Rainbow Electronics DS2154 - Manual (Page 18)

DS2154
031197 18/69
SYNC/RESYNC CRITERIA Table 3–1
FRAME OR MULTI-
FRAME LEVEL SYNC CRITERIA RESYNC CRITERIA 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 (RCR1.2=1) the
above criteria 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 8 ms 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 timeslot 16 con-
tains code other than all zeros Two consecutive MF alignment
words received in error G.732
5.2
RCR2: RECEIVE CONTROL REGISTER 2 (Address=11 Hex)
(MSB) (LSB)
Sa8S Sa7S Sa6S Sa5S Sa4S RBCS RESE –
SYMBOL POSITION NAME AND DESCRIPTION
Sa8S RCR2.7 Sa8 Bit Select. Set to one to have RLCLK pulse at the Sa8 bit position; set
to zero to force RLCLK low during Sa8 bit position. See Section 13 for tim-
ing details.
Sa7S RCR2.6 Sa7 Bit Select. Set to one to have RLCLK pulse at the Sa7 bit position; set
to zero to force RLCLK low during Sa7 bit position. See Section 13 for tim-
ing details.
Sa6S RCR2.5 Sa6 Bit Select. Set to one to have RLCLK pulse at the Sa6 bit position; set
to zero to force RLCLK low during Sa6 bit position. See Section 13 for tim-
ing details.
Sa5S RCR2.4 Sa5 Bit Select. Set to one to have RLCLK pulse at the Sa5 bit position; set
to zero to force RLCLK low during Sa5 bit position. See Section 13 for tim-
ing details.
Sa4S RCR2.3 Sa4 Bit Select. Set to one to have RLCLK pulse at the Sa4 bit position; set
to zero to force RLCLK low during Sa4 bit position. See Section 13 for tim-
ing details.
RBCS RCR2.2 Receive Side Backplane Clock Select.
0=if RSYSCLK is 1.544 MHz
1=if RSYSCLK is 2.048 MHz
RESE RCR2.1 Receive Side Elastic Store Enable.
0=elastic store is bypassed
1=elastic store is enabled
– RCR2.0 Not Assigned. Should be set to zero when written.