DS2151 Dallas Semiconducotr, DS2151 Datasheet - Page 24

• Manufacturer Part Number: DS2151
• Description: T1 Single-Chip Transceiver
• Manufacturer: Dallas Semiconducotr

2. PCVCR counts either errors in CRC code words (in the ESF framing mode; CCR2.3=1) or errors in
PATH CODE VIOLATION COUNTING ARRANGEMENTS Table 5-2
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)
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
MULTIFRAMES OUT OF SYNC COUNTING ARRANGEMENTS Table 5-3
MOS/FB11
FRAMING MODE
MOS/FB7
FRAMING MODE
(MSB)
the framing bit position (in the D4 framing mode; CCR2.3=0).
sync (RCR2.0=1).
(CCR2.3)
(CCR2.3)
ESF
ESF
D4
D4
ESF
D4
D4
MOS/FB10
MOS/FB6
MOS/FB11
SYMBOL POSITION NAME AND DESCRIPTION
MOS/FB0
COUNT MOS OR F-BIT
COUNT FS ERRORS?
MOS/FB9
MOS/FB5
ERRORS? (RCR2.0)
MOSCR1.7
MOSCR2.0
(RCR2.1)
don’t care
MOS
MOS
F-Bit
F-Bit
yes
no
MOS/FB8
MOS/FB4
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)
24 of 51
MOS/FB3
(note 1)
errors in the Ft pattern
errors in both the Ft and Fs patterns
errors in the CRC6 code words
number of multiframes out of sync
errors in the Ft pattern
number of multiframes out of sync
errors in the FPS pattern
MOS/FB2
(note 1)
WHAT IS COUNTED
WHAT IS COUNTED
IN THE MOSCRs
IN THE PCVCRs
MOS/FB1
(note 1)
MOS/FB0
(note 1)
(LSB)
MOSCR1
MOSCR2
DS2151Q