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XRT7300IV

E3/DS3/STS-1 LINE INTERFACE UNIT

Exar Corporation 

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PIN DESCRIPTION

PIN DESCRIPTION

PIN #

SYMBOL

1

TXLEV

2

TAOS

3

VDD

4

DMO

5

GND

6

GND

7

GND

8

RTIP

9

RRING

10

VDD

XRT7300

E3/DS3/STS-1 LINE INTERFACE UNIT

REV. 1.1.1

TYPE

I

I

****

O

****

****

****

I

I

****

DESCRIPTION

Transmit Line Build-Out Enable/Disable Select:

This input pin is used to enable or disable the Transmit Line Build-Out circuit in

the XRT7300.

Setting this pin to “High” disables the Line Build-Out circuit. In this mode, the

XRT7300 outputs partially shaped pulses onto the line via the TTIP and TRING

output pins.

Setting this pin to “Low” enables the Line Build-Out circuit. In this mode, the

XRT7300 outputs partially-shaped pulses onto the line via the TTIP and TRING

output pins.

To comply with the isolated DSX-3/STSX-1 Pulse Template Requirements per

Bellcore GR-499-Core or Bellcore GR-253-Core:

1. Set this input pin to a "1" if the cable length between the Cross-Connect and

the transmit output of the XRT7300 is greater than 225 feet.

2. Set this input pin to a "0" if the cable length between the Cross-Connect and

the transmit output of the XRT7300 is less than 225 feet.

This pin is active only if both of the following are true:

(a) The XRT7300 is configured to operate in either the DS3 or SONET STS-1

modes and

(b) The XRT7300 is configured to operate in the Hardware Mode.

NOTE: This pin should be tied to GND if the XRT7300 is to be operated in the

HOST mode.

Transmit All Ones Select:

A “High” on this pin causes a continuous AMI all “1’s” pattern to be transmitted

onto the line. The frequency of this “1’s” pattern is determined by TCLK.

NOTES:

1. This input pin is ignored if the XRT7300 is operating in the HOST Mode.

2. Tie this pin to GND if the XRT7300 is going to be operating in the HOST

Mode.

Transmit Digital Power Supply

Drive Monitor Output:

If no transmitted AMI signal is present on MTIP and MRING input pins for

128±32 TCLK periods, then the DMO pin toggles and remains “High” until the

next AMI signal is detected.

Transmit Digital GND

Analog GND (Substrate)

Receive Analog GND

Receive TIP Input:

This input pin along with RRING is used to receive the line signal from the

Remote DS3/E3/STS-1 Terminal.

Receive RING Input:

This input pin along with RTIP is used to receive the line signal from the Remote

DS3/E3/STS-1 Terminal.

Receive Analog VDD

3

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