PM5313 datasheet(95/646 Pages) PMC

95 / 646 page

PRODUCTION

PMC-Sierra, Inc.

PM5313 SPECTRA-622

DATASHEET

PMC-1981162

ISSUE 6

SONET/SDH PAYLOAD EXTRACTOR/ALIGNER FOR 622 MBIT/S

PROPRIETARY AND CONFIDENTIAL

10.8 Transmit Path Overhead Signals

Pin Name

Type

No.

Function

TPOHCLK

Output

B13

The transmit path overhead clock (TPOHCLK)

provides timing for the path overhead stream.

TPOHCLK is a nominally 12.96 MHz, 50% duty

cycle clock.

TPOH and TPOHEN are sampled on the rising

edge of the TPOHCLK.

TPOHFP is updated on falling edge of TPOHCLK.

TPOHRDY is updated on rising edge of TPOHCLK.

TPOHFP

Output

E14

The path overhead frame position signal

(TPOHFP) may be used to locate the individual

path overhead bits in the overhead data stream,

TPOH. TPOHFP is set high when bit 1 (the most

significant bit) of the Path Trace byte (J1) of the

first STS-1 (STM-0/AU3), STS-3c (STM-1/AU3) or

STS-12c (STM-4-4c) shall be present in the TPOH

stream.

TPOHFP is updated on the falling edge of the

TPOHCLK.

TPOH

Input

C14

The transmit path overhead data signal (TPOH)

contains the path overhead bytes (J1, C2, G1, F2,

Z3, Z4, and Z5) and error mask for the B3 and H4

bytes. The overhead bytes may be inserted into the

path overhead byte positions in the twelve STS-1

(STM-0/AU3) streams or the four STS-3/3c (STM-

1/AU3/AU4) streams or the single STS-12c (STM-

4-4c) stream. The error masks may be used to

insert path BIP and multiframe sequence bit errors

into the outgoing streams.

A path overhead byte is accepted for transmission

when the external source indicates a valid byte

(TPOHEN set high) and the SPECTRA-622

indicates ready (TPOHRDY set high). The

SPECTRA-622 will ignore the byte on TPOH when

TPOHEN is set low. The TPOHRDY is set low to

indicate SPECTRA-622 is not ready, and the byte

must be re-presented at the next opportunity.

TPOH is sampled on the rising edge of the

TPOHCLK output.

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