XRT75VL00D datasheet(14/92 Pages) EXAR

14 / 92 page

XRT75VL00D

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

REV. 1.0.3

OPERATING MODE SELECT

PIN #SIGNAL NAME

TYPE

DESCRIPTION

HOST/(HW)I

HOST/Hardware Mode Select:

Tie this pin “High” to configure the XRT75VL00D in HOST mode. Tie this “Low”

to configure in Hardware mode.

When the XRT75VL00D is configured in HOST mode, the states of many dis-

crete input pins are ignored.

NOTE: This pin is internally pulled up.

E3 Mode Select Input

A "High" on this pin configures to operate in the E3 mode.

A "Low" on this pin configures to operate in either STS-1 or DS3 mode depend-

ing on the setting on pin 19.

NOTES:

This pin is internally pulled down

This pin is ignored and may be tied to GND if the XRT75VL00D is

configured to operate in HOST mode.

STS-1/DS3

STS-1/DS3 Select Input

A “High” on this pin configures to operate in STS-1 mode.

A “Low” on this pin configures to operate in DS3 mode.

This pin is ignored if the E3 pin is set to “High”.

NOTES:

This pin is internally pulled down

This pin is ignored and may be tied to GND if the XRT75VL00D is

configured to operate in HOST mode.

SR/DR

Single-Rail/Dual-Rail Select:

Setting this “High” configures both the Transmitter and Receiver to operate in

Single-rail mode and also enables the B3ZS/HDB3 Encoder and Decoder. In

Single-rail mode, Transmit input at TNData should be grounded.

Setting this “Low” configures both the Transmitter and Receiver to operate in

Dual-rail mode and disables the B3ZS/HDB3 Encoder and Decoder.

NOTE: This pin is internally pulled down.

CONTROL AND ALARM INTERFACE

MRING

Monitor Ring Input

The bipolar line output signal from TRING is connected to this pin via a 270

Ω

resistor to check for line driver failure.

NOTE: This pin is internally pulled down.

MTIP

Monitor Tip Input

The bipolar line output signal from TTIP is connected to this pin via a 270-ohm

resistor to check for line driver failure.

NOTE: This pin is internally pulled down.

DMO

Drive Monitor Output

If MTIP and MRING has no transition pulse for 128 ± 32 TxClk cycles, DMO

goes “High” to indictae the driver failure. DMO output stays “High” until the next

AMI signal is detected.

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