Rainbow Electronics DS2151Q - Manual (Page 20)

DS2151Q
022697 20/46
PCVCR1: PATH VIOLATION COUNT REGISTER 1 (Address=25 Hex)
PCVCR2: PATH VIOLATION COUNT REGISTER 2 (Address=26 Hex)
(MSB) (LSB)
(note 1) (note 1) (note 1) (note 1) CRC/FB11 CRC/FB10 CRC/FB9 CRC/FB8
CRC/FB7 CRC/FB6 CRC/FB5 CRC/FB4 CRC/FB3 CRC/FB2 CRC/FB1 CRC/FB0
SYMBOL POSITION NAME AND DESCRIPTION
CRC/FB11 PCVCR1.3 MSB of the 12–Bit CRC6 Error or Frame Bit Error Count (note 2)
CRC/FB0 PCVCR2.0 LSB of the 12–Bit CRC6 Error or Frame Bit Error Count (note 2)
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 fram-
ing bit position (in the D4 framing mode; CCR2.3=0).
PATH CODE VIOLATION COUNTING ARRANGEMENTS Table 5–2
FRAMING MODE
(CCR2.3)
COUNT FS
ERRORS? (RCR2.1) WHAT IS COUNTED IN THE PCVCRs
D4 no errors in the Ft pattern
D4 yes errors in both the Ft and Fs patterns
ESF don’t care 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 oper-
ated 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 dis-
abled 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)
MOS/FB7 MOS/FB6 MOS/FB5 MOS/FB4 MOS/FB3 MOS/FB2 MOS/FB1 MOS/FB0
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)
MOS/FB0 MOSCR2.0 LSB of the 12–Bit Multiframes Out of Sync or F–Bit Error Count (note 2)
PCVCR1
PCVCR2
MOSCR1
MOSCR2