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Centillion 1200N ATM Switch User Manual 6-3
NTP 297-8103-903
SONET OC3/SDH STM-1 Frame Format
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For public network UNI and private network UNI/NNI
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Physical layer: SONET PMD
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Optical fiber (multi mode/single mode), UTP5
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Line coding: NRZ
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Data rate/line rate: 155.52 Mbps
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Cell rate: 155.52 × 260/270 = 149.76 Mbps
Figure 6-3: SONET OC-3/SDH STM-1 Frame Format
270 Bytes
9 Bytes
A1,A2 :Frame alignment
B1 :BIP-8
B2 :BIP-24
C1 :STM frame identification
D1-D12 :Data communication channel
E1,E2 :Order wire
F1 :User channel
K1 :Change-over control
K2 :Change-over control,AIS/RDI
Z1 :Reserved
Z2 :FEBE
A1
:Bits active in UNI
Path Trace
BIP-8
Path Identifier
Error Report
User Channel
Header Cell Indicator
Reserved
Reserved
Reserved
J1
B3
C2
G1
F2
H4
Z3
Z4
Z5
E1 F1
D1 D2 D3
K1
D4 D5 D6
D7 D8 D9
D10 D11 D12
Z1
B1
A1A1A2A2A2 C1 C1 C1
AU-4 pointer
B2
Z1
B2 B2 K2
Z1 Z2 Z2 Z2 E2
A1