DS2152
NOTES:
1. The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register.
2. PCVCR counts either errors in CRC code words (in the ESF framing mode; CCR2.3=1) or errors in
the framing bit position (in the D4 framing mode; CCR2.3=0).
PATH CODE VIOLATION COUNTING ARRANGEMENTS Table 5-2
FRAMING MODE
COUNT Fs ERRORS?
WHAT IS COUNTED
IN THE PCVCRs
errors in the Ft pattern
(CCR2.3)
D4
(RCR2.1)
no
D4
ESF
yes
don't care
errors in both the Ft & Fs patterns
errors in the CRC6 code words
5.3 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 5-3 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)
(LSB)
MOS/FB11 MOS/FB10 MOS/FB9 MOS/FB8
(note 1)
(note 1)
(note 1)
(note 1)
MOSCR1
MOSCR2
MOS/FB7
MOS/FB6
MOS/FB5 MOS/FB4 MOS/FB3 MOS/FB2 MOS/FB1 MOS/FB0
SYMBOL
POSITION NAME AND DESCRIPTION
MOS/FB11
MOS/FB0
MOSCR1.7
MOSCR2.0
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)
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).
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DALLAS [ DALLAS SEMICONDUCTOR ]
