PM7347 datasheet(270/341 Pages) PMC

270 / 341 page

S/UNI®-JET Data Sheet

Released

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

270

Document ID: PMC-1990267, Issue 3

Control Bit

Transmit Operation

Receive Operation

Jk: Tributary

Justification Bits

When the device is

configured as a E3 G.751

framer, the Tributary

Justification Bits can be

inserted on the TDATI input

pin the same way as normal

payload data.

When the device is

configured for ATM

application, the Tributary

Justification Bits are used a

payload bits.

Extracts the Tributary Justification Bits on the

ROH output pin when the Jk bits are

configured as overhead.

13.6

G.832 E3 Frame Format

The S/UNI-JET provides support for the G.832 E3 frame format. This format can be extended to

allow for direct byte mapping of ATM cells. The G.832 E3 frame format is shown in Figure 14.

Figure 14 G.832 E3 Frame Structure

FA1

530 octet payload

FA2

59 colum ns

The processing of the overhead bits in the G.832 E3 frame is described in Table 40. In the

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

stream 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 40 G.832 E3 Frame Overhead Operation

Control

Transmit Operation

Receive Operation

FA1, FA2:

Frame Alignment Pattern

Inserts the G.832 E3 frame

alignment pattern (F628H).

Searches the receive stream for the G.832 E3

frame alignment pattern. When the pattern is

detected for two consecutive frames, an in-

frame condition is declared. Note: There is no

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