82P2281PFG8 IDT, Integrated Device Technology Inc, 82P2281PFG8 Datasheet - Page 45

• Manufacturer Part Number: 82P2281PFG8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2281PFG8

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

IDT82P2281
a CRC Sub Multi-Frame is matched with ‘0010’ or ‘0011’, the Network
Terminal CRC Error event is generated. This error event is captured by
the TCRCEI bit and is forwarded to the Performance Monitor.
3.8.2.2.1
error will occur. If the NFAS bit position is received as zero, a NFAS error
will occur. Determined by the BIT2C bit, if this bit is ‘0’, 3 consecutive
FAS pattern errors lead to out of Basic frame synchronization; if this bit
is ‘1’, 3 consecutive FAS pattern errors or 3 consecutive NFAS errors
lead to out of Basic frame synchronization. Then if the REFEN bit is ‘1’,
the Frame Processor will start to search for synchronization again. Addi-
tionally, Excessive CRC-4 Error also leads to out of Basic frame syn-
chronization. In this condition, both the REFEN bit being ‘1’ and the
REFCRCE bit being ‘1’ will allow the Frame Processor to search for syn-
chronization again. If the REFEN bit is ‘0’, no error can lead to reframe
except for manually setting. The manual reframe searches from Basic
frame and is executed by a transition from ‘0’ to ‘1’ on the REFR bit. Dur-
ing out of Basic frame synchronization state, the FAS/NFAS Bit/Pattern
Error detection is suspended.
tern position differs from the previous one, the change of frame align-
ment event is generated. This event is captured by the COFAI bit and is
forwarded to the Performance Monitor.
3.8.2.2.2
also cause out of CRC Multi-Frame synchronization. During out of CRC
Multi-Frame synchronization state, the FAS/NFAS Bit/Pattern Error
detection, CRC Multi-Frame Alignment Pattern Error detection, CRC-4
Error detection, Excessive CRC-4 Error detection, Far End Block Error
detection, Continuous RAI & FEBE Error detection, Continuous FEBE
Error detection, NT CRC Error detection and NT FEBE Error detection
are suspended.
3.8.2.2.3
also cause out of CAS Signaling Multi-Frame synchronization.
CAS Signaling Multi-Frame Alignment Pattern Error occurs or all the
contents in TS16 are zeros, it is out of CAS Signaling Multi-Frame syn-
chronization. Then no matter what the value in the REFEN bit is, the
Frame Processor will search for the CAS Signaling Multi-Frame syn-
chronization again only if the Basic frame is in synchronization. During
out of CAS Signaling Multi-Frame synchronization state, the CAS Sig-
naling Multi-Frame Alignment Pattern Error detection is suspended.
Functional Description
10. NT CRC Error (per ETS 300 233): If the 4-bit Sa6 codeword of
Various errors will lead to out of synchronization:
If there is one or more bit errors in a FAS pattern, a FAS pattern
Once resynchronized, if the new-found Basic frame alignment pat-
The conditions introducing out of Basic frame synchronization will
The conditions introducing out of Basic frame synchronization will
In addition, determined by the SMFASC bit and the TS16C bit, if the
Out Of Basic Frame Synchronization
Out Of CRC Multi-Frame Synchronization
Out Of CAS Signaling Multi-Frame Synchronization
45
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
3.8.2.3
3.8.2.3.1
Si[0:1] bits in the TS0 International / National register. The Si[0:1] bits in
the TS0 International / National register are updated on the boundary of
the associated FAS/NFAS frame and are held during out of Basic frame
state.
3.8.2.3.2
extracted to the A bit in the TS0 International / National register. The A
bit in the TS0 International / National register is updated on the bound-
ary of the associated NFAS frame and is held during out of Basic frame
state.
3.8.2.3.3
Sa[4:8] bits in the TS0 International / National register. The Sa[4:8] bits
in the TS0 International / National register are updated on the boundary
of the associated NFAS frame and are held during out of Basic frame.
3.8.2.3.4
the CRC Sub Multi-Frame, refer to Table 18) are extracted to the corre-
sponding SaX Codeword register. Here the ‘X’ is from 4 through 8. The
National Bit codeword extraction will be set to de-bounce if the SaDEB
bit is set to ‘1’. Thus, the SaX Codeword registers are updated if the
received National Bit codeword is the same for 2 consecutive CRC Sub
Multi-Frames. Whether de-bounced or not, a change indication will be
set in the SaXI bit (‘X’ is from 4 through 8) if the corresponding codeword
in the SaX Codeword register differs from the previous one.
Multi-Frame synchronization state.
3.8.2.3.5
bits in the TS16 Spare register. The X[0:2] bits in the TS16 Spare regis-
ter are updated at the first bit of the next CAS Signaling Multi-Frame and
are held during out of CAS Signaling Multi-Frame state.
3.8.2.3.6
Extraction
to Figure 13) are extracted to the Y bit in the TS16 Spare register. The Y
bit in the TS16 Spare register is updated at the first bit of the next CAS
Signaling Multi-Frame and is held during out of CAS Signaling Multi-
Frame state.
3.8.2.3.7
(MSB is the first received bit) are compared with 0x888, 0xAAA, 0xCCC,
0xEEE and 0xFFF. When CRC Multi-Frame is synchronized, any 3 con-
secutive 4-bit Sa6 codewords in the CRC Sub Multi-Frame are com-
The International bits (Si bits, refer to Table 18) are extracted to the
The Remote Alarm Indication bit (A bit, refer to Table 18) is
The National bits (Sa bits, refer to Table 18) are extracted to the
The five sets of the National Bit codewords (Sa4[1:4] to Sa8[1:4] in
The value in the SaX Codeword registers is held during out of CRC
The Extra bits (X bits, refer to Figure 13) are extracted to the X[0:2]
The Remote Signaling Multi-Frame Alarm Indication bit (Y bit, refer
When Basic frame is synchronized, any 12 consecutive Sa6 bits
Overhead Extraction
International Bit Extraction
Remote Alarm Indication Bit Extraction
National Bit Extraction
National Bit Codeword Extraction
Extra Bit Extraction
Remote Signaling Multi-Frame Alarm Indication Bit
Sa6 Code Detection Per ETS 300 233
August 20, 2009