QT2032PRKCB datasheet(39/220 Pages) AMCC

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Revision 5.11

AppliedMicro - Confidential & Proprietary

QT2022/32 - Data Sheet: DS3051

7.1.4 Section Overhead

This layer is responsible for reliable transport of an STS-N frame across the physical medium. Its functions include

framing, scrambling and error monitoring.

7.1.5 Test Pattern Generation

The QT2032 provides WIS compliant test pattern generation features. Please refer to Section 11.5, “WIS Test Fea-

tures (QT2032 only),” on page 102 for details.

Table 11: Section Overhead Definitions

Overhead

Octet

Description

Value (Bits 1...8)

Function

A1, A2

Framing

A1 - 11110110

A2 - 00101000

These bytes are allocated in each STS-1 for framing purposes. A1, A2

bytes are never scrambled.

Section Trace

Varies

This byte is defined only for STS-1 of the STS-192c frame. It is used to

transmit one fixed byte so as to allow a receiving terminal to check its

connection to an intended transmitter. This byte is specified in the

Layer Management block. J0 byte is never scrambled.

Section Growth

11001100

Unsupported, not required by IEEE 802.3 Clause 50.

Section BIP-8

Varies

This byte is used for the section error monitoring function. This is a bit-

interleaved parity 8 code using even parity. It is calculated over all bits

of the previous STS-192c frame after scrambling. When using the

TOH Serial interface, the inserted value of B1 represents an inversion

mask. An inserted value of all zeroes preserves the calculated B1

octet.

Orderwire

00000000

Unsupported, not required by IEEE 802.3 Clause 50.

Section User

Channel

00000000

Unsupported, not required by IEEE 802.3 Clause 50.

D1-D3

Section Data

Communication

channel (DCC)

All octets set to

00000000

Unsupported, not required by IEEE 802.3 Clause 50.

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