DS26401 datasheet(159/309 Pages) DALLAS

159 / 309 page

DS26401 Octal T1/E1/J1 Framer

159

Table 10-1. E1 Sync/Resync Criteria

FRAME OR

MULTIFRAME

LEVEL

SYNC CRITERIA

RESYNC CRITERIA

ITU SPEC.

FAS

FAS present in frame N and N

+ 2, and FAS not present in

frame N + 1

Three consecutive incorrect

FAS received

Alternate: (RCR1.2 = 1) The

above criteria is met or three

consecutive incorrect bit 2 of

non-FAS received

G.706

4.1.1 and 4.1.2

CRC4

Two valid MF alignment words

found within 8 ms

915 or more CRC4 code words

out of 1000 received in error

G.706

4.2 and 4.3.2

CAS

Valid MF alignment word

found.

Alternate: (RSIGC.4 = 1)

Valid MF alignment word

found and previous time slot

16 contains code other than all

zeros.

Two consecutive MF alignment

words received in error or for a

period of 1 multiframe, all the

bits in time slot 16 are zero.

Alternate: (RSIGC.4 = 1) The

above criteria is met or 1

multiframe is received with all

bits in time slot 16 set to 0.

G.732 5.2

RCR2

Receive Control Register 2

082h + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

—

RLOSA

Default

Bit 0 / Receive Loss of Signal Alternate Criteria (RLOSA).

Defines the criteria for an LOS condition.

0 = LOS declared upon 255 consecutive zeros (125

ms)

1 = LOS declared upon 2048 consecutive zeros (1ms)

Bits 1 to 7/ Unused. Must be set = 0 for proper operation.

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