Rainbow Electronics DS26504 - Manual (Page 46)

DS26504 T1/E1/J1/64KCC BITS Element
46 of 128
Table 9-1. E1 Sync/Resync Criterion
FRAME OR
MULTIFRAME
LEVEL
SYNC CRITERION RESYNC CRITERION ITU SPEC.
FAS FAS present in frame N and
N + 2, and FAS not present in
frame N + 1 Three consecutive incorrect FAS
received
Alternate: (E1RCR.2 = 1) The above
criterion is met or three consecutive
incorrect bit 2 of non-FAS received G.706
4.1.1
4.1.2
CRC4 Two valid MF alignment
words found within 8ms 915 or more CRC4 code words out of
1000 received in error G.706
4.2 and 4.3.2
CAS Valid MF alignment word
found and previous time slot
16 contains code other than
all zeros Two consecutive MF alignment
words received in error G.732 5.2