XRT73LC00A_08 Datasheet, PDF (57/63 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT

XRT73LC00A
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
To comply with the Isolated DSX/STSX-1 Pulse Template Requirements per Bellcore GR-499-CORE or GR-
253-CORE, either:
1. set this input pin to "1" if the cable length between the Cross-Connect and the transmit output of the
XRT73LC00A is greater than 225 feet or
2. set this input pin to "0" if the cable length between the Cross-Connect and the transmit output of the
XRT73LC00A is less than 225 feet.
NOTE: This option is only available when the XRT73LC00A is operating in the DS3 or STS-1 Mode.
Bit D0 - TXBIN (Transmit Binary Data)
This Read/Write bit-field permits configuring of the Transmitter in the XRT73LC00A to accept an un-encoded
binary data stream via the TPDATA input and converts this data into the appropriate bipolar signal to the line.
Writing a “1” configures the Transmitter to accept a binary data stream via the TPDATA input.
NOTE: The TNDATA input is ignored.
This form of data acceptance is sometimes referred to as Single-Rail mode operation. The Transmitter then
encodes this data into the appropriate line code (e.g., B3ZS or HDB3) prior to its transmission over the line.
Writing a “0” configures the Transmitter to accept data in a Dual-Rail manner (e.g., via both the TPDATA and
TNDATA inputs).
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