S/UNI®-JET Data Sheet
Released
Mode of
S/UNI-JET Registers (values in Hexadecimal)
300 302 303 304 308 30C 330 334 338 339 340 341 344 34C 360 361 380 39B
Operation
T1 PLCP
T1 ADM
40
40
40
C0
C0
C0
C0
C0
C0
--
--
--
84
80
01
84
80
01
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
04
04
04
00
00
04
04
00
00
00
External Framer
--
004 04
ADM2
Notes
1. In framer only modes, TGAPCLK and RGAPCLK are enabled by programming Register 301H to 30CH.
2. Byte, nibble, or bit alignment of the ATM Cell bytes to the line overhead is configured using the TOCTA
bit in Register 300H, and the FORM[1:0] bits in Register 30CH.
3. Unipolar mode is selected for DS3, E3, and J2 modes by setting the TUNI bit to logic one in Register
302H and the UNI bit in 330H, 338H, and 344H respectively. When the DS3, E3, or J2 framers are
bypassed, unipolar mode is selected by default.
4. Bit, Nibble, and Byte alignment of the ATM cell octets to the arbitrary external frame overhead is set
using the ALIGN[1:0] bits of Register 361H.
5. ATM cells are configured to have the Coset Polynomial added to the HCS byte and payload
scrambling/descrambling is enabled.
6. ATM Idle cell header octets H1, H2, H3, and H4 are configured to be 00H 00H 00H 01H respectively.
13.3 PLCP Frame Formats
The S/UNI-JET supports four different PLCP frame formats:
•
•
•
•
DS3 PLCP.
DS1.
G.751 E3.
E1.
The structure of each of these formats is quite similar, and is illustrated in Figure 8 through
Figure 11.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
261
PMC [ PMC-SIERRA, INC ]
