參數(shù)資料
型號： DS21FT42
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù)： 56/145頁
文件大小： 466K
代理商： DS21FT42
DALLAS SEMICONDUCTOR
DS21FF42/DS21FT42
101899
/1236
MULTIFRAMES OUT OF SYNC COUNT REGISTER (MOSCR)
Normally the MOSCR is used to count the number of multiframes that the receive synchronizer is out of sync
(RCR2.0=1). 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 MOSCR is operated in this
mode, it is not disabled during receive loss of synchronization (RLOS=1) conditions. The MOSCR 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 MOSCR is operated in this mode, it is disabled during receive
loss of synchronization (RLOS = 1)conditions. See Table 12-3 for a detailed description of what the MOSCR is
capable of counting.
MOSCR1: MULTIFRAMES OUT OF SYNC COUNT REGISTER 1
(Address = 25 Hex)
MOSCR2: MULTIFRAMES OUT OF SYNC COUNT REGISTER 2
(Address = 27 Hex)
(MSB)
MOS/
FB11
MOS/
FB7
(LSB)
(note 1)
MOS/
FB10
MOS/
FB6
MOS/
FB9
MOS/
FB5
MOS/
FB8
MOS/
FB4
(note 1)
(note 1)
(note 1)
MOSCR1
MOS/
FB3
MOS/
FB2
MOS/
FB1
MOS/
FB0
MOSCR2
SYMBOL
POSITION
NAME AND DESCRIPTION
MOS/FB11
MOSCR1.7
MSB of the 12–Bit Multiframes Out of Sync or F–Bit Error Count
(note #2)
LSB of the 12–Bit Multiframes Out of Sync or F–Bit Error Count
(note #2)
MOS/FB0
MOSCR2.0
NOTES:
1. The lower nibble of the counter at address 25 is used by the Path Code Violation Count Register
2. MOSCR counts either errors in framing bit position (RCR2.0=0) or the number of multiframes out of sync
(RCR2.0=1)
MULTIFRAMES OUT OF SYNC COUNTING ARRANGEMENTS
Table 12-3
FRAMING MODE
(CCR2.3)
COUNT MOS OR F–BIT
ERRORS
(RCR2.0)
MOS
WHAT IS COUNTED
IN THE MOSCRs
D4
number of multiframes out of
sync
errors in the Ft pattern
D4
F–Bit
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