PM7346 datasheet(95/419 Pages) PMC

95 / 419 page

PM7346 S/UNI-QJET

DATASHEET

PMC-960835

ISSUE 6

SATURN QUAD USER NETWORK INTERFACE FOR J2, E3, T3

PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND ITS CUSTOMERS’ INTERNAL USE 74

The T3-TRAN supports diagnostic modes in which it inserts parity or path parity

errors, F-bit framing errors, M-bit framing errors, invalid X or P-bits, line code

violations, or all-zeros.

User control of each of the overhead bits in the DS3 frame is provided.

Overhead bits may be inserted on a bit-by-bit basis from a user supplied data

stream. An overhead clock (at 526 kHz) and a DS3 overhead alignment output

are provided to allow for control of the user provided stream.

9.14 E3 Transmitter

The E3 Transmitter (E3-TRAN) Block integrates circuitry required to insert the

overhead bits into an E3 bit stream and produce an HDB3-encoded signal. The

E3-TRAN is directly compatible with the G.751 and G.832 framing formats.

The E3-TRAN generates the frame alignment signal and inserts it into the

incoming serial stream based on either the G.751 or G.832 formats and an

alignment pulse applied to it by the SPLT block. All overhead and status bits in

each frame format can be individually controlled by register bits or by the

transmit overhead stream. While in certain framing format modes, the E3-TRAN

generates various overhead bytes according to the following:

In G.832 E3 format, the E3-TRAN:

• inserts the BIP-8 byte calculated over the preceding frame;

• inserts the Trail Trace bytes through the Trail Trace Buffer (TTB) block;

• inserts the FERF bit via a register bit or, optionally, when the E3-FRMR

declares OOF, or when the loss of cell delineation (LCD) defect is declared;

• inserts the FEBE bit, which is set to logic 1 when one or more BIP-8 errors

are detected by the receive framer. If there are no BIP-8 errors indicated by

the E3-FRMR, the E3-TRAN sets the FEBE bit to logic 0;

• inserts the Payload Type bits based on the register value set by the

microprocessor;

• inserts the Tributary Unit multiframe indicator bits either via the TOH overhead

stream or by register bit values set by the microprocessor;

• inserts the Timing Marker bit via a register bit;

PM7346 Folha de dados(PDF) 95 Page - PMC-Sierra, Inc