DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
Table 6-1. Alarm Criteria
ALARM
SET CRITERIA
CLEAR CRITERIA
ITU SPEC.
G.732
over 16 consecutive frames over 16 consecutive frames
(one full MF) time slot 16 (one full MF) time slot 16
RSA1
(Receive Signaling All
Ones)
4.2
contains less than three
zeros
contains three or more
zeros
over 16 consecutive frames over 16 consecutive frames
(one full MF) time slot 16 (one full MF) time slot 16
G.732
5.2
RSA0
(Receive Signaling All
Zeros)
contains all zeros
contains at least a single
one
bit 6 in time slot 16 of
frame 0 set to zero for two
consecutive MF
RDMA
(Receive Distant
Multiframe Alarm)
RUA1
bit 6 in time slot 16 of
frame 0 set to one for two
consecutive MF
O.162
2.1.5
less than three zeros in two more than two zeros in two
O.162
(Receive Unframed All
Ones)
frames (512–bits)
frames (512 bits)
1.6.1.2
bit 3 of non-align frame set bit 3 of non-align frame set
O.162
2.1.4
RRA
to one for three
to zero for three
(Receive Remote Alarm)
consecutive occasions
consecutive occasions
RCL
255 (or 2048) consecutive in 255-bit times, at least 32 G.775 / G.962
(Receive Carrier Loss)
zeros received
ones are received
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