PM7347 datasheet(267/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

267

Document ID: PMC-1990267, Issue 3

Table 37 E3 PLCP Trailer Length

C1(Hex)

Trailer Length

17 octets

18 octets

19 octets

20 octets

21 octets

13.4

DS3 Frame Format

The S/UNI-JET supports both M23 and C-bit parity DS3 framing formats. This format can be

extended to support direct byte mapping or PLCP mapping of ATM cells. An overview of the DS3

frame format is shown in Figure 12.

Figure 12 DS3 Frame Structure

X1 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

X2 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

P1 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

P2 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

M1 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

M2 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

M3 Payload F1 Payload C1 Payload F2 Payload C2 Payload F3 Payload C3 Payload F4 Payload

680 bits (8 blocks of 84+1 bits)

84 bits

M-subframe

The DS3 receiver decodes a B3ZS-encoded signal and provides indications of LCVs. The B3ZS

decoding algorithm and the LCV definition are software selectable.

While in-frame, the DS3 receiver continuously checks for LCV, M-bit or F-bit framing bit errors,

and P-bit parity errors. When C-bit parity mode is selected, both C-bit parity errors and FEBEs

are accumulated.

When the C-bit parity framing format is detected, both the FEAC channel and the PMDL are

extracted. HDLC messages in the PMDL are received by an internal data link receiver.

The DS3 transmitter allows for the insertion of the overhead bits into a DS3 bit stream and

produces a B3ZS-encoded signal. Status signals such as FERF, AIS, and idle signal can be

inserted when the transmission of these signals is enabled

PM7347 Datasheet(PDF) 267 Page - PMC-Sierra, Inc