RCLXT16706FE Intel, RCLXT16706FE Datasheet - Page 114

• Manufacturer Part Number: RCLXT16706FE
• Manufacturer: Intel

Specifications of RCLXT16706FE

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.97V
• Operating Supply Voltage (max): 3.63V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

Intel IXF6048 — 51/155/622/2488 Mbit/s SONET/SDH Cell/Packet Interface
114
Figure 9. STS-1/STM-0 Robust Framing State Machine
Upon frame acquisition, the framer de-scrambles the signal. The standard scrambler defined by the
ITU is (2
R_RSTC).
4.4.1.2.1 Loss of Frame (LOF) Detection
Upon detection of an Out Of Frame condition, no consecutive action is required by the ITU
specifications. The number of Out of Frame events are counted and stored in a 13-bit counter
accessible via register OOF_ECNT.
The Loss Of Frame state machine can be configured via the register LOF_LMN. Three parameters
are programmable (from 1 to 32 frames) in the state machine:
‘M’ is the number of consecutive frames with no Out Of Frame conditions required to reenter a
normal state—this value is the LOF_LMN register bits[9:5] setting plus 1 (in other words, M =
bits[9:5] + 1). ‘N’ is the number of consecutive frames with no Out Of Frame conditions required
to reenter a normal state from a Loss Of Frame state—this value is the LOF_LMN register bits[4:0]
setting plus 1 (in other words, N = bits[4:0] + 1). ‘L’ is the number of nonconsecutive frames with
7
- 1) is implemented. For testing purposes, the descrambler can be disabled (see register
Desynchronization cycle is from Locked In Frame State to Out Of Frame State.
Acquisition cycle is from Out Of frame State to In Frame State.
Transition cycle is from In Frame State to Locked In Frame State.
OOF Alarm is disabled and receive demultiplexer is re-synchronized, according
to the new frame boundary, when entering in the In Frame State.
OOF Alarm is activated and receive demultiplexer keeps its former synchronization
Correct FAS = OC-1 Frame Alignment signal detected : A1A2 bytes = Hex "F628"
Errored FAS = errored OC-1 Frame Alignment Signal (errored receive A1A2 bytes)
Valid NDF = received NDF four bits are coherent: descrambled NDF bits = HEX "6"
Invalid NDF = received NDF four bits are incoherent: descrambled value is different
when entering in the Out Of Frame State.
Check 3 more consecutive
frames with Valid NDF
In Frame
(Norm-NDF), or HEX "9" (NDF), or HEX "F" (AIS).
from the 3 valid ones (see Valid NDF)
ROBUST ALGORITHM FOR STS-1 / STM-0 FRAMING
with correct FAS and Valid NDF
2 Consecutive frames
Received Frame
with Invalid NDF
In Frame
Locked
4 or 5 consecutive frames
with errored FAS
Out Of
Frame
8 consecutive frames
with invalid NDF
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