Maxim DS21Q55 specifications Frames Out Of Sync Count Register Foscr, ERCNT.1

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Register Name:		PCVCR1
Register Description:		Path Code Violation Count Register 1
Register Address:		44h
Bit #	7	6	5	4	3	2	1	0
Name	PCVC15	PCVC14	PCVC13	PCVC12	PCVC11	PCVC10	PCVC9	PCVC8
Default	0	0	0	0	0	0	0	0

Bits 0 to 7/Path Code Violation Counter Bits 8 to 15 (PCVC8 to PCVC15). PCVC15 is the MSB of the 16-bit path code violation count.

Register Name:	PCVCR2
Register Description:	Path Code Violation Count Register 2
Register Address:	45h

Bit #

Name

Default

7	6	5	4	3	2	1	0
PCVC7	PCVC6	PCVC5	PCVC4	PCVC3	PCVC2	PCVC1	PCVC0
0	0	0	0	0	0	0	0

Bits 0 to 7/Path Code Violation Counter Bits 0 to 7 (PCVC0 to PCVC7). PCVC0 is the LSB of the 16-bit path code violation count.

13.3 Frames Out Of Sync Count Register (FOSCR)

T1 Operation

The FOSCR is used to count the number of multiframes that the receive synchronizer is out of sync. 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 FOSCR is operated in this mode, it is not disabled during receive loss of synchronization (RLOS = 1) conditions. The FOSCR 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 FOSCR is operated in this mode, it is disabled during receive loss of synchronization (RLOS = 1) conditions. See Table 15-4 for a detailed description of what the FOSCR is capable of counting.

T1 FRAMES OUT OF SYNC COUNTING ARRANGEMENTS Table 15-4

FRAMING MODE	COUNT MOS OR F-BIT ERRORS	WHAT IS COUNTED IN THE
(T1RCR1.3)	(ERCNT.1)	FOSCRs
D4	MOS	Number of Multiframes Out of Sync
D4	F-Bit	Errors in the Ft Pattern
ESF	MOS	Number of Multiframes Out of Sync
ESF	F-Bit	Errors in the FPS Pattern

E1 Operation

The FOSCR counts word errors in the frame alignment signal in timeslot 0. This counter is disabled when RLOS is high. FAS errors will not be counted when the framer is searching for FAS alignment and/or synchronization at either the CAS or CRC4 multiframe level. Since the maximum FAS word error count in a one-second period is 4000, this counter cannot saturate.

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