XRT86VL32IB datasheet(31/174 Pages) EXAR

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XRT86VL32

REV. V1.2.0

DUAL T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION

2-0

FASC [2:0]

R/W

011

Loss of FAS Alignment Defect Declaration Criteria Select [2:0]

These bits permit the user to specify the Loss of FAS Alignment defect

declaration criteria. The following table presents the different FAS

Alignment Algorithms in terms of the number of consecutive erred FAS

patterns within a multiframe that the E1 Receiver Framer will receive

before it declares the “Loss of FAS Alignment” defect conditions

NOTE:

Loss of FAS alignment will force the E1 receive framer to

declare the loss of CAS multiframe alignment and loss of CRC

multiframe alignment.

TABLE 8: FRAMING CONTROL REGISTER (FCR)

HEX ADDRESS: 0Xn10B

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

FASC[2:0]

LOSS OF FAS ALIGNMENT DECLARATION CRITERIA

000

Setting these bits to ‘b000’ is illegal. Do not use

this configuration.

001

1 FAS Alignment pattern

010

2 consecutive FAS Alignment patterns

011

3 consecutive FAS Alignment patterns

100

4 consecutive FAS Alignment patterns

101

5 consecutive FAS Alignment patterns

110

6 consecutive FAS Alignment patterns

111

7 consecutive FAS Alignment patterns

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