IBM3009K2672
IBM SONET/SDH Framer
Data Field is Carrying Debounced K2 Byte and New APS Indication Bit
New APS
Indication
Debounced K2 Byte
8
7
6
5
4
3
2
1
0
MSB
LSB
The New APS Indication bit becomes set when three (SONET) or five (SDH) consecutive and equal new val-
ues of K1 and the five MSBs of K2 are received by the SONET/SDH framer. The duration of the New APS
Indication bit being set is for only one frame.
Data Field is Carrying Debounced K3 Byte and New K3 Indication Bit
New K3
Indication
Debounced K3 Byte
8
7
6
5
4
3
2
1
0
MSB
LSB
The New K3 Indication bit becomes set when three consecutive and equal new values of K3 are received by
the SONET/SDH framer. The duration of the New K3 Indication bit being set is for only one frame.
Data Field is Carrying M1 Line REI and RDI
Line RDI
Line REI (i.e., Line FEBE)
8
7
6
5
4
3
2
1
0
MSB
LSB
The Line REI field is set to the number of B2 errors received by the SONET/SDH framer plus those indicated
on the expansion port. The Line RDI bit is generated immediately upon detection of a LOS, LOF, or AIS-L
defect by the SONET/SDH framer. The Line RDI bit will persist for at least twenty frames. The line RDI is
removed within 100 ms from when the SONET/SDH framer detects termination of the defect. The mating
SONET/SDH framer will insert these Line RDI and Line REI into its transmit K2 and transmit M1 byte stream
for the appropriate STM-1/STM-4/4c/STS-3c/STS-12/STS-12c. Again, while RING is set to ‘1’, line FEBE and
RDI are not locally transmitted but are instead communicated to a mating SONET/SDH framer, which will
insert them into its transmit SDH stream.
Data Field is Carrying Path REI and RDI
G1 Path REI (i.e., Path FEBE)
RDI
3
0
1
0
8
7
6
5
4
2
0
MSB
LSB
The G1 path REI field will contain the count of B3 errors received in its corresponding VC-4 or VC-4c. The
Path RDI is generated immediately after detection of the defect(s) that would cause the SONET/SDH framer
to normally transmit the Path RDI. The path RDI is transmitted for a minimum of ten frames. The Path RDI
Operation
ssframer.01
8/27/99
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