PM7347 datasheet(272/341 Pages) PMC

272 / 341 page

S/UNI®-JET Data Sheet

Released

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

272

Document ID: PMC-1990267, Issue 3

Figure 15 J2 Frame Structure

TS1

TS2 TS3 TS4

TS95 TS96 TS97 TS98

TS1

TS2 TS3 TS4

TS95 TS96 TS97 TS98

TS1

TS2 TS3 TS4

TS95 TS96 TS97 TS98

TS1

TS2 TS3 TS4

TS95 TS96 TS97 TS98

125 uS

96 Octets of byte inter-

leaved payload

1-8

9-16

17-24 25-32

752-

760

761-

768

769-

776

777-

784

785

786

787

788

789

Bit #

Fram e 1

Frame 2

Frame 3

Frame 4

The J2 framer decodes a unipolar or B8ZS encoded signal and frames to the resulting 6,312

Kbit/s J2 bit stream. Once in frame, the J2 framer provides indications of frame and multiframe

boundaries and marks overhead bits, x-bits, m-bits and reserved channels (TS97 and TS98).

Indications of LOS, bipolar violations, excessive zeroes, change of frame alignment, framing

errors, and CRC errors are provided and accumulated in internal counters.

The J2 transmitter inserts the overhead bits into a J2 bit stream and produces a B8ZS-encoded

signal. The J2 transmitter adheres to the framing format specified in G.704 and NTT Technical

Reference for High Speed Digital Leased Circuit Services.

The processing of the overhead bits in the J2 frame is described in Table 41. In the transmit

direction, the overhead bits can be inserted on a bit-by-bit basis from a user supplied data using

the TOH, TOHINS, TOHFP, and TOHCLK signals. In the receive direction, the overhead bits are

brought out serially on the ROH data stream.

Table 41 J2 Frame Overhead Operation

Control

Transmit Operation

Receive Operation

TS1-TS96:

Byte Interleaved Payload

Inserts the ATM cells into

TS1 to TS96 octets.

Extracts the ATM cell octet payload and

performs cell delineation.

TS97-TS98:

Signaling channels

Inserts the signaling bytes

from either register bits or

from the TOH and TOHINS

inputs. These bits can be

optionally inserted via TDATI

input when in framer only

mode.

Extracts signaling bytes on the ROH output.

Frame Alignment Signal

Inserts the frame alignment

signal automatically.

Finds J2 frame alignment by searching for the

frame alignment signal.

M-bits:

4kHz Data Link

Inserts the 4 KHz data link

signal from the internal

HDLC controller or from the

bit oriented code generator.

Extracts the 4 KHz data link signal for the

internal HDLC controller.

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