S/UNI®-JET Data Sheet
Released
Figure 8 DS3 PLCP Frame Format
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
P11 Z6
P10 Z5
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
Z4
Z3
Z2
Z1
F1
B1
G1
M2
PLCP
Frame Rate
125 µs
M1
C1
Trailer
Framing
(3 octets)
13 or 14
nibbles
POH
53 octets
The DS3 PLCP frame provides the transmission of 12 ATM cells every 125 µs. The PLCP frame
is nibble aligned to the overhead bits in the DS3 frame; however, there is no relationship between
the start of the PLCP frame and the start of the DS3 M-frame. A trailer is inserted at the end of
each PLCP frame. The number of nibbles inserted (13 or 14) is varied continuously such that the
resulting PLCP frame rate can be locked to an 8 kHz reference.
Figure 9 DS1 PLCP Frame Format
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
Z4
Z3
Z2
Z1
F1
B1
G1
M2
M1
C1
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
ATM Cell
PLCP
Frame Rate
3 ms
Trailer
Framing
POH
53 octets
6 octets
(3 octets)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
262
PMC [ PMC-SIERRA, INC ]
