Rainbow Electronics DS2143Q - Manual (Page 14)

DS2143/DS2143Q
031397 14/40
ALARM CRITERIA Table 3
ALARM SET CRITERIA CLEAR CRITERIA
ITU
SPEC.
RSA1
(receive signaling
all ones) over 16 consecutive frames (one full
MF) timeslot 16 contains less than 3
zeros over 16 consecutive frames (one full
MF) timeslot 16 contains 3 or more
zeros G.732
4.2
RSA0
(receive signaling
all zeros) over 16 consecutive frames (one full
MF) timeslot 16 contains all zeros over 16 consecutive frames (one full
MF) timeslot 16 contains at least a
single one G.732
5.2
RDMA
(receive distant
multiframe alarm) bit 6 in timeslot 16 of frame 0 set to
one for two consecutive MF bit 6 in timeslot 16 of frame 0 set to
zero for a two consecutive MF O.162
2.1.5
RUA1
(receive unframed
all ones) less than 3 zeros in two frames (512
bits) more than 2 zeros in two frames (512
bits) O.162
1.6.1.2
RRA
(receive remote
alarm) bit 3 of non–align frame set to one for
3 consecutive occasions bit 3 of non–align frame set to zero for
3 consecutive occasions O.162
2.1.4
RCL
(receive carrier
loss) 255 consecutive zeros received in 255 bit times, at least 32 ones are
received G.775
Note: all the alarm bits in Status Register 1 except the RUA1 will remain set after they are read if the alarm condition
still exists; the RUA1 will clear and check the next 512 bits for an all one’s condition at which point it will again be set if
the alarm condition still is present.
SR2: STATUS REGISTER 2 (Address=07 Hex)
(MSB) (LSB)
RMF RAF TMF SEC TAF LOTC RCMF LORC
SYMBOL POSITION NAME AND DESCRIPTION
RMF SR2.7 Receive CAS Multiframe. Set every 2 ms (regardless if CAS signaling is
enabled or not) on receive multiframe boundaries. Used to alert the host
that signaling data is available.
RAF SR2.6 Receive Align Frame. Set every 250 µ s at the beginning of align frames.
Used to alert the host that Si and Sa bits are available in the RAF and RNAF
registers.
TMF SR2.5 Transmit Multiframe. Set every 2 ms (regardless if CRC4 is enabled) on
transmit multiframe boundaries. Used to alert the host that signaling data
needs to be updated.
SEC SR2.4 One Second Timer. Set on increments of one second based on RCLK.
TAF SR2.3 Transmit Align Frame. Set every 250 µ s at the beginning of align frames.
Used to alert the host that the TAF and TNAF registers need to be updated.