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CCR2: COMMON CONTROL REGISTER 2 (Address=1A Hex)
(MSB)
ECUS
VCRFS
SYMBOL
POSITION NAME AND DESCRIPTION
ECUS
CCR2.7
VCRFS
CCR2.6
AAIS
CCR2.5
ARA
CCR2.4
RSERC
CCR2.3
LOTCMC
CCR2.2
RFF
CCR2.1
RFE
CCR2.0
6.3 Automatic Alarm Generation
The device can be programmed to automatically transmit AIS or Remote Alarm. When automatic AIS
generation is enabled (CCR2.5 = 1), the device monitors the receive side framer to determine if any of the
following conditions are present: loss of receive frame synchronization, AIS alarm (all one's) reception,
or loss of receive carrier (or signal). If any one (or more) of the above conditions is present, then the
framer will either force an AIS alarm.
When automatic RAI generation is enabled (CCR2.4 = 1), the framer monitors the receive side to
determine if any of the following conditions are present: loss of receive frame synchronization, AIS alarm
(all one's) reception, or loss of receive carrier (or signal) or if CRC4 multiframe synchronization cannot
be found within 128ms of FAS synchronization (if CRC4 is enabled). If any one (or more) of the above
conditions is present, then the framer will either transmit a RAI alarm.
AAIS
ARA
Error Counter Update Select. See Section 8 for details.
0 = update error counters once a second
1 = update error counters every 62.5 ms (500 frames)
VCR Function Select. See Section 8.1 for details.
0 = count BiPolar Violations (BPVs)
1 = count Code Violations (CVs)
Automatic Transmit AIS Generation.
0 = disabled
1 = enabled
Automatic Remote Alarm Generation.
0 = disabled
1 = enabled
RSER Control.
0 = allow RSER to output data as received under all conditions
1 = force RSER to one under loss of frame alignment conditions
Loss of Transmit Clock Mux Control. Determines whether the transmit
side formatter should switch to the ever present RCLKO if the TCLK
should fail to transition (see Figure 3-1).
0 = do not switch to RCLKO if TCLK stops
1 = switch to RCLKO if TCLK stops
Receive Force Freeze. Freezes receive side signaling at RSIG (and TS16
in RSER if CCR3.3=1); will override Receive Freeze Enable (RFE). See
Section 10.2 for details.
0 = do not force a freeze event
1 = force a freeze event
Receive Freeze Enable. See Section 10.2 for details.
0 = no freezing of receive signaling data will occur
1 = allow freezing of receive signaling data at RSIG (and TS16 in RSER
if CCR3.3 = 1).
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RSERC
LOTCMC
DS21354 & DS21554
(LSB)
RFF
RFE
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