XRT75L03DIV View Datasheet(PDF) - Exar Corporation

Part Name

Description

Manufacturer

XRT75L03DIV

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

Exar Corporation 

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XRT75L03D

THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.0

FIGURE 19. LOSS OF SIGNAL DEFINITION FOR E3 AS PER ITU-T G.775

0 dB

-12 dB

-15dB

LOS Signal Must be Cleared

Maximum Cable Loss for E3

-35dB

LOS Signal may be Cleared or Declared

LOS Signal Must be Declared

As defined in ITU-T G.775, an LOS condition is also declared between 10 and 255 UI (or E3 bit periods) after

the actual time the LOS condition has occurred. The LOS condition is cleared within 10 to 255 UI after

restoration of the incoming line signal. Figure 20 shows the LOS declaration and clearance conditions.

FIGURE 20. LOSS OF SIGNAL DEFINITION FOR E3 AS PER ITU-T G.775.

RTIP/

RRing

Actual Occurrence

of LOS Condition

Line Signal

is Restored

10 UI

255 UI

Time Range for

LOS Declaration

10 UI

255 UI

RLOS Output Pin

0 UI

G.775

Compliance

0 UI

Time Range for

LOS Clearance

G.775

Compliance

48

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