PM7347 datasheet(57/341 Pages) PMC

57 / 341 page

S/UNI®-JET Data Sheet

Released

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

Document ID: PMC-1990267, Issue 3

• The Payload Type bits and buffers them so that they can be read by the microprocessor.

• The Timing Marker bit and asserts the Timing Marker indication when the value of the

extracted bit has been in the same state for three or five consecutive frames.

• The Network Operator byte and presents it as a serial stream for further processing by the

RDLC block when the RNETOP bit in the S/UNI-JET Data Link and FERF Control Register

is logic one. The byte is also brought out on the ROH[x] output with an associated clock on

ROHCLK[x]. All eight bits of the Network Operator byte are extracted and presented on the

overhead output and, optionally, presented to the RDLC.

• The General Purpose Communication Channel byte and presents it to the RDLC when the

RNETOP bit in the S/UNI-JET Data Link and FERF Control Register is logic zero The byte

is also brought out on the ROH[x] output with an associated clock on ROHCLK[x].

In G.751 E3 mode, the E3-FRMR extracts:

• The RAI bit (bit 11 of the frame) and indicates a Remote Alarm when the RAI bit is a logic

one for three or five consecutive frames. Similarly, the Remote Alarm is removed when the

RAI bit is logic zero for three or five consecutive frames.

• The National Use reserved bit (bit 12 of the frame) and presents it as a serial stream for

further processing in the RDLC when the RNETOP bit in the S/UNI-JET Data Link and

FERF Control Register is logic zero. The bit is also brought out on the ROH[x] output with

an associated clock on ROHCLK[x]. Optionally, an interrupt can be generated when the

National Use bit changes state.

Further, while in-frame, the E3-FRMR indicates the position of all the overhead bits in the

incoming digital stream to the ATMF/SPLR block. For G.751 mode, the tributary justification bits

can be optionally identified as either overhead or payload for payload mappings that take

advantage of the full bandwidth.

The E3-FRMR declares OOF alignment if the framing pattern is in error for four consecutive

frames. The E3-FRMR is an "off-line" framer, where all frame alignment indications, all

overhead bit indications, and all overhead bit processing continue based on the previous

alignment. Once the framer has determined the new frame alignment, the OOF indication is

removed and a COFA indication is declared if the new alignment differs from the previous

alignment.

The E3-FRMR detects the presence of AIS in the incoming data stream when less than eight zeros

in a frame are detected while the framer is OOF in G.832 mode, or when less than five zeros in a

frame are detected while OOF in G.751 mode. This algorithm provides a probability of detecting

AIS in the presence of a 10-3 BER as 92.9% in G.832 and 98.0% in G.751.

LOS is declared when no marks have been received for 32 consecutive bit periods. LOS de-

asserted after 32 bit periods during which there is no sequence of four consecutive zeros.

PM7347 データシート(PDF) 57 Page - PMC-Sierra, Inc

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