PM7347 datasheet(264/341 Pages) PMC

264 / 341 page

S/UNI®-JET Data Sheet

Released

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

264

Document ID: PMC-1990267, Issue 3

Figure 11 E1 PLCP Frame Format

ATM Cell

PLCP

Frame Rate

2.375 ms

53 octets

POH

Framing

(3 octets)

The E1 PLCP frame provides the transmission of 10 ATM cells every 2.375 ms. Thirty of the

thirty-two available E1 channels are used for transporting the PLCP frame. The remaining two

channels are reserved for E1 framing and signaling functions. The PLCP frame is octet aligned to

the channel boundaries in the E1 frame. The PLCP frame is aligned to the 125 µs E1 frame (the

A1 octet of the first row of the PLCP frame is inserted in timeslot 1 of the E1 frame).

13.3.1

PLCP Path Overhead Octet Processing

Table 34 PLCP Overhead Processing

Overhead Field

Transmit Operation

Receive Operation

A1, A2:

Frame Alignment

Pattern

Inserts the PLCP frame alignment

pattern (F628H)

Searches the receive stream for the PLCP

frame alignment pattern. When the pattern has

been detected for two consecutive rows, along

with two valid, and sequential path overhead

identifier octets, the S/UNI-JET declares in-

frame.

Note: The ATM cell boundaries are implicitly

known when the PLCP frame is located, thus

cell delineation is accomplished by locating the

PLCP frame. When errors are detected in both

octets in a single row, or when errors are

detected in two consecutive path overhead

identifier octets, the S/UNI-JET declares an

OOF defect. The LOF defect is an integrated

version of the OOF defect state.

PO-P11:

Path Overhead

Identifier

Inserts the path overhead identifier

codes in accordance with the

PLCP frame alignment. See Table

35.

Identifies the PLCP path overhead bytes by

monitoring the sequence of the POI bytes.

Z1-Z6:

These octets are unused and are

These octets are ignored and are extracted on

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