DS21Q41BTN Dallas Semiconducotr, DS21Q41BTN Datasheet - Page 31

• Manufacturer Part Number: DS21Q41BTN
• Description: Quad T1 Framer
• Manufacturer: Dallas Semiconducotr

PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address=25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address=26 Hex)
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
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.
(MSB)
CRC/FB7
(note 1)
FRAMING MODE
the framing bit position (in the D4 framing mode; CCR2.3=0).
(CCR2.3)
CRC/FB11
SYMBOL
CRC/FB0
ESF
D4
D4
CRC/FB6
(note 1)
POSITION
PCVCR1.3
PCVCR2.0
CRC/FB5
(note 1)
COUNT Fs ERRORS?
(RCR2.1)
don't care
CRC/FB4
(note 1)
NAME AND DESCRIPTION
MSB of the 12-bit CRC6 error or frame bit error count (note 2)
LSB of the 12-bit CRC6 error or frame bit error count (note 2)
yes
no
CRC/FB11
CRC/FB3
31 of 61
errors in the Ft pattern
errors in both the Ft and Fs patterns
errors in the CRC6 code words
WHAT IS COUNTED IN THE PCVCRs
CRC/FB10
CRC/FB2
CRC/FB9
CRC/FB1
CRC/FB8
CRC/FB0
(LSB)
PCVCR1
PCVCR2
DS21Q41B