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DS2154 Datasheet(PDF) 42 Page - Dallas Semiconductor

Part # DS2154
Description  Enhanced E1 Single Chip Transceiver
PDF  87 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2154 Datasheet(HTML) 42 Page - Dallas Semiconductor

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5.4 FAS Error Counter
FAS Count Register 1 (FASCR1) is the most significant word and FASCR2 is the least significant word
of a 12-bit counter that records word errors in the Frame Alignment Signal in timeslot 0. This counter is
disabled during loss of synchronization conditions, (RLOS = 1). Since the maximum FAS word error
count in a 1-second period is 4000, this counter cannot saturate.
FASCR1: FAS BIT COUNT REGISTER 1 (Address=02 Hex)
FASCR2: FAS BIT COUNT REGISTER 2 (Address=04 Hex)
(MSB)
(LSB)
FAS11
FAS10
FAS9
FAS8
FAS7
FAS6
(note 2)
(note 2)
FASCR1
FAS5
FAS4
FAS3
FAS2
FAS1
FAS0
(note 1)
(note 1)
FASCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
FAS11
FASCR1.7
MSB of the 12-bit FAS error count.
FAS0
FASCR2.2
LSB of the 12-bit FAS error count.
NOTES:
1. The lower 2 bits of FASCR1 at address 02 are the most significant bits of the 10-bit CRC4 error
counter.
2. The lower 2 bits of FASCR2 at address 04 are the most significant bits of the 10-bit E-bit counter.



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