the "user-selected"

edge of TCLK_n. In the Single-Rail Mode, the internal B8ZS/HDB3 Encoder

will be enabled, and the Transmit Section of the Channel will generate and

transmit "positive" and "negative-polarity" pulses within the outbound DS1/E1

line signal, based upon this "B8ZS/HDB3 Encoder.

NOTE: This pin is internally pulled âLowâ with a 50kâ¦ resistor for each

channels.

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