XRT75R03D datasheet(77/134 Pages) EXAR

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XRT75R03D

THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER

REV. 1.0.2

Analog LOS Defect

Declared

R/O

Analog LOS Defect Declared:

This READ-ONLY bit-field indicates whether or not the

Analog LOS (Loss of Signal) detector is declaring the LOS

Defect condition.

For DS3 and STS-1 applications, the Analog LOS Detector

will declare the LOS Defect condition whenever it deter-

mines that the amplitude of the pulses (within the incoming

DS3/STS-1 line signal) drops below a certain Analog LOS

Defect Declaration threshold level.

Conversely, (again for DS3 and STS-1 applications) the

Analog LOS Detector will clear the LOS Defect condition

whenever it determines that the amplitude of the pulses

(within the incoming DS3/STS-1 line signal) has risen

above a certain Analog LOS Defect Clearance threshold

level.

It should be noted that, in order to prevent "chattering"

within the Analog LOS Detector output, there is some built-

in hysteresis between the Analog LOS Defect Declaration

and the Analog LOS Defect Clearance threshold levels.

0 - Indicates that the Analog LOS Detector is NOT declar-

ing the LOS Defect Condition.

1 - Indicates that the Analog LOS Detector is currently

declaring the LOS Defect condition.

NOTES:

LOS Detection (within each channel of the

XRT75R03D) is performed by both an Analog

LOS Detector and a Digital LOS Detector. The

LOS state of a given Channel is simply a WIRED-

OR of the LOS Defect Declare states of these two

detectors.

The current LOS Defect Condition (for the

channel) can be determined by reading out the

contents of Bit 1 (Receive LOS Defect Declared)

within this register.

BIT NUMBER

NAME

TYPE

DEFAULT

VALUE

DESCRIPTION

XRT75R03D Datasheet(PDF) 77 Page - Exar Corporation

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