PM7347 datasheet(71/341 Pages) PMC

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S/UNI®-JET Data Sheet

Released

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

Document ID: PMC-1990267, Issue 3

In G.751 E3 mode, the E3-TRAN :

• Inserts the RAI bit (bit 11 of the frame) either via a register bit or, optionally, when the

E3-FRMR declares OOF.

• Inserts the National Use reserved bit (bit 12 of the frame) either as a fixed value through a

Link and FERF Control Register and the NATUSE bit in the E3 TRAN Configuration

• Optionally identifies the tributary justification bits and stuff opportunity bits as either

overhead or payload to SPLT for payload mappings that take advantage of the full bandwidth.

Further, the E3-TRAN can provide insertion of bit errors in the framing pattern or in the parity

bits, and insertion of single LCV for diagnostic purposes. Most of the overhead bits can be

overwritten by using the TOH[x] and TOHINS[x] input pins.

10.15 J2 Transmitter

The J2 Transmitter (J2-TRAN) Block integrates circuitry required to insert the overhead bits into

an J2 bit stream and produce a B8ZS-encoded signal. The J2-TRAN is directly compatible with

the framing format specified in G.704 and NTT Technical Reference for High-Speed Digital

Leased Circuit Services.

The J2-TRAN generates the frame alignment signal and inserts it into the incoming serial stream.

All overhead and status bits in each frame format can be individually controlled by either register

bits or by the transmit overhead stream.

The J2-TRAN inserts:

• The CRC-5 bits calculated over the preceding multiframe.

• The x-bits through microprocessor programmable register bits.

• The a-bit through a microprocessor programmable register bit.

• The m-bit data link through the TDPR block.

• Payload AIS or physical layer AIS through microprocessor programmable register bits.

• RAI over the m-bits, overwriting HDLC frames, by using the XBOC block or through

automatic activation upon detection of certain remote alarm conditions.

The J2-TRAN allows overwriting of any of the overhead bits by using the TOH[x], TOHINS[x],

TOHFP[x], and TOHCLK[x] overhead signals. Further, the J2-TRAN can provide insertion of

single bit errors in the framing pattern or in the CRC-5 bits, and insertion of single LCV for

diagnostic purposes.

PM7347 データシート(PDF) 71 Page - PMC-Sierra, Inc