DS26401 datasheet(68/309 Pages) DALLAS

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DS26401 Octal T1/E1/J1 Framer

8.9.3 T1 Frames Out-of-Sync Count Register (FOSCR)

The FOSCR is used to count the number of multiframes that the receive synchronizer is out of sync. This number is

useful in ESF applications needing to measure the parameters loss-of-frame count (LOFC) and ESF error events

as described in AT&T publication TR54016. When the FOSCR is operated in this mode, it is not disabled during

receive loss of synchronization (RLOF = 1) conditions. The FOSCR has alternate operating mode whereby it will

count either errors in the Ft framing pattern (in the D4 mode) or errors in the FPS framing pattern (in the ESF

mode). When the FOSCR is operated in this mode, it is disabled during receive loss-of-synchronization (RLOF = 1)

conditions. See Table 8-4 for a detailed description of what the FOSCR is capable of counting.

Table 8-4. T1 Frames Out-of-Sync Counting Arrangements

FRAMING MODE

(RCR1.5)

COUNT MOS OR F–BIT ERRORS

(ERCNT.1)

WHAT IS COUNTED

IN THE FOSCRs

MOS

Number of multiframes out of sync

F-Bit

Errors in the Ft pattern

ESF

MOS

Number of multiframes out of sync

ESF

F-Bit

Errors in the FPS pattern

FOSCR1

Frames Out-of-Sync Count Register 1

054h + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

FOS15

FOS14

FOS13

FOS12

FOS11

FOS10

FOS9

FOS8

Default

Bits 0 to 7 / Frames Out-of-Sync Counter Bits 8 to 15 (FOS8 to FOS15).

FOS15 is the MSB of the 16-bit frames

out-of-sync count.

FOSCR2

Frames Out-of-Sync Count Register 2

055h + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

FOS7

FOS6

FOS5

FOS4

FOS3

FOS2

FOS1

FOS0

Default

Bits 0 to 7 / Frames Out-of-Sync Counter Bits 0 to 7 (FOS0 to FOS7).

FOS0 is the LSB of the 16-bit frames out-

of-sync count.

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