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Centillion 1200N ATM Switch User Manual 6-7
NTP 297-8103-903
Figure 6-6: DS3 Frame Format
Figure 6-7: DS3 PLCP Frame Format
...
16-bit 84-bit 680-bit
7 Subframe, each with 680 bits = 1 M-Frame with 4760 bytes
INFO.PYLD.(Information Payload)= 4704 bytes available for the PLCP
Each INFO.PYLD.block = 84 bits
The symbol . . . represents an INFO.PYLD.block
X, Fn
(
where n = 1001
)
, C, P, Mn
(
where n = 010
)
= DS3 Overhead Bit
Subframe
X INFO.PYLD. F1 INFO.PYLD. C CINFO.PYLD. F0 F0 C INFO.PYLD.
P
M1
M0
X
P
INFO.PYLD. F1 INFO.PYLD. C CINFO.PYLD.
F0
F0 C INFO.PYLD.
INFO.PYLD. F1INFO.PYLD. C CINFO.PYLD. F0 F0 C INFO.PYLD.
INFO.PYLD. F1INFO.PYLD. C CINFO.PYLD. F0 F0 C INFO.PYLD.
INFO.PYLD. F1INFO.PYLD. C CINFO.PYLD. F0 F0 C INFO.PYLD.
INFO.PYLD. F1INFO.PYLD. C CINFO.PYLD. F0 F0 C INFO.PYLD.
M0INFO.PYLD. F1INFO.PYLD. C CINFO.PYLD. F0 F0 C INFO.PYLD.
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
A1 A2
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
Z6
Z5
Z4
Z3
Z2
Z1
X
X
X
B1
G1
C1
µ
0
sec
PLCP
Framing
POI POH
First ATM Cell
PLCP Payload
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
Twelfth ATM Cell
53 octets
POI : Path Overhead Indicator
POH : Path Overhead
BIP8 : Bit Interleaved Parity - 8
X : Unassigned