S/UNI®-JET Data Sheet
Released
Overhead Field
Transmit Operation
Receive Operation
timing reference from REF8KI, a
looptimed 8 kHz reference, or fixed
stuffing via the FIXSTUFF bit in
the SPLT Configuration Register.
See Table 36.
For the G.751 E3 PLCP format,
this octet indicates the number of
stuff octets (17 to 21) at the end of
the PLCP frame. Depending on
the alignment of the G.751 E3
frame to the E3 PLCP frame, 18,
19 or 20 octets are nominally
stuffed.
The stuffing may be varied by ±1
octet so that the PLCP frame rate
can be locked to an external 8 kHz
timing reference from REF8KI. The
S/UNI-JET also supports fixed
timing using the FIXSTUFF bit in
the SPLT Configuration Register.
See Table 37.
Table 35 PLCP Path Overhead Identifier Codes
POI
P11
P10
P9
P8
P7
P6
P5
P4
P3
POI Code (Hex)
2C
29
25
20
1C
19
15
10
0D
08
04
01
P2
P1
P0
Table 36 DS3 PLCP Trailer Length
C1(Hex)
Frame/Trailer Length
1 (13 Nibbles)
2 (14 Nibbles)
3 (13 Nibbles)
3 (14 Nibbles)
FF
00
66
99
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
266
PMC [ PMC-SIERRA, INC ]
